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Ecoflex™ 5

Ecoflex™ 5 vs. Formlastic™ 48

Super-Soft, Addition Cure Silicone Rubber

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Formlastic™ 48

Ecoflex™ 5 vs. Formlastic™ 48Ecoflex™ 5

Urethane Moldmaking Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Rubber
Mixed Viscosity13,000 cps3,000 cps
Pot Life1 minute25 minutes
Cure Time5 minutes24 hours
Shore A Hardness548
ColorTranslucentWhite
Die B Tear Strength75 pli98 pli
100% Modulus15 psi111 psi
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™ 5Formlastic™ 48
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Rubber
Mixed Viscosity13,000 cps3,000 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:118B
Pot Life1 minute25 minutes
Cure Time5 minutes24 hours
Shore A Hardness548
Specific Gravity1.07 g/cc1.14 g/cc
Specific Volume25.8 cu. in./lb.24.3 cu. in./lb.
ColorTranslucentWhite
Die B Tear Strength75 pli98 pli
Tensile Strength350 psi>700 psi
Elongation @ Break1,000 %1,250 %
100% Modulus15 psi111 psi
Shrinkage<.001 in. / in.<0.001 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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Formlastic™ 48

Formlastic™ 48 urethane is a durable mold rubber made for production casting of concrete. It features a low viscosity for easy mixing and pouring and cures with minimal bubble entrapment. Mix ratio is 1A:1B by volume, pot life is 25 minutes and the rubber cures with an ultimate Shore hardness of Shore 48A. Cured rubber is dimensionally stable (low shrinkage), offers good wear resistance and will render color accurate concrete castings.
IMPORTANT: This product does not contain crystalline silica.

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