Custom Silicone Gaskets, Seals & O-Rings

Precision-molded sealing components for industrial, automotive, medical and consumer applications — engineered to your dimensions, hardness and compliance requirements.

Sealing Components

Gaskets, Seals, O-Rings & Grommets

From flat gaskets and molded O-rings to custom sealing rings and cable grommets, we produce silicone sealing components that resist temperature, compression and environmental exposure — matched to your exact fit and performance needs.

Custom gaskets — flat, shaped and reinforced profiles
O-rings — standard and custom diameters
Sealing rings & grommets — for panels, cables and enclosures
Custom shapes — engineered to your 2D or 3D drawing

Request a Sealing Part Quote

Custom silicone gaskets, seals and O-rings for industrial and automotive applications

Material & Performance

Material Selection for Sealing Performance

Choose the grade and hardness that matches your sealing environment.

Requirement	Recommended grade	Typical hardness
Food & beverage contact	Food-grade silicone (FDA / LFGB)	40 – 60A
Medical / pharmaceutical	Medical-grade platinum-cured silicone	30 – 50A
Industrial & automotive	Solid silicone rubber (RoHS / REACH)	50 – 70A
High-temperature sealing	High-temperature silicone compound	60 – 80A

Temperature Resistance

Sealing parts rated for -40 °C to +230 °C, depending on the compound selected.

Compression Set

Compounds chosen for low compression set, so seals keep their rebound over repeated cycles.

Precision Fit

Mold cavities machined to ±0.01 mm, with finished-part tolerance confirmed during DFM.

Common Questions

Silicone Gaskets & Seals FAQ

What silicone hardness should I choose for a gasket or seal?

Most sealing applications use Shore 40A–70A. Softer grades (40–50A) seal better on uneven surfaces, while firmer grades (60–70A) hold shape under higher compression. Our DFM review recommends a hardness based on your compression set and sealing requirements.

Can CYES SILICONE make silicone O-rings and gaskets to tight tolerances?

Yes. We machine mold cavities to ±0.01 mm. Because silicone is flexible, finished part dimensions typically hold ±0.1–0.3 mm depending on size. We confirm the tolerance plan during DFM review before tooling.

What is the MOQ for custom silicone gaskets and seals?

MOQ is flexible and depends on part size and cavity count. Small prototype batches are available for verification, with multi-cavity tooling for cost-effective volume production.

Can you match FDA or food-grade silicone for seals?

Yes. We offer food-contact and medical-grade silicone compounds tested for FDA 21 CFR, LFGB, RoHS and REACH compliance as required by your market.

Related Sealing Parts

Need a more focused specification? Explore our dedicated pages for each sealing part.

Silicone O-Rings

Standard AS568 and custom diameters for fluid, air and dust sealing.

View O-rings

Silicone Gaskets

Flat, shaped and reinforced gaskets for flange and cover sealing.

View gaskets

Silicone Seals

Static and dynamic seals for waterproofing and pressure retention.

View seals

Silicone Grommets

Open and closed grommets for cable and panel protection.

View grommets

Silicone Keypads

Conductive keypads with tactile feedback and laser-etched legends.

View keypads

Silicone Suction Cups

Strong-vacuum suction cups for mounting and holding.

View suction cups

Have a Sealing Part to Develop?

Send your drawing, sample or dimensions. We will review material, hardness and tolerance before quoting.

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