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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 300Q

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 300Q

Ecoflex™ 5 vs. Smooth-Cast® 300QEcoflex™ 5

Bright White, Ultra Low Viscosity Liquid Plastic

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps
Pot Life1 minute30 seconds
Shore D Hardness70
Shore A Hardness5
ColorTranslucentWhite
Tensile Strength350 psi3,000 psi
Elongation @ Break1,000 %5 %
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® 300Q
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:90B
Pot Life1 minute30 seconds
Cure Time5 minutes5 minutes
Shore D Hardness70
Shore A Hardness5
Specific Gravity1.07 g/cc1.05 g/cc
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.
ColorTranslucentWhite
Die B Tear Strength75 pli
Tensile Strength350 psi3,000 psi
Tensile Modulus139,500 psi
Elongation @ Break1,000 %5 %
100% Modulus15 psi
Compressive Strength4,000 psi
Compressive Modulus45,800 psi
Flexural Strength4,510 psi
Flexural Modulus128,000 psi
Shrinkage<.001 in. / in.0.01 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® 300Q

 

Smooth-Cast® 300Q liquid plastic is a quick setting, ultra-low viscosity casting resin that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. It offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. 

This resin 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. It resists moisture and mild solvents. Applications for Smooth-Cast® 300Q Liquid Plastics include reproducing small to medium size sculptures, casting into alginate molds, making prototype models, special effect props and decorative jewelry. 

Those interested in making roto cast pieces should refer to the Smooth-Cast® 65D technical bulletin.

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