151 www.BMRS.net Technical Information The appropriate selection of 'O' Ring material is important. Failure to select the correct material may lead to a shortened service life or, in an extreme case, seal failure. The following table is offered as a guide only, the information is not intended to be comprehensive. Operating conditions, temperature and fluid combinations should be taken into account when selecting the material. For specific application advice please consult the factory. 'O' Ring Guide 'O' Ring Material Code 'O' Ring Material Temperature Range Application Recommended for: NOT Recommended for: 'N' Nitrlle (Buna N) -40°C to + 135°C -40°F to + 275°F Mineral Based Hydraulic Oils & Greases Engine Oils SAE 10 to 50 & Multi-grades Pneumatics Cold Water Silicone Oils & Greases Ethytene Glycol Based Fluids (Anti-Freeze) Di-Ester Based Lubricants Gasoline Nitrous Oxide Brake Fluid Phosphate Ester Hydraulic Fluids Ketones (Acetone) 'V' Flurocarbon -25°C to + 250°C -13°F to + 482°F Mineral Based Hydraulic Oils & Greases Engine Oils SAE 10 to 50 & Multi-Grades Pneumatics Di-Ester Based Lubricants Phosphate Ester Hydraulic Fluids Silicate Ester Base Lubricants Silicone Oils & Greases Gasoline Aviation Fuels High Temperature Air Brake Fluid Ketones (Acetone) 'EP' Ethylene Propylene -54°C to + 135°C -65°F to + 275°F Brake Fluid Water (Hot & Cold) Phosphate Ester Hydraulic Fluids Methanol Nitromethane Nitrous Oxide Ketones (Acetone) Petroleum Oils Di-Ester Base Lubricants Pressure Units Cross Reference Chart lbs/in² STD atms. at 20°C Ft. Hd. H20 in. H20 kg/cm² Metres H20 in. Hg. at 20°C mm Hg. at 20°C cm Hg. bar Millibar (mb) kPa 1 0.068 2.310 27.720 0.70 0.703 2.043 51.884 5.188 0.069 68.947 6.895 14.696 1 33.959 407.513 1.033 10.351 30.019 762.483 76.248 1.013 1013.25 101.325 0.433 0.029 1 12.000 0.030 0.304 0.884 22.453 2.245 0.030 29.837 2.984 0.036 0.003 0.083 1 0.003 0.025 0.074 1.871 0.187 0.030 2.486 0.249 14.223 0.968 32.867 394.408 1 10.018 29.054 737.962 73.796 0.981 980.665 98.066 1.422 0.097 3.287 39.370 0.099 1 2.905 73.796 7.379 0.098 98.066 9.807 0.489 0.033 1.131 13.575 0.034 0.344 1 25.400 2.540 0.034 33.753 3.375 0.019 0.001 0.045 0.534 0.001 0.013 0.039 1 0.100 0.001 1.333 0.133 0.193 0.013 0.445 5.340 0.014 0.136 0.395 10.326 1 0.013 13.333 1.328 14.503 0.987 33.514 402.164 1.020 10.196 29.626 752.472 75.251 1 1000.0 100.00 0.014 0.001 0.033 0.402 0.001 0.010 0.030 0.753 0.075 0.001 1 0.100 0.145 0.010 0.335 4.021 0.010 0.102 0.296 7.525 0.753 0.010 10.000 1