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Ecoflex™ 5

Mold Max™ XLS™ II vs. Ecoflex™ 5 vs. EpoxAcast™ 655 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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Mold Max™ XLS™ II

Mold Max™ XLS™ II vs. Ecoflex™ 5 vs. EpoxAcast™ 655 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 655 + 102 Hardener

eXtra Low-Shrinkage Silicone Mold Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Silicone Rubber - Tin Cure
Mixed Viscosity13,000 cps23,000 cps30,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)N/A (gram scale required)
Pot Life1 minute75 minutes40 minutes
Cure Time5 minutes9 hours24 hours
Shore D Hardness90
Shore A Hardness530
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.22.7 cu. in./lb.
ColorTranslucentGreyBlue
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™ 5EpoxAcast™ 655 + 102 HardenerMold Max™ XLS™ II
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Silicone Rubber - Tin Cure
Mixed Viscosity13,000 cps23,000 cps30,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:11B100A:10B
Pot Life1 minute75 minutes40 minutes
Cure Time5 minutes9 hours24 hours
Shore D Hardness90
Shore A Hardness530
Specific Gravity1.07 g/cc1.66 g/cc1.22 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.22.7 cu. in./lb.
ColorTranslucentGreyBlue
Die B Tear Strength75 pli110 pli
Tensile Strength350 psi550 psi
Tensile Modulus2,040,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %375 %
100% Modulus15 psi95 psi
Compressive Strength12,500 psi
Compressive Modulus125,500 psi
Flexural Strength7,660 psi
Flexural Modulus1,403,000 psi
Shrinkage<.001 in. / in.0.0006 in. / in.0.001 in. / in.
Heat Deflection Temp135 °F
Useful Temperature (min)-65 °F-65 °F
Useful Temperature (max)450 °F400 °F
Dissipation Factor, 100Hz0.002
Volume Resistivity9.000000E+15 ohm/cm
Dielectric Constant, 100Hz3.4
Dielectric Strength>360 volts/mil
Thermal Conductivity0.24 W/M*K

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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EpoxAcast™ 655 + 102 Hardener

EpoxAcast655 (formerly Metalset™ A-30) is a versatile aluminum filled castable epoxy that is very hard and strong. It is dimensionally stable, even when mass cast up to 512 in3 / 8,390 cm3.

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Mold Max™ XLS™ II

Mold Max™ XLS™ II is a Shore 30A tin-catalyzed silicone mold rubber that exhibits very low long-term shrinkage. XLS™ II molds last longer than other silicones in production when casting chemically harsh resins such as epoxies and polyesters as well as urethane foams.

Mix ratio is 100A:10B by weight. Pot life is 40 minutes and cure time is 24 hours at room temperature. Mold Max™ XLS™ II silicone will reproduce the finest detail and is suitable for a variety of industrial and art related applications including making production molds for, reproducing prototypes, furniture, sculpture and architectural elements. Mold Max™ XLS™ II can be thickened with THI‑VEX™ additive for brush-on applications.

Vacuum degassing mixed material using a vacuum pump and chamber to remove entrapped air is recommended.

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