Buna O rings have Duro of 70 Standard and possess excellent resistance of temperature from -35 degree to 250 degree. Buna O rings are least expensive and very popular. Buna O rings can be used with air, Water, Oils, Fuels, Gasoline, Brake Engine Coolant, LPG Hydraulic Actuator Seals, Hydraulic Pump Seals, Water Pump Seals Carburetor Seals, and Transmission Seals. Buna O rings have good wear resistance, good compression set resistance, good short-term resilience, good permeation resistance. We are one of the leading manufacturer and exporter of Buna O rings.