... 4.breaking elongation:about 200% Colored clear silicone stopper as follows: 1.Material: 100 % silicone rubber2.Hardness:between 20~80 shore A3 ... as rubber stoppers for more than 10 years,different kinds of materials are able to be provided for you,such as silicone ... ,EPDM,SBR,NBR,CR,IIR.,BR,NBR,NR,etc,just as per your request. 2)Characteristics:cold resistance,heat ...