{"id":2534,"date":"2026-07-21T15:19:13","date_gmt":"2026-07-21T15:19:13","guid":{"rendered":"https:\/\/www.fhysilicone.com\/?p=2534"},"modified":"2026-07-21T15:20:26","modified_gmt":"2026-07-21T15:20:26","slug":"vedenpitavien-silikonitiivisteiden-suunnittelu-ja-puristustestaus-vuotojen-havaitsemiseksi","status":"publish","type":"post","link":"https:\/\/www.fhysilicone.com\/fi\/waterproof-silicone-seals-design-compression-leak-testing\/","title":{"rendered":"Vedenpit\u00e4v\u00e4t silikonitiivisteet: suunnittelu, puristustestaus ja tiiviystestaus"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vedenpit\u00e4vi\u00e4 silikonitiivisteit\u00e4 k\u00e4ytet\u00e4\u00e4n laajalti elektroniikkakoteloissa, ulkovalaistuksessa, antureissa, akkuj\u00e4rjestelmiss\u00e4, ohjauspaneeleissa, kodinkoneissa, autoteollisuuden komponenteissa, l\u00e4\u00e4ketieteellisiss\u00e4 laitteissa ja teollisissa kokoonpanoissa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vaikka silikoni tarjoaa erinomaista joustavuutta, l\u00e4mm\u00f6nkest\u00e4vyytt\u00e4 ja s\u00e4\u00e4nkest\u00e4vyytt\u00e4, materiaali itsess\u00e4\u00e4n ei takaa vedenpit\u00e4vyytt\u00e4. Luotettava tiivistys riippuu tiivisteprofiilin, uran mittojen, puristustason, kotelon j\u00e4ykkyyden, pinnan viimeistelyn, asennustavan ja validointimenettelyn v\u00e4lisest\u00e4 vuorovaikutuksesta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Teollisuuden ostajien ja hankinta-insin\u00f6\u00f6rien tulisi siksi valita vedenpit\u00e4v\u00e4t tiivistyskomponentit koko k\u00e4ytt\u00f6ymp\u00e4rist\u00f6n perusteella eik\u00e4 pelk\u00e4st\u00e4\u00e4n tiivisteen mittojen tai materiaalin kovuuden perusteella.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00e4ss\u00e4 oppaassa selitet\u00e4\u00e4n t\u00e4rkeimm\u00e4t suunnitteluun, puristukseen, materiaaleihin, valmistukseen ja tiiviystestaukseen liittyv\u00e4t tekij\u00e4t, jotka vaikuttavat r\u00e4\u00e4t\u00e4l\u00f6ityjen vedenpit\u00e4vien silikonitiivisteiden valmistukseen.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/Waterproof-Silicone-Seals-Design-Compression-Leak-Testing-1024x768.png\" alt=\"\" class=\"wp-image-2535\" srcset=\"https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/Waterproof-Silicone-Seals-Design-Compression-Leak-Testing-1024x768.png 1024w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/Waterproof-Silicone-Seals-Design-Compression-Leak-Testing-300x225.png 300w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/Waterproof-Silicone-Seals-Design-Compression-Leak-Testing-768x576.png 768w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/Waterproof-Silicone-Seals-Design-Compression-Leak-Testing-16x12.png 16w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/Waterproof-Silicone-Seals-Design-Compression-Leak-Testing-600x450.png 600w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/07\/Waterproof-Silicone-Seals-Design-Compression-Leak-Testing.png 1448w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Mik\u00e4 on vedenpit\u00e4v\u00e4 silikonitiiviste?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Vedenpit\u00e4v\u00e4 silikonitiiviste on elastomeerinen komponentti, joka est\u00e4\u00e4 veden tai kosteuden tunkeutumisen kahden yhteen liitetyn osan v\u00e4liseen liitoskohtaan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kun silikoni puristetaan asianmukaisesti paikoilleen, se t\u00e4ytt\u00e4\u00e4 pienet raot, ty\u00f6st\u00f6j\u00e4ljet, valuvaihtelut ja pinnan ep\u00e4tasaisuudet. T\u00e4m\u00e4 luo jatkuvan kosketuspaineen tiivisteen ja vastapintojen v\u00e4lille.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yleisi\u00e4 vedenpit\u00e4vi\u00e4 silikonitiivistekomponentteja ovat muun muassa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Silikoniset O-renkaat<\/li>\n\n\n\n<li>Litte\u00e4t silikonitiivisteet<\/li>\n\n\n\n<li>Suorakulmaiset tiivisterenkaat<\/li>\n\n\n\n<li>D-muotoiset tiivisteet<\/li>\n\n\n\n<li>Huulitiivisteet<\/li>\n\n\n\n<li>Ontot silikonitiivisteet<\/li>\n\n\n\n<li>Radiaaliset akselitiivisteet<\/li>\n\n\n\n<li>Liittimien tiivisteet<\/li>\n\n\n\n<li>Kaapelil\u00e4pivientitiivisteet<\/li>\n\n\n\n<li>Nappikalvot<\/li>\n\n\n\n<li>Ylivaletut silikonitiivisteet<\/li>\n\n\n\n<li>R\u00e4\u00e4t\u00e4l\u00f6idyt, muovausmenetelm\u00e4ll\u00e4 valmistetut kotelotiivisteet<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Oikean tiivistysratkaisun valinta riippuu siit\u00e4, altistuuko sovellus sateelle, roiskeille, tilap\u00e4iselle upotukselle, jatkuvalle upotukselle, painepesulle, tiivistymiselle, h\u00f6yrylle vai sis\u00e4iselle nestepaineelle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Vedenkest\u00e4vyys ei tarkoita samaa kaikissa k\u00e4ytt\u00f6tarkoituksissa<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ennen silikonitiivisteen valitsemista ostajan tulisi m\u00e4\u00e4ritell\u00e4 tarkasti, mit\u00e4 \u201cvedenpit\u00e4v\u00e4\u201d tarkoittaa lopputuotteen kannalta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pelk\u00e4st\u00e4\u00e4n sateensuojaksi suunniteltu tiiviste ei v\u00e4ltt\u00e4m\u00e4tt\u00e4 kest\u00e4 upotusta. Tiiviste, joka l\u00e4p\u00e4isee lyhyen ruiskutustestin, voi silti alkaa vuotaa l\u00e4mp\u00f6syklien tai pitk\u00e4aikaisen puristuksen j\u00e4lkeen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00e4rkeit\u00e4 hakuehtoja ovat muun muassa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vesisuihkun suunta<\/li>\n\n\n\n<li>Vedenpaine<\/li>\n\n\n\n<li>Upotussyvyys<\/li>\n\n\n\n<li>Upotuksen kesto<\/li>\n\n\n\n<li>Altistumistiheys<\/li>\n\n\n\n<li>K\u00e4ytt\u00f6l\u00e4mp\u00f6tila<\/li>\n\n\n\n<li>L\u00e4mp\u00f6syklit<\/li>\n\n\n\n<li>Sis\u00e4inen tai ulkoinen paine<\/li>\n\n\n\n<li>Asumisen kehitys<\/li>\n\n\n\n<li>Arvioitu k\u00e4ytt\u00f6ik\u00e4<\/li>\n\n\n\n<li>Puhdistusmenetelm\u00e4t<\/li>\n\n\n\n<li>Kemikaaleille altistuminen<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Vaadittu suojausaste on m\u00e4\u00e4ritett\u00e4v\u00e4 ennen ty\u00f6kalujen valmistuksen aloittamista.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Yleisi\u00e4 vedenpit\u00e4vi\u00e4 silikonitiivisteiden malleja<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Silikoniset O-renkaat<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O-renkaiden poikkileikkaus on py\u00f6re\u00e4, ja ne asennetaan yleens\u00e4 koneistettuihin tai valettuihin uriin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Niit\u00e4 k\u00e4ytet\u00e4\u00e4n usein seuraaviin tarkoituksiin:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Anturikotelot<\/li>\n\n\n\n<li>Putkiliittimet<\/li>\n\n\n\n<li>Venttiilikokoonpanot<\/li>\n\n\n\n<li>Paristokannet<\/li>\n\n\n\n<li>S\u00e4hk\u00f6liittimet<\/li>\n\n\n\n<li>Sylinterim\u00e4iset kotelot<\/li>\n\n\n\n<li>Pumpun osat<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">O-rengas voi muodostaa luotettavan vesitiiviin tiivisteen, kun ura s\u00e4\u00e4telee puristusta ja est\u00e4\u00e4 liiallista liikkumista.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O-renkaat ovat erityisen tehokkaita py\u00f6reiss\u00e4 tai symmetrisiss\u00e4 kokoonpanoissa. Ne voivat kuitenkin kierty\u00e4, kierty\u00e4 sivulle, veny\u00e4 tai siirty\u00e4 paikaltaan, jos ura ja asennusprosessi eiv\u00e4t ole asianmukaisesti suunniteltu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Litte\u00e4t silikonitiivisteet<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Litte\u00e4t silikonitiivisteet puristuvat kahden vastakkain olevan pinnan v\u00e4liin. Niit\u00e4 k\u00e4ytet\u00e4\u00e4n usein suorakulmaisissa kansissa, paneeleissa, luukuissa ja koteloissa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tyypillisi\u00e4 k\u00e4ytt\u00f6kohteita ovat:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ulkok\u00e4ytt\u00f6\u00f6n tarkoitetut s\u00e4hk\u00f6kotelot<\/li>\n\n\n\n<li>Teollisuuden ohjauspaneelit<\/li>\n\n\n\n<li>Valaistuskotelot<\/li>\n\n\n\n<li>Kodinkoneiden suojukset<\/li>\n\n\n\n<li>Tarkastusikkunat<\/li>\n\n\n\n<li>Laitteiden ovet<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Litte\u00e4t tiivisteet tarjoavat laajan tiivistyspinnan ja sopivat ep\u00e4s\u00e4\u00e4nn\u00f6llisen muotoisiin koteloihin. Kiinnikkeiden sijainnit ja kiristysvoima on kuitenkin jaettava tasaisesti.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Jos ruuvien v\u00e4linen et\u00e4isyys on liian suuri, kotelo voi taipua kiinnityskohtien v\u00e4lill\u00e4 ja aiheuttaa paikallisia vuotokohtia.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Suorakulmaiset ja neli\u00f6m\u00e4iset tiivisteet<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Suorakulmaiset profiilit tarjoavat laajan ja vakaan kosketuspinnan, eiv\u00e4tk\u00e4 ne py\u00f6ri niin helposti asennuksen aikana.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e4it\u00e4 tiivisteit\u00e4 voidaan k\u00e4ytt\u00e4\u00e4 seuraaviin tarkoituksiin:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pinnalliset urat<\/li>\n\n\n\n<li>Suuret suojakotelot<\/li>\n\n\n\n<li>Muovikotelot<\/li>\n\n\n\n<li>Staattiset teolliset kokoonpanot<\/li>\n\n\n\n<li>Osat, joiden sijoittelu on s\u00e4\u00e4dett\u00e4v\u00e4<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Rakenteen tulisi tarjota riitt\u00e4v\u00e4sti tilaa materiaalin sivuttaiselle laajenemiselle puristuksen aikana.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">D-muotoiset tiivisteet<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">D-muotoisissa tiivisteiss\u00e4 on tasainen kiinnityspinta ja kaareva puristuspinta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Niit\u00e4 k\u00e4ytet\u00e4\u00e4n yleisesti seuraaviin tarkoituksiin:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Huoltoluukut<\/li>\n\n\n\n<li>Laitekaapit<\/li>\n\n\n\n<li>Ulkok\u00e4ytt\u00f6\u00f6n tarkoitetut kotelot<\/li>\n\n\n\n<li>Ajoneuvojen suojakotelot<\/li>\n\n\n\n<li>Suojakannet<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tasainen pohja auttaa vakauttamaan tiivistett\u00e4, kun taas py\u00f6ristetty yl\u00e4pinta mahdollistaa hallitun muodonmuutoksen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D-muotoiset tiivisteet voidaan valmistaa suljettuina renkaina tai puristetuista profiileista, joiden liitoskohdat on liimattu yhteen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Huulitiivisteet<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Huulitiivisteess\u00e4 k\u00e4ytet\u00e4\u00e4n yht\u00e4 tai useampaa ohutta, joustavaa reunaa tiivistekosketuksen yll\u00e4pit\u00e4miseksi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Huulitiivisteet ovat hy\u00f6dyllisi\u00e4, kun:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Asennusvoiman on pysytt\u00e4v\u00e4 alhaisena<\/li>\n\n\n\n<li>Liitospinta liikkuu<\/li>\n\n\n\n<li>Tarvitaan s\u00e4teitt\u00e4inen tiivistys<\/li>\n\n\n\n<li>Tarvitaan toinen p\u00f6lyeste<\/li>\n\n\n\n<li>Asunnossa on rajoitetusti tilaa<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tiivistysreunaa on suojattava taittumiselta, repeytymiselt\u00e4 tai liialliselta puristukselta asennuksen aikana.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ontot silikonitiivisteet<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ontot silikoniprofiilit puristuvat helpommin kasaan kuin umpitiivisteet. Niit\u00e4 k\u00e4ytet\u00e4\u00e4n usein silloin, kun tarvitaan suurta tiivistett\u00e4, mutta kotelo ei kest\u00e4 suurta puristusvoimaa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tyypillisi\u00e4 k\u00e4ytt\u00f6kohteita ovat:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suurten laitteiden ovet<\/li>\n\n\n\n<li>Ohut muovisuojus<\/li>\n\n\n\n<li>Lasipaneelit<\/li>\n\n\n\n<li>Kevyet kotelot<\/li>\n\n\n\n<li>Paristokotelon kannet<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Onteloa, sein\u00e4m\u00e4n paksuutta, kulmien muotoa ja liitoksen lujuutta on valvottava huolellisesti.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ylivaletut vedenpit\u00e4v\u00e4t tiivisteet<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Silikonia voidaan valaa suoraan muovin, metallin, kaapelin, liittimen tai elektroniikkakomponenttien p\u00e4\u00e4lle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ylivalaminen voi v\u00e4hent\u00e4\u00e4 kokoonpanovaiheita ja poistaa erillisen tiivisteen asennuksen tarpeen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yleisi\u00e4 esimerkkej\u00e4 ovat:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vedenpit\u00e4v\u00e4t kaapeliliittimet<\/li>\n\n\n\n<li>Anturikotelot<\/li>\n\n\n\n<li>S\u00e4hk\u00f6iset painikkeet<\/li>\n\n\n\n<li>Kaapelil\u00e4pivientikomponentit<\/li>\n\n\n\n<li>Muovikannet, joissa on integroidut tiivisteet<\/li>\n\n\n\n<li>Metalliset insertit, joissa on silikoniset tiivistyspinnat<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Suunnittelussa on otettava huomioon tarttuvuus, alustan esik\u00e4sittely, materiaalien yhteensopivuus, alaleikkaukset, mekaaniset lukitusominaisuudet sek\u00e4 muovausl\u00e4mp\u00f6tila.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Silikonimateriaalin valinta<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Silikonimateriaalit eroavat toisistaan kovuuden, rep\u00e4isylujuuden, puristusmuodonmuutoksen, kemiallisen kest\u00e4vyyden, kovettumistavan, puhtauden ja s\u00e4\u00e4ntelytilanteen suhteen.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Yleisk\u00e4ytt\u00f6inen silikoni<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yleisk\u00e4ytt\u00f6inen silikoni sopii moniin ulko- ja teollisuuden vedenpit\u00e4vyysk\u00e4ytt\u00f6tarkoituksiin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Se kest\u00e4\u00e4 hyvin:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vesi<\/li>\n\n\n\n<li>Otsoni<\/li>\n\n\n\n<li>Ultraviolettis\u00e4teilylle altistuminen<\/li>\n\n\n\n<li>S\u00e4\u00e4n vaikutukset<\/li>\n\n\n\n<li>Korkeat ja matalat l\u00e4mp\u00f6tilat<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Sit\u00e4 k\u00e4ytet\u00e4\u00e4n yleisesti valaistuksessa, s\u00e4hk\u00f6laitteiden koteloissa, kodinkoneissa ja yleisiss\u00e4 laitteissa.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Nestem\u00e4inen silikonikumi<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Nestem\u00e4inen silikonikumi, eli LSR, soveltuu tarkkuusruiskuvaluun ja suurten tuotantom\u00e4\u00e4rien valmistukseen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Etuihin kuuluvat:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Yhdenmukaiset mitat<\/li>\n\n\n\n<li>Aineiden tasainen sekoittuminen<\/li>\n\n\n\n<li>Monimutkainen tiivistysgeometria<\/li>\n\n\n\n<li>Ohut tiivistysreuna<\/li>\n\n\n\n<li>Automaattinen muovaus<\/li>\n\n\n\n<li>V\u00e4h\u00e4isen v\u00e4l\u00e4hdyksen ty\u00f6kalut<\/li>\n\n\n\n<li>Muovin tai metallin p\u00e4\u00e4llyspuristus<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">LSR:\u00e4\u00e4 k\u00e4ytet\u00e4\u00e4n usein liittimiss\u00e4, antureissa, l\u00e4\u00e4kinn\u00e4llisiss\u00e4 laitteissa, elektroniikkakomponenteissa ja tarkkuusluokan vesitiiviiss\u00e4 tiivisteiss\u00e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Eritt\u00e4in tihe\u00e4 kumi<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Korkean konsistenssin kumia, jota kutsutaan my\u00f6s nimell\u00e4 HCR, voidaan valmistaa puristusvalulla, siirtovalulla tai suulakepuristuksella.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Se sopii:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suuret tiivisteet<\/li>\n\n\n\n<li>Paksut tiivisterenkaat<\/li>\n\n\n\n<li>Suulakepuristetut ovitiivisteet<\/li>\n\n\n\n<li>Pienet ja keskisuuret hankkeet<\/li>\n\n\n\n<li>R\u00e4\u00e4t\u00e4l\u00f6idyt profiilitiivisteet<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Paras valmistusmenetelm\u00e4 riippuu osan koosta, toleranssista, vuosituotantom\u00e4\u00e4r\u00e4st\u00e4 ja profiilin monimutkaisuudesta.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fluorisilikoni<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Fluorisilikoni tarjoaa paremman kest\u00e4vyyden tiettyj\u00e4 polttoaineita, \u00f6ljyj\u00e4 ja liuottimia vastaan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vedenpit\u00e4vi\u00e4 tiivisteit\u00e4 saatetaan tarvita seuraavissa k\u00e4ytt\u00f6kohteissa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Autoteollisuuden j\u00e4rjestelm\u00e4t<\/li>\n\n\n\n<li>Ilmailu- ja avaruusteollisuuden laitteet<\/li>\n\n\n\n<li>Polttoaineeseen liittyv\u00e4t kokoonpanot<\/li>\n\n\n\n<li>\u00d6ljylle altistuvat teollisuuskomponentit<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Fluorisilikoni on kuitenkin yleens\u00e4 kalliimpaa kuin tavallinen silikoni.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Elintarvikek\u00e4ytt\u00f6\u00f6n tarkoitettu tai l\u00e4\u00e4ketieteellinen silikoni<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Elintarvikkeisiin, juomaveteen tai l\u00e4\u00e4kinn\u00e4llisiin laitteisiin liittyv\u00e4t sovellukset saattavat edellytt\u00e4\u00e4 tarkasti m\u00e4\u00e4riteltyj\u00e4 ainesosakoostumuksia ja niit\u00e4 tukevaa dokumentaatiota.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ostajan tulee ilmoittaa seuraavat tiedot:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suunnitellut k\u00e4ytt\u00f6olosuhteet<\/li>\n\n\n\n<li>Sovellettavat s\u00e4\u00e4nn\u00f6kset<\/li>\n\n\n\n<li>Sterilointimenetelm\u00e4<\/li>\n\n\n\n<li>V\u00e4rirajoitukset<\/li>\n\n\n\n<li>Puhtausvaatimukset<\/li>\n\n\n\n<li>J\u00e4ljitett\u00e4vyysvaatimukset<\/li>\n\n\n\n<li>Vaaditut testiraportit<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Yleinen kuvaus, kuten \u201celintarvikek\u00e4ytt\u00f6\u00f6n sopiva\u201d tai \u201cl\u00e4\u00e4ketieteelliseen k\u00e4ytt\u00f6\u00f6n sopiva\u201d, ei riit\u00e4 ilman, ett\u00e4 m\u00e4\u00e4ritell\u00e4\u00e4n sovellettava standardi ja k\u00e4ytt\u00f6olosuhteet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Miten silikonin kovuus vaikuttaa vedeneristykseen<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Silikonin kovuus mitataan yleens\u00e4 Shore A -asteikolla.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tyypillisiss\u00e4 vedenpit\u00e4viss\u00e4 tiivistysratkaisuissa k\u00e4ytet\u00e4\u00e4n yleens\u00e4 materiaaleja, joiden kovuus on noin 30\u201370 Shore A, vaikka erityissovelluksiin voidaan valita my\u00f6s pehme\u00e4mpi\u00e4 tai kovempia materiaaleja.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pehme\u00e4mpi silikoni<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Pehme\u00e4mpi silikoni mukautuu helpommin ep\u00e4tasaisiin tai joustamattomiin liitospintoihin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mahdollisia etuja ovat muun muassa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pienempi asennusvoima<\/li>\n\n\n\n<li>Parempi vaatimustenmukaisuus<\/li>\n\n\n\n<li>Parempi tiivistys kuvioiduilla pinnoilla<\/li>\n\n\n\n<li>Suurempi suvaitsevaisuus asuinolojen vaihtelua kohtaan<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Mahdollisia haittoja ovat muun muassa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suurempi puristumisriski<\/li>\n\n\n\n<li>Suurempi asennuksen v\u00e4\u00e4ristym\u00e4<\/li>\n\n\n\n<li>Alhaisempi ulottuvuuksien vakaus<\/li>\n\n\n\n<li>Lis\u00e4\u00e4ntynyt ylikompressioriski<\/li>\n\n\n\n<li>Vaikeampi automatisoitu k\u00e4sittely<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Kovempi silikoni<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Kovempi silikoni s\u00e4ilytt\u00e4\u00e4 muotonsa paremmin ja sit\u00e4 voi olla helpompi asettaa paikoilleen kokoonpanon aikana.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mahdollisia etuja ovat muun muassa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Parannettu mittavakaus<\/li>\n\n\n\n<li>Parempi puristuskest\u00e4vyys<\/li>\n\n\n\n<li>Helpompi automaattinen asennus<\/li>\n\n\n\n<li>Tarkemmin hallittu geometria<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Mahdollisia haittoja ovat muun muassa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suurempi kiristysvoima<\/li>\n\n\n\n<li>V\u00e4hennetty vaatimustenmukaisuus<\/li>\n\n\n\n<li>Suurempi herkkyys asunnon tasaisuudelle<\/li>\n\n\n\n<li>Vuoto, jos puristus on riitt\u00e4m\u00e4t\u00f6n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Kovuutta ei tule valita erikseen. Se on arvioitava yhdess\u00e4 tiivisteen profiilin ja puristustavoitteen kanssa.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tiivisteen puristumisen ymm\u00e4rt\u00e4minen<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Puristus on yksi t\u00e4rkeimmist\u00e4 tekij\u00f6ist\u00e4 vedenpit\u00e4v\u00e4n tiivisteen suunnittelussa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kun kotelo on koottu, tiivisteen on oltava riitt\u00e4v\u00e4n tiukasti puristettuna, jotta koko tiivistyspinnalle muodostuu tasainen kosketuspaine.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Riitt\u00e4m\u00e4t\u00f6n puristus<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Riitt\u00e4m\u00e4t\u00f6n puristus voi aiheuttaa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Paikalliset aukot<\/li>\n\n\n\n<li>Alhainen tiivistyspaine<\/li>\n\n\n\n<li>Veteen meneminen<\/li>\n\n\n\n<li>P\u00f6lyn tunkeutuminen<\/li>\n\n\n\n<li>Tiivisteen liike<\/li>\n\n\n\n<li>Vuoto t\u00e4rin\u00e4n j\u00e4lkeen<\/li>\n\n\n\n<li>Vika l\u00e4mp\u00f6syklin aikana<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Liiallinen pakkaus<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Liiallinen puristus voi aiheuttaa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suuri kokoonpanovoima<\/li>\n\n\n\n<li>Pysyv\u00e4 muodonmuutos<\/li>\n\n\n\n<li>Asuntomarkkinoiden v\u00e4\u00e4ristym\u00e4t<\/li>\n\n\n\n<li>Tiivisteen suulakepuristus<\/li>\n\n\n\n<li>Nopeutettu puristumaj\u00e4\u00e4m\u00e4<\/li>\n\n\n\n<li>Repeytyminen kokoonpanon aikana<\/li>\n\n\n\n<li>Lyhentynyt k\u00e4ytt\u00f6ik\u00e4<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ihanteellinen pakkausprosentti riippuu seuraavista tekij\u00f6ist\u00e4:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tiivisteen profiili<\/li>\n\n\n\n<li>Materiaalin kovuus<\/li>\n\n\n\n<li>Staattinen vai dynaaminen sovellus<\/li>\n\n\n\n<li>Groove-t\u00e4yte<\/li>\n\n\n\n<li>L\u00e4mp\u00f6tila<\/li>\n\n\n\n<li>Paine<\/li>\n\n\n\n<li>Pinnan kunto<\/li>\n\n\n\n<li>Asuntomarkkinoiden joustamattomuus<\/li>\n\n\n\n<li>Asennustoleranssi<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Suunnittelun alkuvaiheessa voidaan k\u00e4ytt\u00e4\u00e4 kohtuullista alustavaa puristustavoitetta, mutta lopulliset arvot on vahvistettava todellisten muovattujen osien ja koteloiden avulla.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Urajen suunnitteluun liittyv\u00e4t seikat<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ura s\u00e4\u00e4telee silikonitiivisteen asentoa, puristumista ja venymist\u00e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Oikein suunnitellun uran tulisi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pid\u00e4 tiiviste paikallaan<\/li>\n\n\n\n<li>Est\u00e4 v\u00e4\u00e4ntyminen tai kiertyminen<\/li>\n\n\n\n<li>Salli sivusuuntainen laajeneminen<\/li>\n\n\n\n<li>Pakkauksen hallinta<\/li>\n\n\n\n<li>Asennuksessa aiheutuvien vaurioiden minimointi<\/li>\n\n\n\n<li>Pid\u00e4 tiivistyspaine tasaisena<\/li>\n\n\n\n<li>Est\u00e4 liiallinen puristuminen<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00e4rkeit\u00e4 uran mittoja ovat muun muassa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Uran leveys<\/li>\n\n\n\n<li>Uran syvyys<\/li>\n\n\n\n<li>Kulman s\u00e4de<\/li>\n\n\n\n<li>Aukon viiste<\/li>\n\n\n\n<li>Pinnan viimeistely<\/li>\n\n\n\n<li>Jakolinjan sijainti<\/li>\n\n\n\n<li>Paineistuksen pys\u00e4ytys<\/li>\n\n\n\n<li>Vapaa tila<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tiivisteen ei tule t\u00e4ytt\u00e4\u00e4 uraa kokonaan. Silikonilla on oltava tilaa muotoutua osien asennuksen yhteydess\u00e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ter\u00e4vi\u00e4 uran kulmia tulisi yleens\u00e4 v\u00e4ltt\u00e4\u00e4, koska ne voivat vahingoittaa tiivistett\u00e4 tai aiheuttaa j\u00e4nnityskeskittymi\u00e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kotelon tasaisuus ja j\u00e4ykkyys<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Jopa oikein suunniteltu tiiviste voi vuotaa, jos kotelo v\u00e4\u00e4ntyy tai liitospinnat eiv\u00e4t ole tasaiset.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00e4m\u00e4 ongelma on yleist\u00e4 seuraavissa tilanteissa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suuret muovisuojukset<\/li>\n\n\n\n<li>Ohutmetallilevyt<\/li>\n\n\n\n<li>Pitk\u00e4t suorakulmaiset kotelot<\/li>\n\n\n\n<li>Kotelot, joissa ruuvien v\u00e4li on suuri<\/li>\n\n\n\n<li>Komponentit, jotka on asennettu ep\u00e4tasaisella kiristysmomentilla<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Insin\u00f6\u00f6rien tulisi arvioida seuraavia seikkoja:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Asunnon sein\u00e4n paksuus<\/li>\n\n\n\n<li>Kylkiluiden rakenne<\/li>\n\n\n\n<li>Kiinnikkeiden v\u00e4li<\/li>\n\n\n\n<li>Ruuvin kiristysmomentti<\/li>\n\n\n\n<li>Kannen taipuma<\/li>\n\n\n\n<li>Pinnan tasaisuus<\/li>\n\n\n\n<li>Muovausj\u00e4lkeinen v\u00e4\u00e4ntyminen<\/li>\n\n\n\n<li>L\u00e4mp\u00f6laajeneminen<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Puristuksen lis\u00e4\u00e4minen ei aina ratkaise kotelon muodonmuutosta. Liian suuri tiivistevoima voi jopa pahentaa muodonmuutosta.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kiinnittimen sijainti ja asennusvoima<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tasomaisten tiivisteiden kohdalla kiinnikkeiden sijoitus vaikuttaa suoraan tiivistyspaineeseen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If screws are placed only at the corners, the center of a long edge may lift and create a leakage path.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The assembly should provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Even fastener spacing<\/li>\n\n\n\n<li>Controlled torque<\/li>\n\n\n\n<li>Adequate housing stiffness<\/li>\n\n\n\n<li>Compression stops where necessary<\/li>\n\n\n\n<li>Consistent clamping pressure<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Compression stops are rigid features that limit how far the housing can close. They can help prevent gasket over-compression and improve assembly consistency.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Surface Finish and Sealing Interfaces<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The mating surface should be smooth enough to prevent continuous leak channels.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Potential problems include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Deep machining marks<\/li>\n\n\n\n<li>Sink marks<\/li>\n\n\n\n<li>Parting lines<\/li>\n\n\n\n<li>Ejector-pin marks<\/li>\n\n\n\n<li>Scratches<\/li>\n\n\n\n<li>Flash<\/li>\n\n\n\n<li>Weld lines<\/li>\n\n\n\n<li>Surface contamination<\/li>\n\n\n\n<li>Housing warpage<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The seal should not cross an uncontrolled parting line, sharp edge, or deep surface defect.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For critical applications, the drawing should identify the sealing surface and its required finish.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Corners and Joint Areas<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Corners are common failure locations in rectangular waterproof gaskets.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Problems may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Seal thinning<\/li>\n\n\n\n<li>Incomplete filling<\/li>\n\n\n\n<li>Uneven compression<\/li>\n\n\n\n<li>Material folding<\/li>\n\n\n\n<li>Stress concentration<\/li>\n\n\n\n<li>Bonded-joint weakness<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Molded closed-loop gaskets generally provide better corner consistency than cut-and-bonded extruded profiles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When an extruded gasket is joined into a ring, the buyer should specify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Joint position<\/li>\n\n\n\n<li>Joint strength<\/li>\n\n\n\n<li>Maximum mismatch<\/li>\n\n\n\n<li>Joint appearance<\/li>\n\n\n\n<li>Leak-test requirements<\/li>\n\n\n\n<li>Minimum cross-sectional consistency<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Compression Set and Long-Term Performance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Compression set describes the permanent deformation remaining after silicone has been compressed for a defined time and temperature.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A seal with poor compression-set performance may gradually lose contact pressure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is especially important in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Outdoor equipment<\/li>\n\n\n\n<li>Hot enclosures<\/li>\n\n\n\n<li>Autoteollisuuden j\u00e4rjestelm\u00e4t<\/li>\n\n\n\n<li>Battery assemblies<\/li>\n\n\n\n<li>Lighting products<\/li>\n\n\n\n<li>Long-life industrial equipment<\/li>\n\n\n\n<li>Products that are rarely serviced<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The material should be tested under conditions that reflect the real operating temperature and compression level.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Room-temperature test data alone may not predict long-term sealing performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thermal Cycling<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Silicone, plastic, metal, and glass expand and contract at different rates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">During temperature cycling, these dimensional changes can alter gasket compression and housing flatness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A seal may pass an initial leak test but fail after repeated heating and cooling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thermal cycling evaluation should consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Minimum temperature<\/li>\n\n\n\n<li>Maximum temperature<\/li>\n\n\n\n<li>Heating rate<\/li>\n\n\n\n<li>Cooling rate<\/li>\n\n\n\n<li>Number of cycles<\/li>\n\n\n\n<li>Dwell time<\/li>\n\n\n\n<li>Assembly condition<\/li>\n\n\n\n<li>Sis\u00e4inen paine<\/li>\n\n\n\n<li>Moisture exposure<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Leak testing after thermal cycling is often more meaningful than testing only newly assembled parts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Waterproof Seal Leak-Testing Methods<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There is no single leak test suitable for every application. The test method should match the actual risk and product specification.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Visual Water Spray Testing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The assembly is exposed to water spray from specified directions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This method is suitable for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rain-resistant housings<\/li>\n\n\n\n<li>Outdoor products<\/li>\n\n\n\n<li>General splash protection<\/li>\n\n\n\n<li>Early prototype evaluation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">After testing, the enclosure is opened and inspected for water entry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The procedure should control:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spray pressure<\/li>\n\n\n\n<li>Nozzle distance<\/li>\n\n\n\n<li>Spray angle<\/li>\n\n\n\n<li>Duration<\/li>\n\n\n\n<li>Product orientation<\/li>\n\n\n\n<li>Water temperature<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Immersion Testing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The assembled product is submerged in water for a specified depth and time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Immersion testing is appropriate for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Waterproof sensors<\/li>\n\n\n\n<li>Battery housings<\/li>\n\n\n\n<li>Submersible equipment<\/li>\n\n\n\n<li>Portable electronics<\/li>\n\n\n\n<li>Sealed connectors<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The test specification should define:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Water depth<\/li>\n\n\n\n<li>Exposure duration<\/li>\n\n\n\n<li>Product orientation<\/li>\n\n\n\n<li>Water temperature<\/li>\n\n\n\n<li>Internal pressure condition<\/li>\n\n\n\n<li>Acceptance criteria<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Air-Pressure Decay Testing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The sealed assembly is pressurized with air. The system then measures the pressure decrease over time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Etuihin kuuluvat:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clean testing<\/li>\n\n\n\n<li>Fast production inspection<\/li>\n\n\n\n<li>Quantitative results<\/li>\n\n\n\n<li>Easy automation<\/li>\n\n\n\n<li>No need to dry the product<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However, pressure-decay results can be influenced by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Internal volume<\/li>\n\n\n\n<li>Temperature change<\/li>\n\n\n\n<li>Flexible housing expansion<\/li>\n\n\n\n<li>Fixture leakage<\/li>\n\n\n\n<li>Stabilization time<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The test limits must be developed using known good and known leaking samples.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Vacuum Decay Testing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Vacuum decay testing removes air from a test chamber or component and measures pressure changes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It can detect small leaks and may be suitable for sensitive components.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fixture design and test-volume stability are important for repeatability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bubble Leak Testing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The component is pressurized and submerged in water. Escaping air produces visible bubbles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This method is useful for locating leak positions during development.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is simple but may be less suitable for automated production testing or very small leaks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tracer-Gas Testing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A tracer gas such as helium may be used for highly sensitive leak detection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This method is generally reserved for applications requiring very low allowable leak rates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It may be used in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Medical systems<\/li>\n\n\n\n<li>High-reliability electronics<\/li>\n\n\n\n<li>Aerospace components<\/li>\n\n\n\n<li>Tyhji\u00f6j\u00e4rjestelm\u00e4t<\/li>\n\n\n\n<li>Specialized industrial equipment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tracer-gas testing requires specialized equipment and controlled procedures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dye Penetration Testing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Colored water or fluorescent liquid can help identify the path of water entry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is useful during failure analysis but may contaminate the assembly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Creating a Leak-Test Specification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A useful leak-test requirement should define more than \u201cno leakage.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It should include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Test method<\/li>\n\n\n\n<li>Test pressure<\/li>\n\n\n\n<li>Water depth<\/li>\n\n\n\n<li>Test duration<\/li>\n\n\n\n<li>Product orientation<\/li>\n\n\n\n<li>Stabilization time<\/li>\n\n\n\n<li>Allowable pressure loss<\/li>\n\n\n\n<li>Allowable leak rate<\/li>\n\n\n\n<li>Inspection method<\/li>\n\n\n\n<li>Sample quantity<\/li>\n\n\n\n<li>Test frequency<\/li>\n\n\n\n<li>Environmental conditioning<\/li>\n\n\n\n<li>Pass\/fail criteria<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The test method should be agreed upon before mass production.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prototype Validation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Waterproof sealing performance should be validated using production-intent materials and geometry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A practical validation sequence may include:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Dimensional inspection of the seal and groove<\/li>\n\n\n\n<li>Assembly-force measurement<\/li>\n\n\n\n<li>Initial leak testing<\/li>\n\n\n\n<li>L\u00e4mp\u00f6syklit<\/li>\n\n\n\n<li>Vibration testing<\/li>\n\n\n\n<li>Mechanical shock testing<\/li>\n\n\n\n<li>Kemikaaleille altistuminen<\/li>\n\n\n\n<li>Aging evaluation<\/li>\n\n\n\n<li>Repeat leak testing<\/li>\n\n\n\n<li>Final visual inspection<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Prototype testing should also cover tolerance extremes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A design that works only with nominal dimensions may fail during mass production.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Manufacturing Quality Requirements<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Potential manufacturing defects in waterproof silicone seals include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excessive flash<\/li>\n\n\n\n<li>Short molding<\/li>\n\n\n\n<li>Air bubbles<\/li>\n\n\n\n<li>Tears<\/li>\n\n\n\n<li>Saastuminen<\/li>\n\n\n\n<li>Surface dents<\/li>\n\n\n\n<li>Parting-line mismatch<\/li>\n\n\n\n<li>Incorrect hardness<\/li>\n\n\n\n<li>Poorly bonded joints<\/li>\n\n\n\n<li>Mitojen vaihtelu<\/li>\n\n\n\n<li>Distorted profiles<\/li>\n\n\n\n<li>Damaged sealing lips<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Inspection requirements may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mitat<\/li>\n\n\n\n<li>Shore A hardness testing<\/li>\n\n\n\n<li>Silm\u00e4m\u00e4\u00e4r\u00e4inen tarkastus<\/li>\n\n\n\n<li>Materiaalin tarkastus<\/li>\n\n\n\n<li>Compression-set testing<\/li>\n\n\n\n<li>Joint-strength testing<\/li>\n\n\n\n<li>Leak testing<\/li>\n\n\n\n<li>Er\u00e4n j\u00e4ljitett\u00e4vyys<\/li>\n\n\n\n<li>Color verification<\/li>\n\n\n\n<li>Pakkausten tarkastus<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The sealing surface should be protected from dust, deformation, sharp tools, and unsuitable packaging.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Information to Include in a Waterproof Seal RFQ<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">To receive an accurate quotation and engineering review, provide:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Two-dimensional drawing<\/li>\n\n\n\n<li>Three-dimensional model<\/li>\n\n\n\n<li>Tiivisteen profiili<\/li>\n\n\n\n<li>Critical dimensions<\/li>\n\n\n\n<li>Uran mitat<\/li>\n\n\n\n<li>Housing material<\/li>\n\n\n\n<li>Silikonin kovuus<\/li>\n\n\n\n<li>Required material grade<\/li>\n\n\n\n<li>K\u00e4ytt\u00f6l\u00e4mp\u00f6tila<\/li>\n\n\n\n<li>Water exposure conditions<\/li>\n\n\n\n<li>Sis\u00e4inen tai ulkoinen paine<\/li>\n\n\n\n<li>Target protection level<\/li>\n\n\n\n<li>Kemikaaleille altistuminen<\/li>\n\n\n\n<li>Assembly method<\/li>\n\n\n\n<li>Fastener torque<\/li>\n\n\n\n<li>Annual order quantity<\/li>\n\n\n\n<li>Sample quantity<\/li>\n\n\n\n<li>Regulatory requirements<\/li>\n\n\n\n<li>Leak-test method<\/li>\n\n\n\n<li>Inspection and packaging requirements<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Photos or drawings of the final assembly can help the supplier identify potential sealing risks before tooling.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Choose a Waterproof Silicone Seal Supplier<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A suitable supplier should be able to support more than part molding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Important capabilities include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Seal profile design review<\/li>\n\n\n\n<li>Materiaalivalinta<\/li>\n\n\n\n<li>Compression analysis<\/li>\n\n\n\n<li>Groove review<\/li>\n\n\n\n<li>Tooling development<\/li>\n\n\n\n<li>Prototype molding<\/li>\n\n\n\n<li>LSR-ruiskupuristus<\/li>\n\n\n\n<li>Compression molding<\/li>\n\n\n\n<li>Silicone extrusion<\/li>\n\n\n\n<li>Overmolding<\/li>\n\n\n\n<li>Mitatarkastus<\/li>\n\n\n\n<li>Leak testing<\/li>\n\n\n\n<li>Materiaalien j\u00e4ljitett\u00e4vyys<\/li>\n\n\n\n<li>Failure analysis<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Before approving tooling, ask the supplier to review the sealing path, compression ratio, groove fill, parting-line location, corner design, and assembly process.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Johtop\u00e4\u00e4t\u00f6s<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Reliable waterproof performance is created by the complete sealing system, not by silicone material alone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The seal profile, hardness, groove geometry, compression, housing stiffness, fastener spacing, surface quality, temperature exposure, and assembly process must work together.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Industrial procurement engineers should define the actual water exposure conditions and required leak-testing method before requesting quotations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A well-designed silicone seal should be tested after thermal cycling, mechanical stress, aging, and tolerance variation\u2014not only immediately after assembly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Early engineering review and clear validation requirements can reduce water-ingress failures, shorten development time, and improve long-term product reliability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Usein kysyttyj\u00e4 kysymyksi\u00e4<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What silicone hardness is suitable for waterproof seals?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Many waterproof sealing applications use silicone between 30 and 70 Shore A. Softer materials conform more easily, while harder materials provide greater dimensional stability. The final hardness should be validated with the actual groove and housing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How much should a silicone gasket be compressed?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The required compression depends on the profile, hardness, groove, housing, temperature, and pressure. Too little compression may leak, while excessive compression can damage the seal or distort the housing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can silicone seals be used outdoors?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Silicone generally offers good resistance to ultraviolet exposure, ozone, temperature variation, and weathering. The exact formulation should still be selected according to the operating environment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why does a waterproof enclosure leak near the screws?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The housing may be bending between fasteners, or the gasket compression may be uneven. Fastener spacing, torque, housing rigidity, and gasket geometry should be reviewed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is an immersion test enough to validate a waterproof seal?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not always. The product may also need thermal cycling, vibration, aging, pressure testing, and repeat leak testing to confirm long-term reliability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the best leak test for mass production?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Air-pressure decay testing is commonly used because it is clean, fast, quantitative, and suitable for automation. The correct method depends on the product volume, allowable leak rate, and internal geometry.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Are molded gaskets better than bonded extruded gaskets?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Molded closed-loop gaskets generally provide better corner and joint consistency. Extruded and bonded gaskets may be more economical for large sizes, but the joint must be carefully controlled and tested.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can silicone be overmolded directly onto plastic?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. LSR can be overmolded onto compatible plastics or mechanically locked to the substrate. Adhesion performance depends on the plastic type, silicone formulation, surface preparation, and part design.<\/p>","protected":false},"excerpt":{"rendered":"<p>Waterproof silicone seals are widely used in electronic enclosures, outdoor lighting, sensors, battery systems, control panels, appliances, automotive components, medical equipment, and industrial assemblies. Although silicone offers excellent flexibility, temperature resistance, and weatherability, the material alone does not guarantee waterproof performance. A reliable seal depends on the interaction between the seal profile, groove dimensions, compression [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2535,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[1515,1992,1990,1998,1994,1993,1996,1991,1997,1995,1537],"class_list":["post-2534","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news","tag-custom-silicone-seals","tag-enclosure-sealing","tag-immersion-testing","tag-ip-waterproof-seal","tag-leak-testing","tag-lsr-waterproof-seals","tag-pressure-decay-testing","tag-silicone-gasket-design","tag-silicone-seal-compression","tag-waterproof-gasket","tag-waterproof-silicone-seals"],"_links":{"self":[{"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/posts\/2534","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/comments?post=2534"}],"version-history":[{"count":1,"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/posts\/2534\/revisions"}],"predecessor-version":[{"id":2536,"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/posts\/2534\/revisions\/2536"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/media\/2535"}],"wp:attachment":[{"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/media?parent=2534"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/categories?post=2534"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fhysilicone.com\/fi\/wp-json\/wp\/v2\/tags?post=2534"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}