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Ecoflex™ 5

FMC™ 205 vs. Ecoflex™ 5

Super-Soft, Addition Cure Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Polysulfide Rubber
Mixed Viscosity13,000 cps6,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Pot Life1 minute90 minutes
Cure Time5 minutes16 hours
Specific Volume25.8 cu. in./lb.20.1 cu. in./lb.
ColorTranslucentBlack
Tensile Strength350 psi60 psi
Elongation @ Break1,000 %550 %
Disclaimer
Although we do our best to ensure the accuracy of this Compare Tool, Smooth-On offers no warranty either expressed or implied as to the reliability of the information contained herein. Smooth-On assumes no liability for loss or damage associated with use of the Compare Tool. If this is a critical project, we encourage you to review all of the technical data below and contact our Technical Service department with any questions or concerns.

All Technical Data

Ecoflex™ 5FMC™ 205
Product Type
  • Silicone Rubber - Platinum Cure
  • Polysulfide Rubber
Mixed Viscosity13,000 cps6,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:12B
Pot Life1 minute90 minutes
Cure Time5 minutes16 hours
Shore A Hardness512
Specific Gravity1.07 g/cc1.38 g/cc
Specific Volume25.8 cu. in./lb.20.1 cu. in./lb.
ColorTranslucentBlack
Die B Tear Strength75 pli
Tensile Strength350 psi60 psi
Elongation @ Break1,000 %550 %
100% Modulus15 psi15 psi
Shrinkage<.001 in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F

Product Description

Ecoflex™ 5

Ecoflex™ rubbers are platinum-catalyzed silicones that are versatile and easy to use. Ecoflex™ rubbers are mixed 1A:1B by weight or volume and cured at room temperature with negligible shrinkage.  Low viscosity ensures easy mixing and de-airing. Dispense using our convenient dispensing cartridges. Cured rubber is very soft, very strong and very “stretchy”, stretching many times its original size without tearing and will rebound to its original form without distortion.

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FMC™ 205

FMC™-205 is a polysulfide rubber mold compound that cures overnight with negligible shrinkage to a lasting durable rubber that will perform in production. The mix ratio is 100 parts of Part A to 12 parts of Part B by weight. FMC™-205 cures to a Shore hardness of 12 A.

FMC™-205 is ideal for those applications that require capturing intricate detail from a variety of model surfaces. Unlike polyurethanes, FMC™-205 is not sensitive to moisture and can be poured directly over wet plaster or water/sulfur based clays. Common applications include molds of sculpture (lost wax process), casting various gypsum products and waxes. 

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