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Rubber Gaskets for Industrial Sealing: Materials, Dimensions, and Custom Quotes
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.
What Is a Rubber Gasket?
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.
Rubber Gasket Materials
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.
Rubber Gasket Dimensions and Tolerances
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 d