Most Common O-Ring Elastomers
NITRILE (Buna N) – Nitrile formulations exhibit good mechanical and physical properties. They are resistant to most non-aromatic petroleum-based fluids and gases, and have been used in most industrial, automotive, and off-the-road equipment for many years. Their usable temperature range is -65°F to +225°F.
FLUROCARBON (Viton¹ and Fluorel²) – These versatile elastomers have excellent mechanical and physical properties, and outstanding resistance to aromatic fuels, high temperature synthetic lubricants, and many of the new fire resistant industrial fluids. They can withstand prolonged exposure to temperatures of 450°F in fluid service and limited exposure to much higher temperatures.
CHLOROPRENE (Neoprene¹) – These elastomers have moderate resistance to petroleum based oils over a temperature range of -65°F to +250°F, and good resistance to weathering and ozone.
SILICONE – Silicone materials are recommended for applications requiring a wide temperature range and good dry heat resistance. Their temperature range is from -80°F to +450°F, the widest of any commercial elastomer. They also have good weathering and ozone resistance, and moderate oil resistance.
ETHYLENE PROPYLENE – These elastomers first came into prominent usage as seals for Skydrol fluids used in commercial aircraft hydraulic systems. Ethylene propylene compounds have grown in importance over the past few years, and now are used in systems involving hot water, steam, and phosphate ester fluids. They are also resistant to mild acids, alkalis, and ozone. Their effective temperature range is -65°F to +300°F.
FLUOROSILICONE – These elastomers have outstanding aging properties over a temperature range of -100°F to +400°F. In addition to excellent heat and low temperature flexibility, these rubbers have very good oil and fuel resistance, low compression set and good electrical properties. Also excellent resistance to ozone and weathering.
POLYURETHANE – Exhibit outstanding toughness and abrasion resistance. Good resistance to petroleum oils, hydrocarbon fuels, oxygen, ozone and weathering over a temperature range of -40°F to +200°F. Can be manufactured either from millable gums or cast from liquid versions.