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 perfect for automotive, medical, and gasket applications, as well as custom molds and soft rubber parts. Its low viscosity ensures incredible detail reproduction, and vacuum or pressure casting is recommended for bubble-free results.

Whether you need a highly flexible rubber for gaskets, medical parts, or intricate molds, Flex 20 delivers precision, durability, and ease of use! 

Features

✅ Smooth, Detailed Castings:

Low viscosity allows for excellent detail reproduction

✅ Bubble-Free Results:

Vacuum or pressure casting recommended for best quality

✅ Customizable Colors:

Mix with Alumilite translucent dyes, and add white dye for opaque colors
✅ Fast Demold Time:

Ready to demold in 2 hours, full cure in 72 hours

✅ Versatile & Flexible:

Ideal for automotive parts, soft molds, gaskets, and prototypes

✅ Minimal Shrinkage:

Ensures high accuracy and precise castings

🚫 Not as rigid as higher shore rubbers like Flex 50, 70, or 80

✅ Flex 20 is the softest and most flexible in the Flex Series, with a 20A shore hardness, making it perfect for gaskets, prosthetics, and ultra-flexible molds. It provides maximum stretch and detail without tearing.

Can Flex 20 be used for wearable applications?

🚫 No, Flex 20 is not certified for skin or body contact and should not be used for wearable items like prosthetics or masks.

What’s the best way to mix and pour Flex 20?

🎨 Mix at a 1:1 ratio by weight or volume, stir thoroughly, and pour slowly to reduce air bubbles. If possible, use a vacuum chamber for best results.