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Ecoflex™ 5

Ecoflex™ 5 vs. SORTA-Clear™ 40 vs. TASK™ 14 vs. TASK™ 18

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 14

Ecoflex™ 5 vs. SORTA-Clear™ 40 vs. TASK™ 14 vs. TASK™ 18Ecoflex™ 5

Semi-Rigid Black Urethane Casting Resin

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SORTA-Clear™ 40

Ecoflex™ 5 vs. SORTA-Clear™ 40 vs. TASK™ 14 vs. TASK™ 18Ecoflex™ 5 versus TASK™ 14

Addition Cure Silicone Rubber Compounds

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TASK™ 18

Ecoflex™ 5 vs. SORTA-Clear™ 40 vs. TASK™ 14 vs. TASK™ 18Ecoflex™ 5 versus TASK™ 14 versus SORTA-Clear™ 40

Aluminum Filled Urethane Resin With Very High Compressive Strength

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps800 cps35,000 cps4,400 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)N/A (gram scale required)N/A (gram scale required)
Pot Life1 minute10 minutes60 minutes20 minutes
Cure Time5 minutes45 minutes16 hours16 hours
Shore D Hardness5088
Shore A Hardness540
Specific Volume25.8 cu. in./lb.24.1 cu. in./lb.25.6 cu. in./lb.17.6 cu. in./lb.
ColorTranslucentBlackWater Clear TranslucentMetal Gray
Tensile Strength350 psi1,800 psi800 psi3,250 psi
Elongation @ Break1,000 %125 %400 %1 %
Disclaimer
Although we do our best to ensure accuracy, Smooth-On offers no warranties, promises, and/or representations of any kind, either expressed or implied, as to the accuracy, completeness, or reliability of the information contained on this Compare Tool, nor suitability of the information contained herein to your particular circumstances. Smooth-On assumes no liability for losses or damages of whatever nature (direct, indirect, consequential or other) associated with your use, or inability to use, the Compare Tool, or from your use (or failure to use) the information contained herein. Other useful tools include product technical bulletins and our extensive FAQ section. You can also contact our technical support team.

All Technical Data

Ecoflex™ 5TASK™ 14SORTA-Clear™ 40TASK™ 18
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps800 cps35,000 cps4,400 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:120B100A:10B26A:100B
Pot Life1 minute10 minutes60 minutes20 minutes
Cure Time5 minutes45 minutes16 hours16 hours
Shore D Hardness5088
Shore A Hardness540
Specific Gravity1.07 g/cc1.15 g/cc1.08 g/cc1.57 g/cc
Specific Volume25.8 cu. in./lb.24.1 cu. in./lb.25.6 cu. in./lb.17.6 cu. in./lb.
ColorTranslucentBlackWater Clear TranslucentMetal Gray
Die B Tear Strength75 pli120 pli
Tensile Strength350 psi1,800 psi800 psi3,250 psi
Tensile Modulus514,000 psi
Elongation @ Break1,000 %125 %400 %1 %
100% Modulus15 psi90 psi
Compressive Strength8,420 psi
Compressive Modulus97,300 psi
Flexural Strength10,700 psi
Flexural Modulus86,000 psi
Shrinkage<.001 in. / in.0.0035 in. / in.<.001 in. / in.0.0006 in. / in.
Heat Deflection Temp149 °F
Useful Temperature (min)-65 °F-65 °F
Useful Temperature (max)450 °F450 °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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SORTA-Clear™ 40

SORTA-Clear™ Series rubbers are premium water clear translucent silicone rubbers (platinum catalyst) which cure at room temperature with negligible shrinkage. This product requires a gram scale for measuring parts A + B. SORTA-Clear™ 40 comes in Shore 40A hardness and features high tensile and tear strength.

SORTA-Clear™ silicones are ideal for making prototype, jewelry or other molds of any configuration where model visibility is important (i.e. extracting a model from the mold via cutting). Materials such as urethane, epoxy or polyester resins can then be cast into SORTA-Clear™ silicone without application of a release agent. Other materials such as wax and low melt metal alloys can also be cast into SORTA-Clear™. SORTA-Clear™ can be pigmented with SILC Pig™ silicone pigments.

SORTA Clear™ 40 silicone rubber is FOOD SAFE and can be used for culinary applications including casting chocolate and other confections.

Click here for more SORTA-Clear™ silicone products.

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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 or thermoforming 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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