... resistance,heat resistance,ozone resistance,acid resistance,alkali resistance,alkali resistance,good flex performamnce at low temprature.CR ... at low temprature,perfect electrical performance,acid resistance,alkali resistance.NR: high tensile strength,good tearing property ... resistance,UV-resistance ,Ozone resistance,Abrasion resistance Color: Black,white, Transparent,gray,green,yellow,blue,red etc. ...