Buna 90 Contoured Back-Up Rings Under 3 Inch Diameter Have Excellent Resistance To Petroleum Products.
Buna 90 Contoured Back-Up Rings under 3-inch diameter provide excellent compression set, tear and abrasion resistance. Buna 90 are the most widely used O-Ring elastomer. Should not be stored in direct sunlight or near motors or other electrical equipment which may generate ozone. Does not have good resistance to ozone, sunlight, or weather, unless specifically compounded. Diameters range from 1/16-2-11/16 inches. Other dimensions vary per model.