Rubber o ring Main type: AS 568 Rubber o ring, JIS PG Rubber o ring, GB Rubber o ring. Rubber o ring Characteristic: Bears the high temperature, has extremely good bears the climate, bears the ozone and bears the chemical properties, bears the petroleum. Rubber o ring authentication: USA NSF/FDA; German DVG/KTW; UK WRAS. Rubber o ring uses in astronautics, the automobile, the medical service, the drugs manufacture, the satellite, the valve, pump, the bathroom, the electron, the electric appliance, and so on industry. The precise Rubber o ring surface is smooth, none the needle eye, none the fragments, the precision achieves +/-0.03 mm to +/-0.08 mm.