Rubber O-ring Made by NBR 70shore A Size :11.2x2.65mm Rubber ... ,ozone resistant,and high adhesive intensity.3.which are in line with standard of HG/T 2196-91 of chemistry of ... .A and JIS ofJapan,and customers' particularity as well.4.Tooling workshop equipment:CNC ,High quality Engraving machine,Electronic flashing machine ... ,aging box,Salt Spray test chamber,Sclerometer,Curometer,etc. O-ring