Model Appearance Viscosity(cs) Hardness(A°) Tensile Strength(kgf/cm) Tear Strength(KN/cm) Elongation(%) Mixing Ratio(%) Operating Time(H/250C) Curing Time(H/250C) HY 625 white 20000±1000 25±2 36±2 22±2 500 2~3 0.5 4~6 HY 638 white 23000±2000 34±2 49±2 23±2 470 2~3 0.5 4~6 Any questions of liquid molding silicone rubber, please feel free to contact Ms Ivy : Mob: +86-15986607592 Skype: ivyLiu78