Material selection
Use molding for complex profiles and endless rings; use die-cut silicone for flat, low-profile gasket shapes.
DRAWING-BASED CUSTOM PARTS
Custom Molded Silicone Seals
Non-standard silicone seals molded for complex grooves, circular rings and dust-control geometries that flat sheet cannot achieve.
Custom compression-molded silicone seals for durable environmental sealing, dust exclusion and temperature-resistant assemblies.
Engineered Custom Molded Silicone Seals
Molded silicone seals are used when the part needs a three-dimensional cross-section, continuous ring, retaining lip or integrated locating feature. Tooling creates repeatable geometry for assemblies that cannot be sealed effectively with a flat die-cut gasket.
Material approach
Silicone gives molded parts excellent temperature flexibility and resistance to ozone, weathering and long-term environmental aging.
Key features
- Three-dimensional molded geometry
- integrated lips and grooves
- temperature stability
- dust exclusion
- custom colour and durometer.
Custom Specifications
Typical values for reference only. Final material grade, tolerance and dimensional capability are confirmed after drawing review.
| Material | Molded silicone rubber |
|---|---|
| Thickness range | 0.5-25 mm section thickness |
| Typical thickness | 2-6 mm section thickness |
| Size range | Custom molded rings and profiles from 5 mm to 500 mm overall size |
| Temperature range | -60 to 230 C |
| Hardness range | Shore A 20-80 |
| Tolerance | Molded tolerances per drawing and part size; critical dimensions reviewed at DFM |
| Standards | FDA and LFGB options, USP Class VI material options, UL 94 ratings and RoHS/REACH documentation by compound. |
MATERIAL SELECTION
Molded Silicone Seals Material Comparison
Use this as a starting point only; the selected grade and construction are confirmed against the drawing and application.
| Material | Primary strength | Selection focus | Best fit |
|---|---|---|---|
| General-purpose silicone | Silicone gives molded parts excellent temperature flexibility and resistance to ozone, weathering and long-term environmental aging. | Use molding for complex profiles and endless rings; use die-cut silicone for flat, low-profile gasket shapes. | Round sealing rings, dust boots, connector seals, appliance covers, lighting housings, medical equipment and complex enclosure interfaces. |
| LSR | Elastic recovery, compression set, tear strength, dielectric behavior and temperature range depend on the silicone compound. | Use molding for complex profiles and endless rings; use die-cut silicone for flat, low-profile gasket shapes. | Round sealing rings, dust boots, connector seals, appliance covers, lighting housings, medical equipment and complex enclosure interfaces. |
| platinum-cured silicone | Elastic recovery, compression set, tear strength, dielectric behavior and temperature range depend on the silicone compound. | Use molding for complex profiles and endless rings; use die-cut silicone for flat, low-profile gasket shapes. | Round sealing rings, dust boots, connector seals, appliance covers, lighting housings, medical equipment and complex enclosure interfaces. |
PRODUCT EXAMPLES
Custom Part Gallery
CONVERTING OPTIONS
Manufacturing & Finish Options
Tooling is justified when the section profile, repeatability or annual volume exceeds what die-cut sheet can provide.
DESIGN REVIEW
Engineering Guide
Practical points to include when selecting foam and preparing a drawing for review.
Geometry and thickness
Use smooth radii, consistent wall sections and realistic draft where tooling allows; specify the mating groove and compression target.
Assembly performance
Molded seals benefit from DFM review of parting lines, flash zones, venting and post-cure needs before tool release.
Production route
Tooling is justified when the section profile, repeatability or annual volume exceeds what die-cut sheet can provide.
Applications / Where It Fits
Custom compression-molded silicone seals for durable environmental sealing, dust exclusion and temperature-resistant assemblies. The final specification is established around the drawing and operating requirements.
When This Part May Not Be the Best Choice
Low-volume simple flat gaskets where die cutting is more economical, petroleum fuel contact, or abrasive reciprocating seals.
PROJECT DELIVERY
Manufacturing Capabilities
Available options are confirmed against the selected material, drawing and order requirements.
| Capability | Options |
|---|---|
| Manufacturing process | Compression molding, liquid silicone injection molding, post-curing, trimming and assembly |
| Adhesive options | None, silicone PSA, acrylic PSA and overmolded or mechanically retained features. |
| Surface options | Matte, polished, textured, coloured, clear and post-cured finishes. |
| Custom options | Cross-section, groove, lip, flash requirement, colour, durometer, insert molding, part marking and packaging. |
| Standards | FDA and LFGB options, USP Class VI material options, UL 94 ratings and RoHS/REACH documentation by compound. |
Drawing Requirements
Recommended drawing formats
Please include
- three-dimensional section
- groove geometry
- compression target
- parting-line constraints and annual quantity
For a precise custom molded silicone seals quotation, provide three-dimensional section, groove geometry, compression target, parting-line constraints and annual quantity.
Frequently Asked Questions
When is molding better than die cutting?
Molding is preferred when the seal needs a three-dimensional profile, integral lip, complex cross-section or continuous ring.
Can silicone seals be moulded in colour?
Yes. Standard and custom colours, including translucent grades, can be selected with the compound.
Do molded silicone parts need tooling?
Yes. Compression or injection molding needs a tool, which is reviewed against expected volume and required geometry.
Can a seal include a locating feature?
Yes. Molded designs can add ribs, clips, grooves and alignment features for more reliable assembly.
What should a drawing include for custom molded silicone seals?
Include three-dimensional section, groove geometry, compression target, parting-line constraints and annual quantity.
Can custom molded silicone seals be supplied for production assembly?
Yes. Tooling is justified when the section profile, repeatability or annual volume exceeds what die-cut sheet can provide. Delivery format, liner configuration and packaging are specified for the assembly workflow.
How is the right custom molded silicone seals construction selected?
Use molding for complex profiles and endless rings; use die-cut silicone for flat, low-profile gasket shapes. The drawing and operating conditions establish the final construction.
CONTINUE YOUR RESEARCH
Related Parts, Materials & Capabilities
DRAWING-BASED MANUFACTURING
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