rubber o ring,high quality,wide temprature range,odorless SRgood resilience, ... resistance,ozone resistance,acid resistance,alkali resistance,alkali resistance,good flex performamnce at low temprature.CRhigh tensile strength,good tearing ... good tearing property,abrasion resistance,ageing resistance,ozeone resistance,good flex performance at low temprature,perfect electrical performance,acid resistance, ...