Machinery's Handbook, 31st Edition
O-RINGS
2689
Table 13. Typical O-Ring Compounds
General-purpose compound for use with most petroleum oils, greases, gasoline, alcohols and glycols, LP gases, propane and butane fuels. Also for food service to resist vegetable and animal fats. Effective temperature range is about − 40 ° to 250 ° F (–40 to 121 ° C). Excellent compression set, tear and abrasion resistance, but poor resistance to ozone, sunlight and weather. Higher-temperature nitrile compounds with similar properties are also available. Similar to general-purpose nitrile compounds with improved high-temperature performance, resistance to aging, and petroleum product compatibility. General-purpose compound with low compression set and good resistance to elevated temperatures. Good resistance to sunlight, ozone, and weathering, and fair oil resistance. Frequently used for refrigerator gases such as Freon. Effective temperature range is about − 40 ° to 250 ° F (–40 to 121 ° C). General-purpose compound with excellent resistance to polar fluids such as water, steam, ketones, and phosphate esters, and brake fluids, but not resistant to petroleum oils and solvents. Excellent resistance to ozone and flexing. Recommended for belt-drive applications. Continuous duty service in temperatures up to 250 ° F (121 ° C). Widest temperature range ( − 150 ° to 500 ° F or –101 to 260 ° C) and best low-temperature flexibility of all elastomeric compounds. Not recommended for dynamic applications, due to low strength, or for use with most petroleum oils. Shrinkage characteristics similar to organic rubber, allowing existing molds to be used. Toughest of the elastomers used for O-rings, characterized by high tensile strength, excellent abrasion resistance, and tear strength. Compression set and heat resistance are inferior to nitrile. Suitable for hydraulic applications that anticipate abrasive contaminants and shock loads. Temperature service range of − 65 ° to 212 ° F (–54 to 100 ° C). Wide temperature range ( − 80 ° to 450 ° F or –62 to 232 ° C) for continuous duty and excellent resistance to petroleum oils and fuels. Recommended for static applications only, due to limited strength and low abrasion resistance. Heat resistance better than nitrile compounds, but inferior low temperature, compression set, and water resistance. Often used in power steering and transmission applications due to excellent resistance to oil, automatic transmission fluids, oxidation, and flex cracking. Temperature service range of − 20 ° to 300 ° F (–29 to 149 ° C). General-purpose compound suitable for applications requiring resistance to aromatic or halogenated solvents or to high temperatures ( − 20 ° to 500 ° F or –29 to 260 ° C with limited service to 600 ° F or 316 ° C). Outstanding resistance to blended aromatic fuels, straight aromatics, and halogenated hydrocarbons and other petroleum products. Good resistance to strong acids (temperature range in acids ( − 20 ° to 250 ° F or –29 to 121 ° C), but not effective for use with very hot water, steam, and brake fluids.
Nitrile
Hydrogenated Nitrile
Polychloroprene (Neoprene)
Ethylene Propylene
Silicone
Polyurethane
Fluorosilicone
Polyacrylate
Fluorocarbon (Viton)
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