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Ecoflex™ 5

PoYo™ Putty vs. Ecoflex™ 5 vs. Smooth-Cast® 310

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 310

PoYo™ Putty vs. Ecoflex™ 5 vs. Smooth-Cast® 310Ecoflex™ 5

Bright White, Ultra Low Viscosity Liquid Plastics

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PoYo™ Putty

PoYo™ Putty vs. Ecoflex™ 5 vs. Smooth-Cast® 310Ecoflex™ 5 versus Smooth-Cast® 310

Mix & Apply-By-Hand Mold Putty

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Tin Cure
Mixed Viscosity13,000 cps80 cpsPutty
Pot Life1 minute20 minutes5 minutes
Cure Time5 minutes4 hours30 minutes
Shore D Hardness70
Shore A Hardness540
ColorTranslucentWhiteLight Pink
Tensile Strength350 psi3,000 psi450 psi
Elongation @ Break1,000 %7.5 %250 %
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™ 5Smooth-Cast® 310PoYo™ Putty
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Tin Cure
Mixed Viscosity13,000 cps80 cpsPutty
Mix Ratio By Volume1A:1B1A:1B20A:1B
Mix Ratio By Weight1A:1B100A:90B100A:6B
Pot Life1 minute20 minutes5 minutes
Cure Time5 minutes4 hours30 minutes
Shore D Hardness70
Shore A Hardness540
Specific Gravity1.07 g/cc1.05 g/cc1.30 g/cc
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.21.31 cu. in./lb.
ColorTranslucentWhiteLight Pink
Die B Tear Strength75 pli85 pli
Tensile Strength350 psi3,000 psi450 psi
Tensile Modulus134,000 psi
Elongation @ Break1,000 %7.5 %250 %
100% Modulus15 psi
Compressive Strength3,800 psi
Compressive Modulus44,900 psi
Flexural Strength4,000 psi
Flexural Modulus118,000 psi
Shrinkage<.001 in. / in.0.0065 in. / in.0.003 in. / in.
Heat Deflection Temp120 °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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Smooth-Cast® 310

The Smooth-Cast® 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. The differences between them are pot life and demold time.

These resins readily accept fillers (such as URE-FIL® 3 from Smooth-On) and can be colored with SO-Strong® or Ignite® color tints (Smooth-Cast® 325 series accepts pigments better than the Smooth Cast® 300 series). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 300 Series Liquid Plastics include reproducing small to medium size sculptures, making prototype models, special effect props and decorative jewelry.

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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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Select a Material from a Category Below

Silicone Rubber - Tin Cure ›

Silicone Rubber - Platinum Cure ›

Urethane Rubber ›

Polysulfide Rubber ›

Urethane Resins ›

Epoxy Casting and Laminating Resins ›

Epoxy Putties ›

Epoxy and Urethane Coatings ›

Mix and Pour Expanding Foams ›

Adhesives ›

Lifecasting Materials ›

Skin Safe FX Materials ›

Polymer Modifiers for Concrete and Gypsum ›