Rubber gasket creates a seal between two parts. It prevents dirt, gas, dust or fluid from leaking out of or into its joining.
Rubber gasket is a mechanical seal. It has excellent compressibility, resilience, expansibility, anti-permeability and easy assembly and disassembly. So rubber gasket is widely used in aerospace, petrochemical and architecture industries.
In addition, rubber gasket are available in five common materials including EPDM, NBR, neoprene, viton and silicone.
EPDM (Ethylene Propylene Diene Monomer) is an extremely durable synthetic rubber elastomer. EPDM offers excellent resistance to UV, heat, ozone, chemicals, animal and vegetable oils and harsh weather. Stable in low and high temperatures, this material has a service range of -40 °F to 212 °F and is intermittent to 275 °F.
Because of its excellent performance, EPDM gasket is typically used for automotive seals and marine seals.
NBR (Nitrile-Butadiene Rubber), also known as Buna-N, is a copolymer of butadiene and acrylonitrile. This synthetic rubber material is resistant to various solvents, hydraulic fluids, animal and vegetable oils and aromatic fuels. In addition, The acrylonitrile content of nitrile sealing compounds varies considerably (18% to 50%) and influences the physical properties of the finished material. The higher the acrylonitrile content, the better the resistance to oil and fuel. Together with good elongation properties, as well as adequate resilience, tensile and compression set, these advantages make NBR gasket ideal for applications where resistance to oils, solvents and fuels.
Neoprene is a synthetic rubber made of polymerized chloroprene. It is generally black in color with smooth finish.
Neoprene is a flame-retardant material that can also resist the effects of oils, chemicals, oxygen and ozone. In addition, it offers moderate resistance to petroleum products. Because of its excellent properties, neoprene gasket is widely used in industrial and harsh environments.
Viton, also known as fluororubber, is a fluorocarbon-based synthetic rubber that provide outstanding resistance to heat and oil as well as resistance to a wide range of concentrated acids bases. Additionally, it also has good tensile strength, resilience and low compression set.
This material can perform optimally in the most extreme conditions. Viton has a maximum operating temperature from 400 °F (continuous) to 500 °F (intermittent).
Silicone is composed of polymerized siloxanes and it is an extremely soft and adaptable material.
Silicone gasket boasts superior elastomeric properties at both high and low temperatures and is resistant to the effects of ozone, oxygen, aging, UV and extreme weather conditions. At the same time, Silicone gaskets provide extremely good electrical insulation properties. What's more, it is non-toxic, tasteless, odorless and chemically-inert which means they are a suitable choice for sanitary applications.