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.
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.
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.
| 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 |
Parts are produced by injection or compression molding under IATF 16949:2016 and ISO 13485:2016-certified process control.
3D CAD, STEP and IGES files are accepted for feasibility checks and cavity or parting-line planning before 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.
Functional prototypes typically ship within 3–5 business days after drawing approval. Production lead time is scheduled after first-sample sign-off.
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.
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.
Explore complementary sealing solutions from our comprehensive product catalog.
