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Quick Answer: A rubber gasket is a static sealing part placed between two flat surfaces. The gasket fills surface gaps and prevents leakage of water, oil, steam, gas, or chemicals. CORASEALS supplies rubber gaskets and custom cut gaskets in NBR, FKM, EPDM, silicone, neoprene, PTFE, and other sealing materials.
Rubber gaskets are used on pipe flanges, pump casings, valve covers, heat exchangers, access covers, oil pans, and sanitary connections. As a rubber gasket supplier, CORASEALS provides rubber gaskets together with flange gaskets, spiral wound gaskets, RTJ gaskets, kammprofile gaskets, graphite gaskets, PTFE gaskets, and non-asbestos gaskets. The right gasket depends on operating temperature, pressure, medium, flange design, surface condition, bolt load, and required service life.
A rubber gasket is a flat sealing part. The gasket sits between two mating surfaces and seals the joint under compression. The rubber fills small surface marks and blocks the leakage path. Rubber gaskets work in static joints where the sealing faces do not rotate against each other.
Common rubber gasket forms include sheet cut gaskets, molded rubber gaskets, full face flange gaskets, ring gaskets, sanitary gaskets, and heat exchanger gaskets. CORASEALS also supplies rubber-to-metal bonded parts for assemblies that need a rubber sealing face and a metal locating body.
Material selection controls chemical compatibility, temperature resistance, compression set, and service life. The table lists common rubber gasket materials and typical application windows. These values are general engineering ranges. The final material grade must be checked against the actual fluid, temperature cycle, and mechanical load.
| Material | Typical Temperature Range | Common Media | Main Limitation |
|---|---|---|---|
| NBR | -30°C to 100°C | mineral oils, fuels, water, air | not for strong oxidizers, steam, or weather exposure |
| FKM | -20°C to 200°C | mineral oils, fuels, acids, many chemicals | not for hot water, steam, or ketones; higher cost |
| EPDM | -40°C to 125°C | water, steam, weather, polar solvents | not for most mineral oils and fuels |
| Silicone | -55°C to 200°C | hot air, water, food contact media | poor resistance to oils and fuels |
| Neoprene / CR | -35°C to 100°C | refrigerants, water, weather | not for aromatic fuels or strong acids |
| PTFE | -200°C to 260°C | aggressive chemicals, acids, solvents | not elastic like rubber; lower compression recovery |
NBR gaskets are the standard choice for many oil and fuel joints. FKM gaskets are selected when the gasket must survive higher heat or stronger chemicals. EPDM gaskets are common for water, steam, and outdoor weather exposure. Silicone gaskets can handle hot air and low load food contact but have low tear strength and poor oil resistance. Neoprene gaskets balance weather resistance with moderate oil contact. PTFE gaskets handle aggressive media but need a proper bolted joint design.
CORASEALS supplies rubber gaskets from sheet cutting, CNC cutting, and molded rubber tooling. For a quote, provide the inside diameter, outside diameter, and thickness. If the rubber gasket follows a flange standard, also provide the standard and nominal flange size. Common references include ASME B16.21 for flat non-metallic gaskets and DIN EN 1514 for flange gasket dimensions.
For a replacement gasket, a clear photo next to a ruler is useful. For a drawing, provide the full dimension set:
For ring type rubber gaskets, provide ID and OD. For full face rubber gaskets, provide ID, OD, bolt circle, bolt hole size, and hole quantity. Common sheet thicknesses for industrial rubber gaskets include 1 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, and 5 mm. Metric and inch dimensions are accepted. An inch example is a flange gasket with ID 8.25 in, OD 10.25 in, and thickness 0.125 in.
Rubber gasket hardness is usually between 40 Shore A and 90 Shore A. Softer gaskets seal rough surfaces with lower bolt load. Harder gaskets resist higher pressure and flow. A standard solid rubber gasket for general service often uses 60 Shore A to 70 Shore A.
For high pressure flanges, a soft rubber sheet alone may not be enough. Spiral wound gaskets, kammprofile gaskets, or RTJ gaskets may be required. CORASEALS supplies rubber gaskets and the related gasket range for the same flange joint selection. Exact pressure limits depend on gasket cross section, flange design, bolt load, and operating temperature.
Rubber gaskets seal pipe flanges, pump casings, valve covers, water plates, heat exchangers, sanitary clamps, gearbox covers, and access covers. Rubber gaskets also work as static vibration pads in some bolted assemblies.
Hydraulic systems use rubber gaskets on cover plates and flange connections. Chemical process equipment requires the gasket material to match the chemical list. Food and beverage equipment requires a rubber grade that meets the target food contact regulation. CORASEALS can help compare available food contact EPDM, silicone, and FKM options for a specific market.
Procurement engineers and maintenance teams should provide the gasket type, material, ID, OD, thickness, temperature, pressure, medium, and quantity. If the flange is standardized, send the standard and nominal diameter. If the part is a custom cut shape, send a drawing or sample photo.
Example inquiry:
Flange gasket, EPDM, ID 210 mm, OD 260 mm, thickness 3 mm, water at 90°C, PN16 flange, quantity 50 pieces.
For a full rubber gasket quote, send the gasket type, material, ID × OD × thickness or full dimensions, operating temperature, pressure, medium, flange standard, drawing, sample photo, and required quantity.
EPDM is usually wrong for mineral oil and fuel. NBR is usually wrong for strong oxidizers and steam. FKM is not recommended for hot water or steam service. Silicone is not recommended for high load fuel or oil joints. PTFE is not an elastomer and does not recover like rubber after compression.
Always test the rubber gasket in a small pilot installation when the medium contains mixed solvents, cleaning agents, or temperature cycling.
CORASEALS supplies custom rubber gaskets cut from sheet and molded rubber gaskets made to customer tooling. For low volume or fast replacement, sheet cutting is often faster. For high volume or complex cross sections, molded rubber gaskets can reduce part cost per piece.
For a custom rubber gasket quote, send the gasket type, material, ID × OD × thickness or full dimensions, operating temperature, pressure, medium, drawing, sample photo, and required quantity.
What is the best rubber gasket material for oil? NBR is usually the first choice for mineral oil. FKM is selected when temperature or chemical resistance is higher than NBR can handle.
Can EPDM gaskets be used with diesel or hydraulic oil? No. EPDM is generally not compatible with mineral oil, diesel, or hydraulic oil. Use NBR, FKM, or another oil-resistant rubber material.
What temperature can a rubber gasket withstand? The limit depends on the material. NBR typically handles up to about 100°C continuous. FKM can handle up to about 200°C. Silicone can handle up to about 200°C. EPDM can handle hot water and steam within its rated range.
How do I measure a rubber gasket? Measure the ID, OD, and thickness. If the gasket has bolt holes, also measure the bolt hole diameter and the bolt circle diameter.
Can CORASEALS make custom rubber gasket sizes? Yes. Send the gasket type, material, ID, OD, thickness, temperature, pressure, medium, drawing or sample photo, and quantity. CORASEALS will confirm the material and size options.
