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Where resin crafting is more than a passion, it is an OBSESSION!

Silicone Mold Making Rubber #3

Alumilite Silicone Mold Making Rubber #3


Product will be back in stock soon. Expected In Stock Date: February 21, 2020
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Alumilite High Strength 3 flexible moldmaking rubber is perfect for making strong, soft, flexible molds, and great for undercut parts. Easy to use silicone rtv cures overnight. Alumilite Silicone is a 10:1 mix ratio and has a 1 hour open time  It demolds in 18 hours and the final mold has a tear strength of 110.  Mold can be used in a temperature range of -67ºF to 392ºF.  Vacuum degassing is not required. Packaged in a 1 lb container.

So what's the difference between the #2 and #3 rubber? The only difference between the two rubbers is the hardness. The High Strength 3 is softer and more flexible making it a better choice for one piece molds that contain deep undercuts or negative drafts. The High Strength 2 has better dimensional stability and is better suited for less undercut one piece molds and for two piece molds due to the stiffer nature of the cured rubber allowing it to line up better with a second half of a two piece mold.

Customer Reviews

Based on 3 reviews
Great product!

I used this for making dice moulds and it’s perfect! Fully cured in just over 20 hours, not sticky or tacky at all, and it’s really durable. 10/10 will purchase again

Alumilite Silicone Mold Making Rubber #3

excellent item makes mold making easy


Worked better than expected, my first time making molds and it’s very easy to use. Make sure you have a sensitive scale singe it’s ratios by weight