620 and 625 is a kind of silicone rubber, which are both suitable for making molds, with the material of resin, gypsum and plaster.
Model: 625#
Viscosity (cp): 20000~21000
Hardness (A): 25±2
Tensile Strength (kgf/cm2): ≥35
Tear Strength (kgf/cm): ≥25
Elongation (%): ≥500
Mixing ratio (%): 100:5
Operating Time(H): 0.5
Curing Time(H): 2-5
Model: 628#
Viscosity (cp): 22000~24000
Hardness (A): 28±2
Tensile Strength (kgf/cm2): ≥35
Tear Strength (kgf/cm): ≥25
Elongation (%): ≥470
Mixing ratio (%): 100:5
Operating Time(H): 0.5
Curing Time(H): 2-5
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Post time: Jun-23-2017