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Flex 20 is a soft yet tough urethane rubber designed for high-detail casting, prototyping, and mold-making. With a shore hardness of 20A, it offers maximum flexibility while maintaining excellent tear strength and durability. This makes it ...
Reviews
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Diorama mold making
Very happy with the product , worked as I had hoped.
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Jaan · May 10, 2026
Our go to urethane
If you are looking for a urethane that performs well with super fast demould times any of the Flex series are excellent. They perform consistently every time. We've (carefully) demoulded in as little as an hour and never had a problem with curing.
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Jason · January 20, 2026
Exactly what I was looking for-for my project. My only wish would be that it doesn’t set as quickly so I had more working time. But that’s more on me lol this stuff is great.