Solid Silicone Rubber Gaskets
Manufacturer & Custom Solutions
Solid Silicone Rubber Gaskets
Solid silicone rubber gaskets from ZSR Silicone offer the best compression set resistance and longest service life. This is the go-to material for static seals in industrial, automotive and food equipment.
FDA 21 CFR 177.2600
Rubber Articles Intended for Repeated Use
LFGB 30&31
EU Food Contact Materials
USP Class VI / ISO 10993
Biocompatibility of Medical Devices
RoHS / REACH
Environmental Compliance
UL 94
Flammability of Plastic Materials
Built to Your Exact Spec
Custom Silicone Gaskets Options
| Image | Product | Type | Short Info | Action |
|---|---|---|---|---|
 | DIN 32676 Silicone Gasket | Standard & Size | DIN 32676 tri-clamp silicone gaskets, FDA food grade, full size range in stock at ZSR factory. | View Details |
 | AS568 Standard Silicone Gaskets | Standard & Size | AS568 standard-size silicone gaskets for groove-based sealing applications. | View Details |
 | DIN 3869 Silicone Sealing Ring | Standard & Size | DIN 3869 profile sealing rings in silicone for hydraulic ports, working from -60°C to +200°C. | View Details |
 | EN 1514-1 Silicone Gasket | Standard & Size | EN 1514-1 silicone flat gaskets for PN flanges, IBC and FF types, standard and custom sizes. | View Details |
 | Custom Die Cut Silicone Gaskets | Standard & Size | Flat silicone gaskets cut to any shape from sheet stock. Precision cutting for exact fits. | View Details |
 | ISO 7483 Silicone Gasket | Standard & Size | Silicone gaskets to ISO 7483 for ISO 7005 flanges, made for international projects and tenders. | View Details |
 | Custom Molded Silicone Gaskets | Standard & Size | Three-dimensional silicone gaskets made by compression or injection molding. For complex sealing shapes. | View Details |
 | ISO 1127 Silicone Gasket | Standard & Size | Sanitary silicone gaskets matched to ISO 1127 stainless steel tube sizes for food and pharma lines. | View Details |
 | Standard Flange Silicone Gaskets | Standard & Size | Silicone gaskets cut to fit pipe flanges. Matches ANSI, DIN and JIS bolt patterns. | View Details |
 | B16.21 Silicone Gasket | Standard & Size | ZSR makes silicone gaskets to ASME B16.21, ring type and full face type, for Class 150 to 2500 pipe flanges. | View Details |
 | ISO 2852 Silicone Gasket | Standard & Size | ISO 2852 silicone clamp gaskets for food industry couplings, FDA grade, factory direct from ZSR. | View Details |
 | Tri-Clamp / Sanitary Silicone Gaskets | Standard & Size | Hygienic silicone gaskets for food and pharmaceutical pipe connections. CIP and SIP compatible. | View Details |
 | B16.5 Silicone Gasket | Standard & Size | Silicone gaskets from ZSR sized to fit ASME B16.5 flanges, NPS 1/2 to 24 inch, Class 150 to 2500. | View Details |
 | Metric Size Silicone Gaskets | Standard & Size | Metric dimension silicone gaskets for international equipment standards. | View Details |
 | DIN 7603 Silicone Sealing Ring | Standard & Size | Flat silicone sealing rings made to DIN 7603 for screw plugs, banjo bolts and threaded fittings. | View Details |
 | DIN 2690 Silicone Gasket | Standard & Size | Silicone flat gaskets to DIN 2690 / EN 1514-1 dimensions for PN6 to PN40 flanges, food grade available. | View Details |
 | DIN 2691 Silicone Gasket | Standard & Size | Silicone gaskets made to DIN 2691 for tongue and groove flanges PN10 to PN160, ideal for plant repair. | View Details |
 | DIN 11851 Silicone Gasket | Standard & Size | Food grade silicone gaskets for DIN 11851 sanitary unions, DN10 to DN150, FDA material. | View Details |
 | FDA Food Grade Silicone Gasket | Grade | Food-safe silicone gaskets for processing equipment. FDA-compliant and taste-neutral. | View Details |
 | Medical Grade Silicone Gasket | Grade | Biocompatible silicone gaskets for medical devices. Sterilizable with full documentation. | View Details |
 | Industrial Grade Silicone Gasket | Grade | General-purpose silicone gaskets for industrial sealing. Reliable, durable and cost-effective. | View Details |
 | High Temperature / Heat Resistant Silicone Gaskets | Special Function | Heat-resistant silicone gaskets rated for continuous use above 200°C. For ovens and furnaces. | View Details |
 | Flame Retardant Silicone Gaskets | Special Function | Self-extinguishing silicone gaskets meeting UL 94 V-0. For fire-safety applications. | View Details |
 | Solid Silicone Rubber Gaskets | Materials | Solid silicone rubber gaskets with excellent compression set resistance and long service life. | View Details |
 | Fluorosilicone (FVMQ) Gaskets | Materials | Fuel and solvent-resistant silicone gaskets for chemical processing and automotive applications. | View Details |
 | Transparent / Clear Silicone Gaskets | Color | Clear silicone gaskets for visible sealing and light-transmitting applications. | View Details |
 | Black / White Silicone Gaskets | Color | Standard black and white silicone gaskets. Fastest delivery from stock. | View Details |
Solid Silicone vs Sponge vs Foam
All three materials are real silicone rubber, but their structures are very different — and so is the way they seal:
Property | Solid Silicone | Silicone Sponge | Silicone Foam |
|---|---|---|---|
Structure | Dense, no air cells | Closed cells (gas-filled) | Open or partly closed cells |
Density | High (1.1 – 1.3 g/cm³) | Medium (0.4 – 0.8 g/cm³) | Low (0.2 – 0.6 g/cm³) |
Hardness | 10 – 90 Shore A | Soft to firm | Very soft |
Compression | Low squeeze, high force needed | Medium squeeze, medium force | High squeeze, very low force |
Sealing Pressure | Highest — handles real pressure | Medium | Low — for dust and splash only |
Water Resistance | Watertight, even without compression | Watertight when compressed | Needs 50–70% compression to block water |
Strength & Tear | Highest | Good | Lowest |
Temperature Range | -60°C to +250°C | -73°C to +260°C | -55°C to +200°C |
Typical Use | Flange seals, valves, pumps, food and medical gaskets | Enclosure seals, door seals, outdoor housings | Gap filling, cushioning, light indoor seals |
solid silicone is dense, strong, and handles the highest pressure. Sponge is lighter and seals well at low closure force. Foam is the softest and lightest — made for cushioning and gap filling, not for pressure.
Hardness and Compression Options
Solid silicone can be made from very soft (10 Shore A) to very hard (90 Shore A). Hardness changes how the gasket behaves under compression:
Hardness (Shore A) | Feel | How It Seals | Best For |
|---|---|---|---|
10 – 30 | Extra soft, like a gel pad | Seals with almost no force | Fragile parts, plastic housings, low clamp force |
30 – 50 | Soft, like a rubber band | Fills scratches and gaps easily | Rough, cast, or uneven surfaces |
50 – 70 | Medium, like a shoe sole | Balanced sealing and strength | General sealing — 70 Shore A is the industry default |
70 – 90 | Hard, like a tire tread | Needs high force, but will not squeeze out | High bolt loads, high pressure, extrusion resistance |
The trade-off is simple: softer gaskets (20–40 Shore A) conform to rough or uneven surfaces and seal at low force — but under high bolt load they can squeeze out of the joint. Harder gaskets (60–80 Shore A) resist extrusion and hold high pressure — but they cannot follow a rough surface, so they need smoother, flatter faces.
Thickness matters too. A thick gasket in a soft grade can replace a hard grade when the clamp force is limited. Tell us your surface condition and your bolt load — we will suggest the right hardness for free.
When to Choose Solid Silicone Gaskets
Solid silicone is the right choice when your seal must do real work:
High-pressure flanges and pipe joints
the dense structure will not let water or air pass, even at full bolt load
Food and medical contact
FDA and medical grade solid silicone is the standard material for sanitary seals
High-temperature equipment
ovens, heaters, engine parts, steam lines up to 250°C
Outdoor weather exposure
nothing beats solid silicone against UV, ozone, rain, and years of sunlight
Electrical insulation
solid silicone has the best dielectric strength of the three forms
Our rule of thumb
If your application does not need the cushioning of sponge or the lightness of foam, choose solid silicone. It is the default gasket material — the strongest, the most watertight, and usually the most cost-effective per sealing year.
What Is Solid Silicone Rubber?
Solid silicone rubber is the dense, fully solid form of silicone elastomer — a flexible rubber with no air cells, no foam, and no pores inside. It starts as a gum-like raw compound, and is cured with heat into sheets or molded parts. The result is a tough, elastic material that seals, insulates, and protects in places where ordinary rubber fails. At ZSR Silicone Parts, solid silicone is our most-used gasket material — and the starting point for most custom sealing projects.
Key Properties of Solid Silicone Rubber
