Alumilite entire line of Flex systems ranging in hardness from soft flexible urethane rubber (20A) for automotive, medical, and gasket applications all the way to very hard durometers (80A) used for industrial rollers, nests, fixtures, and bumpers in a wide variety of industries.The Flex line of urethane elastomers are extremely tough, yet extremely easy to use.

See Description below for 30A and 40A blending.

Note: For Flex 50, 60, 70, and 80, because they are translucent yellow, white dye must be used in combination with other translucent color dyes to produce opaque castings.


Prior to use, read all Technical Data Sheets/Instructions and Safety Data Sheets linked below.

Price: $36.00-98.00
Availability: In Stock
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    Note: Alumilite products also available in bulk sizes ... 5 gallons, drums, and totes. Call 800-447-9344


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    Note: Alumilite products also available in bulk sizes ... 5 gallons, drums, and totes. Call 800-447-9344


    The low viscosity of the Flex systems allow for excellent detail and part reproduction.Although vacuum or pressure assistance is recommended for casting perfectly bubble free/dense parts every time, it is not required when pouring simple parts.The materials feature a 4-5 minute work time and a demold time of 1-2 hours at room temperature (depending on mass).Post curing the parts at 150 degrees F will accelerate the cure and demold time.Full cure is 72 hours.Alumilite’s Flex series are also great for making flexible rubber molds for resin, concrete, plaster, silicone and more.Mold release is required when using the Flex line to ensure the Flex systems do not bond.

    Blending to create a Flex 30:Measure and mix 50% Flex 20 A with 50% Flex 50 A side.Then measure and mix 50% Flex 20 B side with 50% Flex 50 B side.Once both sides have been combined, simply mix the new Flex 30 A side 1:1 by weight or volume with the new Flex 30 B side to create a 30 Shore A hardness.

    Blending to create a Flex 40:Measure and mix 25% Flex 20 A with 75% Flex 50 A side.Then measure and mix 25% Flex 20 B side with 75% Flex 50 B side.Once both sides have been combined, simply mix the new Flex 40 A side 1:1 by weight or volume with the new Flex 40 B side to create a 40 Shore A hardness.

    Product Flex 20 Flex 50 Flex 60 Flex 70 Flex 80
    Color Ivory Translucent Yellow Translucent Yellow Translucent Yellow Translucent Yellow
    Mix Ratio 1:1 by WEIGHT 1:1 by WEIGHT 1:1 by WEIGHT 1:1 by WEIGHT 1:1 by WEIGHT
    Open Time 4-5 min. 4-5 min. 4-5 min. 4-5 min. 4-5 min.
    Demold Time (100 gr. Mass) 1-2 hours 1-2 hours 1-2 hours 1-2 hours 1-2 hours
    Mixed Viscosity (cps.) 520 550 625 680 1600
    Specific Gravity 1.01 1.03 1.03 1.05 1.06
    Shore A Hardness (ASTM D-2240) 20A 50A 60A 70A 80A-85A
    Tear Strength (ppi) 50 50 70 130 190
    Tensile Strength (ASTM D-638) (psi) 250 250 345 730 1332
    Elongation (in./in.) 770% 200% 235% 175% 250%
    Linear Shrinkage (in./in.) 0.005 0.002 0.0026 0.0041 0.013
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