Specifications

Specifications of silicone compounds used to produce molds

Feature Unit of measurement SK 761 SK 762 SK 764 SK 765 SK 790
Viscosity at 20°C mPa∙s 8000 27000 23000 50000 10000
Operation time at 20°C min 10-15 40
Hardness Shore A 10 28 16 32 31
Tear Strength kN·m-1 3 19 23 25 20
Elongation rate % 400 450 700 530 500
Tensile strength MPa 1,5 3,1 3,7 4,5 4,6
Mixing ratio Net weight 100 to 1,5 - 2,5 1:1
Linear shrinkage % 0,4 0,4 0,3 0,1
Working temperature °С -60 to +250
Density at 20°C g·cm¯³ 1,15 1,35 1,17 1,19 1,09
Storage period month 9
Catalyst   tin platinum

Application of molds at temperatures higher than specified results in loss of mold flexibility.

features of silicon

It is not recommended to use items at temperature higher than +300°C.Produced molds from flexible silicone rubber can be used for a long period at temperatures up to +250°C.

The quantity of catalyst influences on the curing time of mixture. As more catalyst as less curing time.

All silicones from "Silicones SK-76" series (SK-761, SK-762, SK-764, SK-76) can be mixed together in any ratio for getting average characteristics of mixture.

Shrinkage is practically zero.