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Ecoflex™ 5

Ecoflex™ 5 vs. TASK™ 18

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 18

Ecoflex™ 5 vs. TASK™ 18Ecoflex™ 5

Aluminum Filled urethane Casting Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps4,400 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Pot Life1 minute20 minutes
Cure Time5 minutes16 hours
Shore D Hardness88
Shore A Hardness5
Specific Volume25.8 cu. in./lb.17.6 cu. in./lb.
ColorTranslucentMetal Gray
Tensile Strength350 psi3,250 psi
Elongation @ Break1,000 %1 %
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™ 18
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps4,400 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B26A:100B
Pot Life1 minute20 minutes
Cure Time5 minutes16 hours
Shore D Hardness88
Shore A Hardness5
Specific Gravity1.07 g/cc1.57 g/cc
Specific Volume25.8 cu. in./lb.17.6 cu. in./lb.
ColorTranslucentMetal Gray
Die B Tear Strength75 pli
Tensile Strength350 psi3,250 psi
Tensile Modulus514,000 psi
Elongation @ Break1,000 %1 %
100% Modulus15 psi
Compressive Strength8,420 psi
Compressive Modulus97,300 psi
Flexural Strength10,700 psi
Flexural Modulus86,000 psi
Shrinkage<.001 in. / in.0.0006 in. / in.
Heat Deflection Temp149 °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™ 18

TASK™ 18 is a relatively low viscosity aluminum filled urethane casting resin that was developed specifically for making short run vacuum forming molds. When Parts A and B are mixed in proper proportion, TASK™ 18 cures overnight at room temperature with negligible shrinkage to a very hard plastic that has a very high compressive and flexural strength. Cured TASK™ 18 can be polished, machined, drilled, painted, etc. TASK™ 18 is also used to make industrial production parts, prototype parts and tracing patterns.

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