TinSil® 70-20 Silicone Rubber

tinsil-70-20TinSil® 70-20 is a 1A:10B mix, tin silicone liquid rubber. It is most useful for making molds for delicate castings because of the soft and flexible characteristics of the cured rubber. TinSil 70-20 has the highest elongation factor of all of the TinSil rubbers.

TinSil 70-20 molds are often used for polyester, polyurethane, and epoxy resin casting as well as wax, plaster, and soap casting. Release agent is not necessary for most casting applications.

This rubber can be poured as supplied or thickened with TinThix liquid thickener to make brush-on molds.

Only available in a 44-lb kit.


Mix Ratio Shore Hardness Pour Time Cured Color Mixed Viscosity Specific Volume Demold Time
1A:10B A20 60 min. Blue 10,000 cP 25.3 in³/lb 16 hr.
Accessories: TinThix Liquid ThickenerSilicone Fluid 50csTinSil FastCat Accelerator


Product Literature: Technical Bulletin | Safety Data Sheets | Physical Properties Bulletin | Sealer & Release Agent Selection Guide

Video Tutorials: For TinSil 70-Series video tutorials, visit the TinSil 70-Series page or the Polytek YouTube Channel.

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