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ReoFlex™ 40

FMC™ 200 vs. ReoFlex™ 40

'Next Generation' Urethane Rubber

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Key Differences

Product Type
  • Urethane Rubber
  • Polysulfide Rubber
Mixed Viscosity1,500 cps6,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Pot Life30 minutes50 minutes
Shore A Hardness4020
Specific Volume27.2 cu. in./lb.20.5 cu. in./lb.
ColorOff WhiteBlack
Tensile Strength490 psi157 psi
Elongation @ Break1,000 %700 %
100% Modulus73 psi29 psi
Disclaimer
Although we do our best to ensure accuracy, Smooth-On offers no warranties, promises, and/or representations of any kind, either expressed or implied, as to the accuracy, completeness, or reliability of the information contained on this Compare Tool, nor suitability of the information contained herein to your particular circumstances. Smooth-On assumes no liability for losses or damages of whatever nature (direct, indirect, consequential or other) associated with your use, or inability to use, the Compare Tool, or from your use (or failure to use) the information contained herein. Other useful tools include product technical bulletins and our extensive FAQ section. You can also contact our technical support team.

All Technical Data

ReoFlex™ 40FMC™ 200
Product Type
  • Urethane Rubber
  • Polysulfide Rubber
Mixed Viscosity1,500 cps6,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:12B
Pot Life30 minutes50 minutes
Cure Time16 hours16 hours
Shore A Hardness4020
Specific Gravity1.02 g/cc1.35 g/cc
Specific Volume27.2 cu. in./lb.20.5 cu. in./lb.
ColorOff WhiteBlack
Die C Tear Strength85 pli
Tensile Strength490 psi157 psi
Elongation @ Break1,000 %700 %
100% Modulus73 psi29 psi
Shrinkage<.001 in. / in.negligible in. / in.

Product Description

ReoFlex™ 40

ReoFlex™ urethane rubbers offer superior physical and performance properties for production casting of wax, plasters, and resins. ReoFlex™ urethanes are available in 20A, 30A, 40A, 50A and 60A Shore hardnesses and feature convenient one-to-one by volume mix ratios. Vacuum degassing is not necessary and ReoFlex™ rubbers cure with negligible shrinkage to a durable rubber that will last in production. ReoFlex™ “Wet” rubbers will shrink somewhat over time vs. “Dry” formulations.

ReoFlex™ mold rubbers are used for a variety of applications including making molds to reproduce sculpture and architectural elements, as well as for making special effects, toys and prototypes. Vibrant colors can be achieved by adding So-Strong™ Color Tints, available from Smooth-On.

Casting Concrete? Look into the VytaFlex™ series of urethane mold rubbers. VytaFlex™ urethanes were formulated specifically for casting concrete / pigmented concrete and feature Smooth-On’s exclusive ‘V-Polymer™’ technology.

FOR COMMERCIAL/INDUSTRIAL USE ONLY

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FMC™ 200

FMC™-200 is a polysulfide rubber mold compound with high tear strength that cures overnight with negligible shrinkage. Molds made of FMC™-200 are very durable and will perform in production. The mix ratio is 100 parts of Part A to 12 parts of Part B by weight. FMC™-200 cures to a Shore hardness of 20 A.

FMC™-200 is ideal for those applications that require capturing intricate detail from a variety of model surfaces. Unlike polyurethanes, FMC™-200 is not sensitive to moisture and can be poured directly over wet plaster or water/sulfur based clays. Common applications include molds for foundry and pattern work, sculpture (lost wax process), casting various gypsum products and waxes.

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