High Strength 3

(3 reviews) Write a Review

High Strength 3 is our most flexible tin-based silicone mold making rubber – it’s great for making molds of parts with deep undercuts or negative space.

  • Doesn’t require degassing, but recommend when possible
  • Picks up exact detail of original part

Prior to using product, please read all Technical Data, Safety Data, and Instruction sheets linked below.

$27.50 - $165.50

Technical Specifications

High Strength 3
Mix Ratio:
10:1 by weight
Pot Life:
45 minutes
Demold Time (100 gram mass):
12-18 hours
Mixed Viscosity (cps):
15,000 at 130º F
Specific Gravity:
Shore Hardness (ASTM D2240):
8-10 A
Tear Strength (ppi):
Linear Shrinkage:
Tensile Strength (ASTM D638, psi):
Elongation (in./in.):
Temperature Resistance:
-67º to 395º F


  • 5
    High strength 3

    Posted by Andrew Heicher on Dec 2nd 2020

    Works very well for making model railroad loads and parts.

  • 5
    Great multipurpose silicone

    Posted by Ashley Taylor on Sep 24th 2020

    I use this for dice, works great for the small details. Has quite a few uses before it starts to break down. Easy to use and flexible enough for most molds!

  • 5
    making a mold to recreated a "character" in clay

    Posted by Stuart Glassman on Jun 27th 2020

    Easy to use. It worked exactly as promised. I've already ordered more.