{"id":2832,"date":"2026-08-08T05:25:43","date_gmt":"2026-08-08T05:25:43","guid":{"rendered":"https:\/\/www.fhysilicone.com\/?p=2832"},"modified":"2026-08-08T05:25:54","modified_gmt":"2026-08-08T05:25:54","slug":"silicone-part-dfm-checklist-12-things-to-review-before-opening-a-mold","status":"publish","type":"post","link":"https:\/\/www.fhysilicone.com\/ru\/silicone-part-dfm-checklist-12-things-to-review-before-opening-a-mold\/","title":{"rendered":"Silicone Part DFM Checklist: 12 Things to Review Before Opening a Mold"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Opening a production mold is one of the most important commitment points in a custom silicone molding project.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before tooling begins, many decisions are still inexpensive to change in CAD.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After the mold has been machined, even a small design change can require:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>insert modification;<\/li>\n\n\n\n<li>welding;<\/li>\n\n\n\n<li>re-machining;<\/li>\n\n\n\n<li>new EDM work;<\/li>\n\n\n\n<li>mold re-polishing;<\/li>\n\n\n\n<li>repeated sampling;<\/li>\n\n\n\n<li>additional tooling cost.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For this reason, a proper <strong>Design for Manufacturability, or DFM, review<\/strong> should be completed before mold construction starts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A silicone part may look perfectly acceptable on a 3D model but still create manufacturing problems such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>excessive flash;<\/li>\n\n\n\n<li>difficult demolding;<\/li>\n\n\n\n<li>unstable dimensions;<\/li>\n\n\n\n<li>tearing;<\/li>\n\n\n\n<li>sink or deformation;<\/li>\n\n\n\n<li>impossible parting-line placement;<\/li>\n\n\n\n<li>visible gate marks;<\/li>\n\n\n\n<li>high tooling cost.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This checklist covers 12 important items that engineering and purchasing teams should review before approving a custom silicone mold.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/08\/Custom-Silicone-Gasket-Design-Guide-1-1024x768.png\" alt=\"\" class=\"wp-image-2833\" srcset=\"https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/08\/Custom-Silicone-Gasket-Design-Guide-1-1024x768.png 1024w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/08\/Custom-Silicone-Gasket-Design-Guide-1-300x225.png 300w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/08\/Custom-Silicone-Gasket-Design-Guide-1-768x576.png 768w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/08\/Custom-Silicone-Gasket-Design-Guide-1-16x12.png 16w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/08\/Custom-Silicone-Gasket-Design-Guide-1-600x450.png 600w, https:\/\/www.fhysilicone.com\/wp-content\/uploads\/2026\/08\/Custom-Silicone-Gasket-Design-Guide-1.png 1448w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\">1. Is the Wall Thickness Reasonable?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Wall thickness is one of the first features that should be reviewed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Silicone can mold thin sections, but extremely thin walls may create problems with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>filling;<\/li>\n\n\n\n<li>venting;<\/li>\n\n\n\n<li>tearing;<\/li>\n\n\n\n<li>demolding;<\/li>\n\n\n\n<li>dimensional stability.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Very thick sections can create different problems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They may require:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>longer cure time;<\/li>\n\n\n\n<li>more material;<\/li>\n\n\n\n<li>longer molding cycles.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This increases production cost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A good silicone design should avoid unnecessary transitions between extremely thin and extremely thick regions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whenever possible, wall thickness should be relatively consistent.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why Sudden Thickness Changes Matter<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Consider a silicone cover with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1.0 mm side wall;<\/li>\n\n\n\n<li>8.0 mm solid mounting block.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These areas cure differently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The thick region may require more heat and time to cure completely, while the thin region may already be fully cured.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Large thickness differences can therefore create:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>longer cycle time;<\/li>\n\n\n\n<li>uneven shrinkage;<\/li>\n\n\n\n<li>dimensional variation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If the thick section is not functionally required, consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>coring it out;<\/li>\n\n\n\n<li>adding ribs;<\/li>\n\n\n\n<li>reducing unnecessary material.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This can lower both:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>material cost and cycle time.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">2. Are There Unnecessary Undercuts?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Silicone is flexible, so some undercuts can be demolded by stretching the part.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, not every undercut is easy or safe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041a \u043f\u0440\u0438\u043c\u0435\u0440\u0430\u043c \u043e\u0442\u043d\u043e\u0441\u044f\u0442\u0441\u044f:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>deep internal hooks;<\/li>\n\n\n\n<li>reverse lips;<\/li>\n\n\n\n<li>side holes;<\/li>\n\n\n\n<li>locking grooves;<\/li>\n\n\n\n<li>aggressive internal ribs.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These may require:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>manual demolding;<\/li>\n\n\n\n<li>removable inserts;<\/li>\n\n\n\n<li>sliders;<\/li>\n\n\n\n<li>collapsible cores.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Every additional mechanism increases:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>mold cost;<\/li>\n\n\n\n<li>mold maintenance;<\/li>\n\n\n\n<li>cycle time.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Before approving an undercut, ask:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Can this geometry be changed without affecting product function?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A small geometry modification may eliminate a much more expensive mold structure.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">3. Where Will the Parting Line Be?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Every multi-part mold requires surfaces where mold sections separate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The resulting line on the molded product is called the:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>parting line.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is not simply a tooling detail.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Parting-line location can affect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sealing;<\/li>\n\n\n\n<li>appearance;<\/li>\n\n\n\n<li>assembly;<\/li>\n\n\n\n<li>tactile feel;<\/li>\n\n\n\n<li>flash.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For example, placing a parting line directly across a sealing lip may increase the risk of leakage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Placing it on the front surface of a consumer-facing product may create an unnecessary cosmetic issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Parting-line location should therefore be reviewed before mold machining starts.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Mark Critical Surfaces<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">During DFM, classify surfaces such as:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sealing Surface<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Avoid parting lines where practical.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cosmetic Surface<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Try to move the mold split to a hidden edge.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hidden Surface<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">More molding witness may be acceptable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A simple drawing note can prevent major disagreements after the mold is complete.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">4. Where Will the Gate Be Located?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">For LSR injection molding, silicone must enter the cavity through a gate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The gate can leave a small visible mark called:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>gate vestige;<\/li>\n\n\n\n<li>gate witness;<\/li>\n\n\n\n<li>gate mark.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The buyer should identify areas where gates are:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Allowed<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">and<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Not Allowed.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Surface A: no gate permitted<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Surface C: gate permitted<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is particularly important for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sealing surfaces;<\/li>\n\n\n\n<li>Class A cosmetic areas;<\/li>\n\n\n\n<li>thin membranes;<\/li>\n\n\n\n<li>tactile surfaces.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Do not wait until first samples arrive to decide that the gate is in the wrong place.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Gate Location Also Affects Filling<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Gate location influences more than appearance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It can affect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>material flow;<\/li>\n\n\n\n<li>air trapping;<\/li>\n\n\n\n<li>weld or flow lines;<\/li>\n\n\n\n<li>filling balance;<\/li>\n\n\n\n<li>pressure.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For multi-cavity molds, runner and gate balancing become even more important.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The manufacturer should therefore select the gate position based on both:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>part function + molding performance.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">5. What Flash Is Acceptable?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Silicone can flow into very small gaps before curing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, flash control must be considered during mold design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do not rely on vague requirements such as:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u201cNo flash.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Instead, identify critical areas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sealing Surface<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Very limited residual flash.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No loose flash.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Functional Hole<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Flash must not restrict the opening.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hidden Edge<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Standard molded flash may be acceptable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">More realistic flash requirements make tooling and inspection easier to control.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why Extremely Tight Flash Requirements Increase Tooling Cost<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Very low flash may require:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>precision shut-off surfaces;<\/li>\n\n\n\n<li>better mold fitting;<\/li>\n\n\n\n<li>tighter clamping;<\/li>\n\n\n\n<li>additional polishing;<\/li>\n\n\n\n<li>more frequent mold maintenance.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is especially relevant for low-viscosity LSR.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, apply strict flash limits where function requires them rather than over the entire part.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">6. Are the Tolerances Realistic?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A common DFM problem is applying:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00b10.05 mm<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">or:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00b10.10 mm<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">to every dimension.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Silicone is an elastomer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It behaves differently from machined metal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tolerance capability depends on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>part size;<\/li>\n\n\n\n<li>hardness;<\/li>\n\n\n\n<li>geometry;<\/li>\n\n\n\n<li>mold structure;<\/li>\n\n\n\n<li>parting line;<\/li>\n\n\n\n<li>measurement method.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Large flexible dimensions generally require wider tolerances than small fixed features.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before tooling, classify dimensions as:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Critical<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Directly affects assembly, sealing or function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Functional<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Needs reasonable control.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Non-Critical<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">General molded tolerance is acceptable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This can significantly reduce unnecessary mold complexity and inspection cost.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Fixed Dimension vs Closure Dimension<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Another important distinction is whether the dimension is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>formed entirely within one mold feature<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">or<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>created across the mold closing direction.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Closure dimensions may be more sensitive to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>flash;<\/li>\n\n\n\n<li>mold compression;<\/li>\n\n\n\n<li>clamping;<\/li>\n\n\n\n<li>parting-line behavior.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These dimensions often require wider tolerances than fixed internal features.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">7. Can the Part Be Demolded Without Damage?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A silicone part is not complete when it cures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It must also come out of the mold.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DFM should evaluate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>demolding direction;<\/li>\n\n\n\n<li>stretching;<\/li>\n\n\n\n<li>stripping force;<\/li>\n\n\n\n<li>thin membranes;<\/li>\n\n\n\n<li>fragile features.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A design that requires excessive stretching may create:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>tearing;<\/li>\n\n\n\n<li>permanent deformation;<\/li>\n\n\n\n<li>longer cycle time.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If every part requires an operator to spend 20 seconds carefully removing it, the labor cost becomes significant in mass production.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Consider Automation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">For high-volume projects, ask:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Can the part be automatically demolded?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LSR molding may support:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ejector systems;<\/li>\n\n\n\n<li>air blow;<\/li>\n\n\n\n<li>robotic removal;<\/li>\n\n\n\n<li>automatic stripping.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A geometry optimized for automated demolding can reduce unit manufacturing cost substantially.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">8. Are Holes, Slots and Thin Features Moldable?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Small holes and openings can be molded using core pins.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But very small or long features may be difficult.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Review:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>hole diameter;<\/li>\n\n\n\n<li>hole depth;<\/li>\n\n\n\n<li>pin strength;<\/li>\n\n\n\n<li>hole position tolerance.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A very thin mold pin may:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>bend;<\/li>\n\n\n\n<li>break;<\/li>\n\n\n\n<li>wear.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In some cases, it may be more practical to mold a simpler shape and create the final hole through:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>punching;<\/li>\n\n\n\n<li>cutting;<\/li>\n\n\n\n<li>laser processing.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The best method depends on production volume and tolerance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Thin Membranes Need Special Attention<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Silicone valves and diaphragms often contain very thin sections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These can be sensitive to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>filling;<\/li>\n\n\n\n<li>venting;<\/li>\n\n\n\n<li>thickness variation;<\/li>\n\n\n\n<li>tearing.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The manufacturer should review the membrane geometry before tooling because small thickness changes can have a major effect on performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">9. Are Inserts and Overmolding Features Properly Located?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Some silicone components are molded around:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>metal inserts;<\/li>\n\n\n\n<li>plastic frames;<\/li>\n\n\n\n<li>cables;<\/li>\n\n\n\n<li>electronics.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The mold must hold the insert in a precise position during molding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DFM should evaluate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>locating points;<\/li>\n\n\n\n<li>insert tolerance;<\/li>\n\n\n\n<li>insert movement;<\/li>\n\n\n\n<li>shut-off areas.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If the insert can move during injection or compression, final part dimensions may become unstable.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Mechanical Lock or Chemical Bond?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Another important question is whether the silicone only needs to:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>mechanically surround the insert<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">or<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>chemically bond to it.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Permanent bonding may require:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>primer;<\/li>\n\n\n\n<li>plasma treatment;<\/li>\n\n\n\n<li>surface preparation;<\/li>\n\n\n\n<li>compatible substrate material.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This should be determined before the mold is designed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">10. Is the Silicone Material Fully Defined?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Do not approve production tooling with only the note:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u201cSilicone.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At minimum, clarify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LSR or HCR;<\/li>\n\n\n\n<li>hardness;<\/li>\n\n\n\n<li>color;<\/li>\n\n\n\n<li>curing system.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on the application, also specify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>food-contact requirement;<\/li>\n\n\n\n<li>medical requirement;<\/li>\n\n\n\n<li>flame retardancy;<\/li>\n\n\n\n<li>electrical conductivity;<\/li>\n\n\n\n<li>high-temperature performance.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Different silicone formulations can have different:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>shrinkage;<\/li>\n\n\n\n<li>viscosity;<\/li>\n\n\n\n<li>curing behavior.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This affects mold design.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Material Shrinkage Affects Tool Dimensions<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The mold cavity may need to be larger than the final component to compensate for shrinkage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the silicone grade changes after tooling has been completed, shrinkage behavior may also change.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This can affect dimensions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, the production material should ideally be selected before final mold machining.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">11. Is the Hardness Appropriate?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Silicone hardness affects much more than feel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It can influence:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>demolding;<\/li>\n\n\n\n<li>sealing force;<\/li>\n\n\n\n<li>compression;<\/li>\n\n\n\n<li>deformation;<\/li>\n\n\n\n<li>measurement.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A very soft silicone part may deform under a caliper.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A harder silicone part may require more assembly force.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical custom silicone projects may use hardness levels such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>30 Shore A;<\/li>\n\n\n\n<li>40 Shore A;<\/li>\n\n\n\n<li>50 Shore A;<\/li>\n\n\n\n<li>60 Shore A;<\/li>\n\n\n\n<li>70 Shore A.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The correct value depends on product function.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Avoid selecting hardness simply because:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u201c50 Shore A is standard.\u201d<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Hardness and Geometry Work Together<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The same geometry made in:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>30 Shore A<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">and:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>70 Shore A<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">may behave very differently during:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>assembly;<\/li>\n\n\n\n<li>sealing;<\/li>\n\n\n\n<li>demolding.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For sealing products, hardness must be evaluated together with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>groove depth;<\/li>\n\n\n\n<li>compression;<\/li>\n\n\n\n<li>sealing pressure.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">12. How Will the Part Be Inspected?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Inspection should be considered during DFM, not after production begins.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ask:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How will this dimension actually be measured?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For flexible silicone, conventional calipers may not always provide repeatable readings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on the feature, inspection may use:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>calipers;<\/li>\n\n\n\n<li>optical measurement;<\/li>\n\n\n\n<li>vision systems;<\/li>\n\n\n\n<li>profile projector;<\/li>\n\n\n\n<li>go\/no-go gauge;<\/li>\n\n\n\n<li>custom fixture.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The drawing should define practical measurable requirements.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Define Inspection Datums<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A flexible silicone component may sit differently depending on how it is placed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For complex parts, inspection should define:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>measurement position;<\/li>\n\n\n\n<li>reference surface;<\/li>\n\n\n\n<li>fixture condition.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Otherwise, the buyer and supplier may obtain different results while measuring the same part.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Bonus Review: Does the Design Need a Cosmetic Surface Classification?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Although not always part of the core 12-item checklist, cosmetic classification is highly useful.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consider defining:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Surface A<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Highly visible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Strict cosmetic requirement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Surface B<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Secondary visible surface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Minor molding witness acceptable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Surface C<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hidden.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Standard molded finish acceptable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This allows the tooling engineer to optimize:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>gates;<\/li>\n\n\n\n<li>parting lines;<\/li>\n\n\n\n<li>surface finish.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Bonus Review: Does the Product Need Compression Stops?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">For silicone seals and gaskets, a mechanical compression stop can prevent:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>over-compression;<\/li>\n\n\n\n<li>inconsistent assembly;<\/li>\n\n\n\n<li>premature compression set.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If the product relies on a controlled sealing compression, the housing design should be reviewed together with the silicone part.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">A Practical Silicone DFM Checklist<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before approving mold construction, review:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>No.<\/th><th>DFM Item<\/th><th>Key Question<\/th><\/tr><tr><td>1<\/td><td>\u0422\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438<\/td><td>Is thickness reasonably uniform?<\/td><\/tr><tr><td>2<\/td><td>Undercuts<\/td><td>Can they be removed or simplified?<\/td><\/tr><tr><td>3<\/td><td>Parting Line<\/td><td>Is it away from critical surfaces?<\/td><\/tr><tr><td>4<\/td><td>Gate Location<\/td><td>Is the gate hidden or acceptable?<\/td><\/tr><tr><td>5<\/td><td>Flash<\/td><td>Are realistic limits defined?<\/td><\/tr><tr><td>6<\/td><td>Tolerances<\/td><td>Are only critical dimensions tight?<\/td><\/tr><tr><td>7<\/td><td>Demolding<\/td><td>Can the part be removed safely?<\/td><\/tr><tr><td>8<\/td><td>Holes \/ Thin Features<\/td><td>Are core pins and membranes practical?<\/td><\/tr><tr><td>9<\/td><td>Inserts<\/td><td>Are inserts located securely?<\/td><\/tr><tr><td>10<\/td><td>\u041c\u0430\u0442\u0435\u0440\u0438\u0430\u043b<\/td><td>Is the production grade defined?<\/td><\/tr><tr><td>11<\/td><td>\u0422\u0432\u0451\u0440\u0434\u043e\u0441\u0442\u044c<\/td><td>Does hardness match the function?<\/td><\/tr><tr><td>12<\/td><td>Inspection<\/td><td>Can the requirements be measured reliably?<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Example DFM Review<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Consider a custom silicone housing seal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The original design contains:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1 mm thin wall;<\/li>\n\n\n\n<li>6 mm solid block;<\/li>\n\n\n\n<li>deep side undercut;<\/li>\n\n\n\n<li>gate planned on cosmetic surface;<\/li>\n\n\n\n<li>\u00b10.05 mm tolerance on all dimensions.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">During DFM, the supplier may recommend:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Change 1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Reduce the thick solid block by coring it out.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Benefit:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>less material;<\/li>\n\n\n\n<li>shorter cure time.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Change 2<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modify the undercut.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Benefit:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>eliminate side action;<\/li>\n\n\n\n<li>simplify demolding.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Change 3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Move the gate to hidden Surface C.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Benefit:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>better cosmetic appearance.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Change 4<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Keep \u00b10.05 mm only on one critical sealing feature.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Benefit:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>lower tooling and inspection cost.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is exactly why DFM should happen before machining begins.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Should the Supplier Provide After DFM?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A useful silicone DFM report may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>mold opening direction;<\/li>\n\n\n\n<li>parting-line proposal;<\/li>\n\n\n\n<li>gate proposal;<\/li>\n\n\n\n<li>flash areas;<\/li>\n\n\n\n<li>undercut analysis;<\/li>\n\n\n\n<li>tolerance comments;<\/li>\n\n\n\n<li>demolding concerns;<\/li>\n\n\n\n<li>tooling recommendations.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For complicated parts, screenshots from the 3D model can make the review much easier to understand.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Who Should Approve the DFM?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Ideally, approval should involve:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>product engineer;<\/li>\n\n\n\n<li>purchasing;<\/li>\n\n\n\n<li>silicone manufacturer;<\/li>\n\n\n\n<li>tooling engineer.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Why purchasing?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because DFM decisions affect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>mold cost;<\/li>\n\n\n\n<li>unit price;<\/li>\n\n\n\n<li>mold lead time.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Why engineering?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because geometry changes may affect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sealing;<\/li>\n\n\n\n<li>assembly;<\/li>\n\n\n\n<li>performance.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Both functions should understand the trade-offs.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Do Not Approve the Mold Based Only on Price<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A low tooling price is not helpful if the mold produces:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>unstable dimensions;<\/li>\n\n\n\n<li>excessive flash;<\/li>\n\n\n\n<li>difficult demolding.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Before approving tooling, confirm that the quotation and DFM are based on the same:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>product revision;<\/li>\n\n\n\n<li>material;<\/li>\n\n\n\n<li>tolerance;<\/li>\n\n\n\n<li>annual volume.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This avoids changes after the purchase order has already been issued.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Recommended Pre-Tooling Approval Package<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before the manufacturer begins cutting steel, confirm:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Final 3D CAD<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Correct revision.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Final 2D Drawing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Critical dimensions and tolerances.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Material Specification<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Exact silicone grade where available.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0422\u0432\u0451\u0440\u0434\u043e\u0441\u0442\u044c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">50 \u00b15 Shore A.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0426\u0432\u0435\u0442<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Approved standard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DFM Report<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Parting line, gate, flash and demolding reviewed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Quantity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Annual forecast.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Inspection Requirement<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">FAI and critical features defined.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Only after these items are aligned should production tooling begin.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why DFM Saves Money<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose a mold costs:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>$5,000<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Changing the CAD model before machining may cost almost nothing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Changing the same geometry after mold completion may require:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>welding;<\/li>\n\n\n\n<li>insert replacement;<\/li>\n\n\n\n<li>machining;<\/li>\n\n\n\n<li>new sampling.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This can add substantial cost and delay.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DFM therefore should not be treated as an unnecessary review step.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is one of the most effective methods for controlling tooling risk.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">DFM Also Helps Reduce Unit Price<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Good DFM does not only reduce mold cost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It can improve:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>cycle time;<\/li>\n\n\n\n<li>cavity count;<\/li>\n\n\n\n<li>automation;<\/li>\n\n\n\n<li>production yield.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Removing a difficult undercut may reduce manual demolding by:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>10 seconds per part.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At an annual production quantity of:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>500,000 parts<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">that change can represent a large amount of avoided labor.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Questions Buyers Should Ask Before Opening the Mold<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before approving tooling, ask the silicone manufacturer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Where is the parting line?<\/li>\n\n\n\n<li>Where is the gate?<\/li>\n\n\n\n<li>What flash should we expect?<\/li>\n\n\n\n<li>Are there difficult undercuts?<\/li>\n\n\n\n<li>Can the part demold automatically?<\/li>\n\n\n\n<li>Which dimensions are hardest to control?<\/li>\n\n\n\n<li>Is the silicone grade confirmed?<\/li>\n\n\n\n<li>What shrinkage assumption is being used?<\/li>\n\n\n\n<li>Does the tool support the expected annual volume?<\/li>\n\n\n\n<li>Are any secondary operations required?<\/li>\n\n\n\n<li>How will critical dimensions be inspected?<\/li>\n\n\n\n<li>What design changes would reduce cost?<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If these questions have not been answered, the DFM review is probably not complete.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The best time to solve a silicone molding problem is <strong>before the mold is built<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A good pre-tooling DFM review should confirm 12 core areas:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>wall thickness, undercuts, parting line, gate, flash, tolerances, demolding, small features, inserts, material, hardness and inspection.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These factors directly influence:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>tooling cost;<\/li>\n\n\n\n<li>part quality;<\/li>\n\n\n\n<li>cycle time;<\/li>\n\n\n\n<li>production yield;<\/li>\n\n\n\n<li>long-term unit cost.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The goal of DFM is not to make every design simpler at the expense of function.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The goal is to identify features that create manufacturing difficulty <strong>without adding real product value<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A few hours of engineering review before opening the mold can prevent weeks of tooling correction later.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before approving your next custom silicone mold, ask one final question:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u201cHas the product been designed only to function\u2014or has it also been designed to manufacture reliably?\u201d<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What does DFM mean in silicone molding?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DFM means Design for Manufacturability. It is the engineering review performed before mold construction to identify features that may create tooling, molding, demolding or inspection problems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When should a silicone DFM review be completed?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DFM should be completed after the product geometry is sufficiently mature but before the production mold is machined.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What are the most important silicone DFM issues?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Common issues include wall thickness, undercuts, parting-line location, gate position, flash, tolerances, demolding and material selection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can silicone mold undercuts without sliders?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes. Because silicone is flexible, certain undercuts can be stripped during demolding. Deep or aggressive undercuts may still require removable inserts or mold mechanisms.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why should gate location be approved before tooling?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The gate can affect appearance, sealing surfaces and material flow. Moving the gate after the tool is completed may require expensive modifications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can DFM reduce silicone part cost?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Simplifying demolding, reducing unnecessary material, relaxing non-critical tolerances and improving cavity design can reduce both tooling investment and mass-production unit cost.<\/p>","protected":false},"excerpt":{"rendered":"<p>Opening a production mold is one of the most important commitment points in a custom silicone molding project. Before tooling begins, many decisions are still inexpensive to change in CAD. After the mold has been machined, even a small design change can require: For this reason, a proper Design for Manufacturability, or DFM, review should [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2833,"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":[],"class_list":["post-2832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news"],"_links":{"self":[{"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/posts\/2832","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/comments?post=2832"}],"version-history":[{"count":1,"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/posts\/2832\/revisions"}],"predecessor-version":[{"id":2834,"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/posts\/2832\/revisions\/2834"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/media\/2833"}],"wp:attachment":[{"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/media?parent=2832"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/categories?post=2832"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fhysilicone.com\/ru\/wp-json\/wp\/v2\/tags?post=2832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}