Silicone Seals & Gaskets
O-rings, face seals, compression seals, and custom-profile molded sealing components
Product Overview
SIKING manufactures custom sealing components across four main product types — O-rings, face seals, compression seals, and custom-profile extrusions. Applications span automotive under-hood environments, industrial equipment enclosures, electronics sealing, and medical device assemblies.
Material selection depends on application temperature, media exposure, and compression requirements. SIKING offers standard silicone, fluorosilicone (VMQ/FVMQ), and conductive silicone variants. Hardness range covers 0–90 Shore A.
- Temperature resistance: -60°C to +200°C (standard silicone)
- Fluorosilicone for fuel, oil, and solvent exposure
- Custom geometry and profile extrusions available
- MOQ: 1,000 units on tooled parts
Seal & Gasket Variants
Select the seal type that matches your interface geometry, operating environment, and assembly method.
O-Rings
Standard and custom-profile O-rings manufactured to AS568, ISO 3601, or customer-supplied dimensional specifications. Available in all durometer grades from very soft (20 Shore A) through hard (90 Shore A) depending on groove geometry and compression ratio requirements.
- Standard profiles: round, square, X-ring
- Custom profiles: customer-drawing or DFM consultation
- Materials: VMQ, FVMQ, conductive silicone
Face Seals / Flange Gaskets
Flat gaskets for face-to-face sealing interfaces, including flanged pipe connections, enclosure lids, and panel-mount assemblies. Custom shapes molded directly from customer drawings — no profile extrusion needed for flat geometry.
- Complex punch-out geometry available
- Softer materials preferred (30–50 Shore A) for low-bolt-load flanges
- Applications: enclosures, fluid systems, instrumentation
Compression Seals
Seals designed to carry structural load while maintaining ingress protection. Typically harder materials (50–80 Shore A) to resist over-compression. Used where the seal must also act as a vibration damper or standoff.
- Compression set resistance: key selection criterion
- Dual function: sealing + vibration isolation
- Applications: automotive mounts, industrial enclosures
Custom Profile Extrusions & Molded Seals
Non-standard cross-section profiles produced by extrusion or compression molding from customer-supplied drawings. Window seals, door seals, and channel seals in continuous or cut-to-length formats. Complex cross-sections with integral features (lips, bulbs, hollow chambers) are supported.
- Profile complexity: standard 7–10 days; complex 15–20 days
- Cut-to-length or continuous roll supply
- Applications: enclosures, door seals, window gaskets
Material & Performance Data
| Property | Standard Silicone (VMQ) | Fluorosilicone (FVMQ) | Conductive Silicone |
|---|---|---|---|
| Temperature range | -60°C to +200°C | -65°C to +200°C | -40°C to +150°C |
| Fuel / oil resistance | Poor | Good | Poor |
| Hardness range (Shore A) | 20–90 | 40–80 | 30–70 |
| Compression set resistance | Good | Very good | Good |
| Primary use case | General sealing | Automotive under-hood, fuel systems | EMI shielding, grounding |
Hardness selection guidance: Softer compounds (20–40 Shore A) are preferred for low-load sealing where the material must deform to fill surface irregularities. Harder compounds (50–80 Shore A) are used where the seal must resist extrusion under pressure or carry compressive structural load. For compression set resistance, select the lowest acceptable hardness — harder materials typically show lower compression set over time in silicone.
Where These Seals Are Used
Automotive Under-Hood
Fluorosilicone seals and gaskets for engine bay applications where heat, oil, and fuel exposure are primary concerns. Connector seals, grommet seals, and custom profile gaskets.
Industrial Equipment
Enclosure gaskets, shaft seals, and compression seals for machinery, pumps, and control panels. Temperature and chemical resistance selected to application environment.
Electronics Enclosures
EMI shielding gaskets (conductive silicone) and IP-rated enclosure seals for electronic housings. Compression-molded to enclosure geometry without post-processing.
Medical Devices
Soft, cleanable seals for handheld and benchtop medical equipment. Material traceability available. For medical-grade LSR applications, see Medical Silicone →
Manufacturing Process
Seals and gaskets are produced by compression molding or transfer molding depending on profile complexity and material. SIKING's in-house tooling team designs and builds molds from customer drawings, enabling DFM review before tooling commitment.
For non-standard profiles, SIKING's tooling capability covers multi-cavity molds and insert-molded geometries. Extrusion tooling is available for continuous-profile seals supplied cut-to-length.
- In-house CNC tooling — no external tooling vendors
- 20+ compression presses, 200–400T capacity
- Large-format press: 400T, up to 800×1200mm
- Full dimensional inspection and traceability
Need Custom Seals or Gaskets?
Send your drawing, profile specification, or application description. We'll confirm material selection and quote within 48 hours.