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Product Details

Entropy Compression Molding Slow Hardener (CPS) is a slow hardener for use with Entropy Compression Molding Epoxy Resin (CPM). The CPM system provides excellent fiber wet out and limits sag in high-temperature cure applications, making it ideal for compression molding processes used to create composite parts. CPM has excellent elongation properties and high modulus, resulting in strong, lightweight composites.

CPS (Slow) Hardener cures in 40 minutes @ 180°F. CPM resin and CPS/CPF hardeners have a bio-content greater than 30% & can be modified with epoxy compatible colorants & fillers. For a faster cure rate, use Compression Molding Fast Hardener (CPF). CPS hardener requires the corresponding size of Compression Molding Epoxy Resin (CPM) for use (2:1 mix ratio). See chart below.

Tech Specs
Specifications & Mechanical Data CPM/CPS Hardener Admixed
Color Amber
Mix Ratio by Volume 2:1 (resin:hardener)
Mix Ratio by Weight 100:40 (resin:hardener)
Pot Life @ 77°F 50 minutes
Tack-Free Time @ 77°F N/A
Recommended Full Cure 40 minutes @ 180°F
VOC Content N/A
Biobased Carbon Content 31%
Tensile Strength 8,990 psi
Elongation 6%
Flexural Strength 13,450 psi
Compression Strength 11,410 psi
Tg Ultimate 154°F
Hardness, Shore D70-80
CPM Epoxy Resin Quantity CPS Hardener Quantity Mixed Quantity
1 qt. resin16 oz.48 oz.
1/2 gallon resin1 qt. hardener3 qt.
1 gallon resin1/2 gallon hardener1.5 gallons
5 gallons2.5 gallons7.5 gallons
Info & Guides

Technical Information

Compression Molding Epoxy Resin (CPM)/Compression Molding Slow Hardener (CPS) System Features

  • For the compression molding process, CPS extends the heat-activated cure time to double that of CPF (fast) hardener.
  • Designed for compression molding of composite parts.
  • Viscosity limits sagging in high-temperature cure applications.
  • Premium fiber wetting qualities.
  • Excellent elongation properties.
  • Lowered sensitizing components for increased user safety.

CPM/CPS Resin System Best Uses

  • Wood laminates
  • Press molding composites
  • Skis and snowboards
  • Skateboards

Safety and Handling Information

Despite the natural derivation of Entropy resin products, exposure to these materials represents hazards typical of all epoxy resins. Exposure should be minimized and avoided through the use of proper personal protective clothing & equipment, and appropriate manufacturing controls. All persons who use, store, or transport these materials should understand proper handling precautions and recommendations, as stated in the SDS (safety data sheets).

WARNING: This product can expose you to chemicals, including propylene oxide, which is known to the State of California to cause cancer. For more information go to