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Ecoflex™ 5

Ecoflex™ 5 vs. PMC®-744 vs. Smooth-Cast® 310

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 310

Ecoflex™ 5 vs. PMC®-744 vs. Smooth-Cast® 310Ecoflex™ 5

Bright White, Ultra Low Viscosity Liquid Plastics

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PMC®-744

Ecoflex™ 5 vs. PMC®-744 vs. Smooth-Cast® 310Ecoflex™ 5 versus Smooth-Cast® 310

Polyurethane Rubber Compound

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps80 cps3,400 cps
Pot Life1 minute20 minutes15 minutes
Cure Time5 minutes4 hours16 hours
Shore D Hardness70
Shore A Hardness544
ColorTranslucentWhiteBeige
Tensile Strength350 psi3,000 psi300 psi
Elongation @ Break1,000 %7.5 %400 %
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® 310PMC®-744
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps80 cps3,400 cps
Mix Ratio By Volume1A:1B1A:1B2A:1B
Mix Ratio By Weight1A:1B100A:90B2A:1B
Pot Life1 minute20 minutes15 minutes
Cure Time5 minutes4 hours16 hours
Shore D Hardness70
Shore A Hardness544
Specific Gravity1.07 g/cc1.05 g/cc1.01 g/cc
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.27.5 cu. in./lb.
ColorTranslucentWhiteBeige
Die B Tear Strength75 pli
Die C Tear Strength90 pli
Tensile Strength350 psi3,000 psi300 psi
Tensile Modulus134,000 psi
Elongation @ Break1,000 %7.5 %400 %
100% Modulus15 psi90 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.< .001 in. / in.
Heat Deflection Temp120 °F
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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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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PMC®-744

PMC®-744 has been used for years by mold making professionals to cast plaster, concrete, resins, etc. It is excellent for making molds that are strong, durable and dimensionally stable. Low viscosity ensures fine detail reproduction.

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