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Ecoflex™ 5

Smooth-Cast® 300 vs. Ecoflex™ 5 vs. TASK™ 14

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 14

Smooth-Cast® 300 vs. Ecoflex™ 5 vs. TASK™ 14Ecoflex™ 5

Semi-Rigid Black Urethane Casting Resin

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Smooth-Cast® 300

Smooth-Cast® 300 vs. Ecoflex™ 5 vs. TASK™ 14Ecoflex™ 5 versus TASK™ 14

Bright White Liquid Plastic

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps800 cps80 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute10 minutes3 minutes
Cure Time5 minutes45 minutes10 minutes
Shore D Hardness5070
Shore A Hardness5
ColorTranslucentBlackWhite
Tensile Strength350 psi1,800 psi3,000 psi
Elongation @ Break1,000 %125 %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™ 5TASK™ 14Smooth-Cast® 300
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps800 cps80 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:120B100A:90B
Pot Life1 minute10 minutes3 minutes
Cure Time5 minutes45 minutes10 minutes
Shore D Hardness5070
Shore A Hardness5
Specific Gravity1.07 g/cc1.15 g/cc1.05 g/cc
Specific Volume25.8 cu. in./lb.24.1 cu. in./lb.26.4 cu. in./lb.
ColorTranslucentBlackWhite
Die B Tear Strength75 pli
Tensile Strength350 psi1,800 psi3,000 psi
Tensile Modulus139,500 psi
Elongation @ Break1,000 %125 %5 %
100% Modulus15 psi
Compressive Strength4,000 psi
Compressive Modulus45,800 psi
Flexural Strength4,510 psi
Flexural Modulus128,000 psi
Shrinkage<.001 in. / in.0.0035 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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TASK™ 14

TASK™ 14 is a fast setting two-component urethane that cures quickly to black semi-rigid plastic. TASK™ 14 offers a longer pot life (10 minutes) and demold time of 45 minutes.

With a Shore value of 50D, these semi-rigid plastics are used for a variety of industrial applications including fast mold making, fast model duplication, prototyping, durable miniatures, black props and special effects, or making parts that are impact resistant. Fully cured castings are tough, durable and chemical resistant.

For Best Results… Do not cast TASK™ 14 into platinum cure (addition cure) silicone molds.

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Smooth-Cast® 300

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 ) 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.

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

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