BEST SELLER
Custom Molded Silicone Washers
Molded silicone washers are built in dedicated tooling for profiles a flat sheet can't produce — sealing lips, grooves, steps, bosses and controlled 3D compression zones — held to ±0.02mm tolerance in FDA- and NSF-compliant VMQ compounds. Start a project discussion with your drawing or sample.
Molded vs. Die-Cut — Why Geometry Decides
Need a flat washer without 3D features? Die-cut silicone from sheet is often the more economical option. See silicone washers made from sheet for this type of application.
Molding becomes necessary when the part requires a raised lip, recessed groove, stepped outside diameter, boss, or compression zone that a single-thickness die cannot produce. For a cost and tolerance comparison across different order volumes, see die-cut vs. molded rubber washers.
3D Profile & Feature Capabilities
Molded silicone washers we produce can combine:
| Feature | Function |
|---|---|
| Raised sealing lips | Defined contact line within the washer face |
| Grooves / channels | Controlled seating or compression space |
| Stepped OD/sections | Multiple thicknesses in one molded part |
| Bosses & locating ribs | Consistent orientation during assembly |
| Chamfers | Reduced edge stress or easier insertion |
| Dual-durometer / insert-bonded builds | Two materials or a metal insert in one molded washer |
Dimensional control runs to ±0.02mm on the 0–10mm range (looser bands apply above that), backed by SPC and a Cpk >1.33 target on critical dimensions.
Specifications
| Spec | Range |
|---|---|
| ID | From ~2mm up to large custom bores |
| OD | Up to 100mm+ in a single cavity; larger by custom tooling |
| Thickness | 0.5mm–10mm typical molded range |
| Hardness | 30–80 Shore A |
| Standard colors | Translucent, white, red, black, or custom color matched to a reference sample |
Material & Performance Specs
Manufacturing Process
Manufacturing & Quality Process
-
1
Process control
Parts are produced by injection or compression molding under IATF 16949:2016 and ISO 13485:2016-certified process control.
-
2
Engineering review
3D CAD, STEP and IGES files are accepted for feasibility checks and cavity or parting-line planning before tooling.
-
3
RFQ and tooling
MOQ, tooling cost and tooling lead time are confirmed for each project. Geometry, cavity count and compound choice determine the final price and schedule.
-
4
Prototyping and production
Functional prototypes typically ship within 3–5 business days after drawing approval. Production lead time is scheduled after first-sample sign-off.
Applications
Applications
Silicone washers are used as seals, spacers and cushions in appliance housings, medical devices, electrical enclosures and plumbing fittings. When the part requires a material other than silicone, see custom rubber washers. For solid discs or pads without a center hole, see custom rubber discs.
For guidance on material selection, sizing and common applications, see our guide to rubber washer types and uses.
Request a Quote
Request a Custom Silicone Washer Quote
Send a profile drawing (2D or 3D), the ID/OD/thickness, any compression target, and your material requirement (FDA, NSF, or a specific hardness). Request a quote and our engineers will confirm moldability, tooling cost, and lead time before production.
For food-contact, medical or high-temperature flat seals, silicone rubber gaskets cover the range EPDM and NBR cannot.
FAQ
Frequently Asked Questions
What are silicone washers for?
They seal or space parts in high-heat, food-contact, or medical assemblies where standard rubbers degrade — FDA-compliant and NSF-compliant VMQ grades are available for those contact requirements.
What are the downsides of silicone?
Need oil resistance? NBR washers hold up where silicone swells — silicone also tears more easily than NBR or FKM under sharp-edge contact. See Custom NBR Rubber Parts for oil or fuel exposure.
Are silicone washers safe?
FDA-compliant and NSF-compliant material grades are available for food- and medical-contact use, confirmed per the specific compound selected rather than as a blanket certification across all silicone.
You May Also Need
Related Products
Explore complementary sealing solutions from our comprehensive product catalog.