TinSil® 70-Series Silicone Rubbers

tinsil-70-seriesThese tin-cured (condensation-cure) silicone mold rubbers are soft to mid-range hardness, high-performance, room temperature curing systems offering excellent flexibility and toughness. Molds can be made from relatively simple models as well as highly detailed models with undercuts.


  • Shore A10 to A60 hardness liquid mold rubbers
  • High-strength
  • Excellent chemical resistance
  • Reproduces finest detail
  • Release agent not necessary for more applications
  • Can be accelerated for rapid cure
  • Ideal for the most demanding resin casting application
  • These rubbers can be poured as supplied or thickened with TinThix liquid thickener for brush-on molds. A brushable/sprayable rubber called TinSil Brush/Spray 25 is available for use by hand or with low cost, portable equipment.

Typical Uses


NOTE: TinSil molds can inhibit the following casting materials: polyurethane rubbers and Poly-Optic 14-Series Casting Resins. This is especially the case in new tin-cured molds. Do not cast platinum-cured silicone in TinSil molds; they will not cure properly. Consider a platinum silicone rubber when using these casting materials.

Product Options

Product Mix Ratio by Weight Shore Hardness Pour Time  Demold Time  Cured Color
TinSil® Gel-10 1A:10B A10 45 min. 16 hr. Translucent
TinSil® 70-11 1A:10B A10 45 min. 16 hr. Blue
TinSil® 70-20 1A:10B A20 60 min. 16 hr. Blue
TinSil® 70-25 1A:10B A25 60 min. 16 hr. Blue
TinSil® Brush/Spray 25 1A:10B A25 30 min. 16-24 hr. Translucent
TinSil® 70-60 5A:100B A60 30 min. 24 hr. Red
Softener Add Silicone Fluid 50cs to TinSil products for a lower-viscosity mix and a softer rubber.
Thickener Add TinThix liquid thickener to thicken the liquid mix for application by brush or trowel.
Accelerator Use TinSil FastCat in place of any TinSil Part A in order to accelerate cure and shorten demold time.


Product Literature

TinSil® 70-Series Technical Bulletin | TinSil® 70-Series Physical Properties Bulletin


Video Tutorials

This video features the making of a poured TinSil 70-25 blanket mold:


This video features the making of a TinSil Brush/Spray 25 (in the TinSil 70-Series) brush-on mold of an uneven rock:


For additional video tutorials, visit the Polytek YouTube Channel you-tube