... Seal ring,seal circle,rubber seal ring2)AS568, JIS B 2401, Hardnes50-90 SHOREColors: black, blue, brown, green, red,white, purpleROHS ... approvedHardness:60-90shoreStandard,: 1.JIS B 2401 2. AS568A 3. GB /T3452.11)Rubber O-RING NBR ... Seal ring,seal circle,rubber seal ring2)AS568, JIS B 2401, Hardnes50-90 SHOREColors: black, blue, brown, green, red, white, purpleROHS ...