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Ecoflex™ 5

PoYo™ Putty vs. Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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EpoxAcast™ 650 + 102 Hardener

PoYo™ Putty vs. Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5

Mineral Filled General Purpose Casting Epoxy

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PoYo™ Putty

PoYo™ Putty vs. Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 650 + 102 Hardener

Mix & Apply-By-Hand Mold Putty

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Silicone Rubber - Tin Cure
Mixed Viscosity13,000 cps7,000 cpsPutty
Mix Ratio By Volume1A:1BN/A (gram scale required)20A:1B
Pot Life1 minute90 minutes5 minutes
Cure Time5 minutes4 hours30 minutes
Barcol 935 Hardness93
Shore A Hardness540
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.21.31 cu. in./lb.
ColorTranslucentOff WhiteLight Pink
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™ 5EpoxAcast™ 650 + 102 HardenerPoYo™ Putty
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Silicone Rubber - Tin Cure
Mixed Viscosity13,000 cps7,000 cpsPutty
Mix Ratio By Volume1A:1B20A:1B
Mix Ratio By Weight1A:1B100A:13B100A:6B
Pot Life1 minute90 minutes5 minutes
Cure Time5 minutes4 hours30 minutes
Barcol 935 Hardness93
Shore A Hardness540
Specific Gravity1.07 g/cc1.52 g/cc1.30 g/cc
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.21.31 cu. in./lb.
ColorTranslucentOff WhiteLight Pink
Die B Tear Strength75 pli85 pli
Tensile Strength350 psi450 psi
Tensile Modulus1,503,000 psi
Ultimate Tensile6,000 psi
Elongation @ Break1,000 %250 %
100% Modulus15 psi
Compressive Strength16,350 psi
Compressive Modulus142,600 psi
Flexural Strength5,890 psi
Flexural Modulus710,000 psi
Shrinkage<.001 in. / in.0.001 in. / in.0.003 in. / in.
Heat Deflection Temp129 °F
Useful Temperature (min)-65 °F-65 °F
Useful Temperature (max)450 °F400 °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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EpoxAcast™ 650 + 102 Hardener

EpoxAcast™ 650 is a mineral filled general purpose casting epoxy that is low cost and versatile. It features a low mixed viscosity for minimal bubble entrapment.

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PoYo™ Putty

PoYo™ Putty 40 is a two-component mold making silicones (tin catalyst) that can be mixed and applied “on site” – directly to almost any model. PoYo™ Putty will hold any vertical surface and capture even the finest detail - perfect for making strong rubber molds that can be used within minutes. 

 PoYo™ Putty has been used to make molds of valuable antiques and archeological models and can be used to make fast molds of sculpture, prototypes, candles, picture frames, coins, etc. You can cast wax, gypsum and a variety of resins into PoYo™ Putty molds.

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