B14-1 REVISED OCTOBER, 2012 © Copyright 2023. All rights reserved. No portion may be copied or reproduced in any manner. O-RINGS SOSMETAL PRODUCTS INC. FITTINGS/HYDRAULICS/HOSE B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 B20 B21 Ethylene has won broad acceptance in the selling world because of its excellent resistance to Skydrol and other phosphate ester type hydraulic fluids. Ethylene propylene has a temperature range of - 65° to +300°F (-54° to +150°C) for most applications. EP is recommended for: l Phosphate ester base hydraulic fluids (Skydrol, Fyrquel, Pydraul). l Steam (to 500°F) (260°C). l Water. l Silicone oils and greases. l Dilute acids. l Dilute alkalies. l Ketones (MEK, acetone). l Alcohols. l Automotive brake fluids. FOR NON-PETROLEUM BASED FLUIDS Fluorocarbon elastomers were first introduced in the mid-1950’s. Since then they have grown to major importance in the seal industry. Due to wide spectrum chemical compatibility and temperature range, fluorocarbon rubber is the most significant single elastomer development in recent history. Its working temperature range is considered to be from -20° to +400°F (-29° to +204°C) but it will take temperatures up to 600°F (316°C) for short periods of time. It has been known to seal at -65°F (-54°C) in some static applications. Newer developments have tremendously improved the compression set characteristics of this very useful material. Compounds made from fluorocarbon elastomers should be considered for use in aircraft, automotive and other mechanical devices requiring maximum resistance to deterioration by test and functional fluids. Fluorocarbon is recommended for: l Petroleum oils. l Di-ester base lubricants (MIL-L-7808, MIL-L-6085). l Silicate ester base lubricants (MLO 8200, MLO 8515, OS-45). l Silicone fluids and greases. l Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene). l Selected phosphate ester fluids. l Acids. FOR MAXIMUM TEMPERATURE AND CHEMICAL RESISTANCE 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. Most military rubber specifications for fuel and oil resistant MS and AN O-rings require nitrile base compounds. It should be mentioned, however, that to obtain good resistance to low temperature with nitrile compounding, it is almost always necessary to sacrifice some high temperature fuel and oil resistance. Nitrile compounds are superior to most elastomers with regard to compression set or cold flow, tear, and abrasion resistance. Inherently, they do NOT possess good resistance to ozone, sunlight or weather but this has been substantially improved through compounding. Nitrile is recommended for: l General purpose sealing. l Petroleum oils and fluids. l Water. l Silicone greases and oils. l Di-ester base lubricants (MIL-L-7808). l Ethylene glycol base fluids (Hydrolubes). MOST POPULAR GENERAL PURPOSE O-RING APPLICATION GUIDE Used for sealing in valves, faucets, transmissions, compressors, cylinders, and flanges. Also used for small drive belts. • Four thicknesses available: 1/16, 3/32, 1/8, 3/16 – THREE COMPOUNDS AVAILABLE – CHEMICAL/FLUIDS RESISTANCE TEMPERATURE RANGE • A “Durometer” rating is a hardness rating of any O-Ring material. A “Durometer” rating of 70 is the accepted industry standard. BUNA-N-70 DUROMETER (NITRILE) BLACK VITON-75 DUROMETER (FLUOROCARBON) BLACK ETHYLENE PROPYLENE 70 DUROMETER (EPR, EPDM) BLACK 1/16’’ 3/32’’ 1/8’’ 3/16’’ THICKNESS GAUGE COMPOUND °F °C Buna-N (Nitrile) -65° to+ 300° -54° to +135° Ethylene -65° to+ 300° -54° to +135° Propylene Viton (Fluorocarbon) -20° to +400° -29° to +204° P-POOR G-GOOD F-FAIR E-EXCELLENT BUNA-N VITON EPDM Ozone resistance P E E Weather resistance F E E Heat resistance G E E Chemical resistance FG E E Oil resistance E E P Impermeability G G G Cold resistance G FP GE Tear resistance FG F GE Abrasion resistance G G GE Set resistance GE GE GE Dynamic resistance GE GE GE Acid resistance F E G Tensile strength GE GE GE Electrical properties F F G Water/steam resistance FG FG G Flame resistance P E P O-RING RECOMMENDATIONS FOR VARIOUS FLUIDS AND CHEMICALS BUNA-N VITON EPDM Water • • Petroleum oils & fluids • • Silicone greases & oils • • • Di-ester based lubricants • • Ethylene glycol based fluids • Phosphate ester based • hydraulic fluids Steam (to 400° F; 204°C) • Diluted acids • Acids • Diluted alkalies • Ketones • Alcohols • Automobile brake fluids • Silicone ester based lubricants • Halogenated hydrocarbons •
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