Common O-Ring Materials
C.R. Chloroprene Rubber(CR) (Neoprene) Resists fats, oils and petroleum products. Stands up well in sunlight. Low flammability - burns when exposed to flames, but self-extinguishes when flame is removed. Generally good ozone, aging and chemical resistance. It has good mechanical properties over a wide temperature range.
Nitrile Butadiene Rubber (N.B.R., Buna N) Nitrile, chemically, is a copolymer of butadiene and acrylonitrile. Acrylonitrile content is varied in commercial products from 18% to 48%. As the nitrile content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases. Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -65 to +275°F(-54 to +135°C), nitrile is the most widely used elastomer in the seal industry today. Inherently nitrile does not possess good resistance to ozone, sunlight or weather, but this can be substantially improved through compounding.
Silicone and Fluoro-Silicone Rubber (Q, MQ, VMQ, FMQ, FVMQ) High and low temperature stability, exceptional release from sticking, resistance to aging, ozone and sunlight, good dielectrics and outstanding water repellency. Applications include electrical insulators, ignition cables, gaskets, O-rings, static seals, oxygen masks, food and medical grade tubing and roll coverings.
Millable Urethanes (AU/EU) Exceptional tensile strength. Abrasion and low temperature resistance. Typical applications include hydraulic seals, gaskets, diaphragms, hoses, and wheels for skate boards.
Fluoro Elastomers, fluorocarbon (Viton®, Fluorel) (FKM) For extreme heat resistance-temperatures ranging to +500°F. Resistance to abrasion, oil and chemicals is outstanding. Good resistance to ozone, weathering and flame. Main uses are as O-rings, shaft seals, gaskets, fuel hoses, diaphragms, and cable sheathing for extreme conditions.
Perfluoroelastomer (FFKM) o-rings are recommended for their vast temperature range, chemical resistance in numerous aggressive applications, and long service life. Global O-Ring and Seal provides high-performance FFKM o-rings for your demanding applications.
Ethylene Propylene Diene Terpolymer (EPDM) Excellent in water, steam, heat, weather, detergents, ozone and many chemicals. Applications include O-rings, gaskets, window and door seals, wire and cable insulation, under-hood applications, hoses, and waterproofing sheets.
TFE Propylene (Aflas) TetrafluoroethylenePropylene Rubbers This elastomer is a copolymer of Tetrafluoroethylene (TFE) and propylene. Its chemical resistance is excellent across a wide range of aggressive media.
PTFE (polytetrafluoroethylene) This compound is impervious to virtually all fluids and gasses ranging from -320°F to 450°F Only molten alkaline metals and certain halogenated compounds will attack it.