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Product Details

Entropy Resins Compression Molding Epoxy Resin (CPM) is designed specifically for the compression molding process used on composite parts. It has thixotropic characteristics to minimize sag in high temperature cure applications and premium fiber wetting qualities. CPM has excellent elongation properties and a high modulus to enable durable, lightweight composites.

Available in fast and slow cure speeds, depending on hardener: CPS (Slow) Hardener cures in 40 minutes @ 180°F; CPF (Fast) Hardener cures in 20 minutes @ 180°F. CPM resin requires corresponding size of Compression Molding Slow Hardener (CPS) or Compression Molding Fast Hardener (CPF) for use (2:1 mix ratio). See chart below.

Tech Specs
CPM Resin and Hardener, Admixed Compression Molding Fast Hardener (CPF) Compression Molding Slow Hardener (CPS)
Color AmberAmber
Mix Ratio by Volume 2:1 (resin:hardener)2:1 (resin:hardener)
Mix Ratio by Weight 100:43 (resin:hardener)100:40 (resin:hardener)
Pot Life @ 77°F 20 minutes50 minutes
Tack-Free Time @ 77°F N/AN/A
VOC Content N/AN/A
Biobased Carbon Content 31%31%
Tensile Strength 8,860 psi8,990 psi
Elongation 6%6%
Flexural Strength 13,560 psi13,450 psi
Compression Strength 12,630 psi11,410 psi
Tg Ultimate 154°F154°F
Hardness, Shore D70-8070-80
CPM Epoxy Resin Quantity CPS or CPF 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 gallons (exact fill weight is 4.789 gallons)2.5 gallons7.5 gallons
Info & Guides

Why Choose Compression Molding Super Sap® Epoxy Resin?

Super Sap formulations, as opposed to traditional epoxies that are composed primarily of petroleum-based materials, contain renewable, biobased materials sourced as co-products or from the waste streams of other industrial processes, such as bio-fuels and wood pulp production. The benefits of these natural components are exceptionally high adhesion properties and excellent elongation.

Three Easy Ways to Measure Compression Molding Epoxy Resin and Hardener

  • By Volume: 2 parts resin to 1 part hardener.
  • By Weight: Varies. Check Technical Data Sheets for specific ratio.
  • By Pumps: The calibrated Entropy Pump Set (sold separately) measures the exact 2:1 ratio by volume with no mess or guessing about correct measurements, so you get a proper cure every time. Pumps can be used with the 2:1 High Bio-Based Laminating Epoxy Resin (ONE), Clear Laminating Epoxy Resin (CLR), Optically Brightened Laminating Epoxy Resin (BRT), Compression Molding Epoxy Resin (CPM), and Clear Casting Epoxy Resin (CCR) systems.

Measuring & Mixing Notes: For best results, use a scale to measure the two components by weight (within 5% of the recommended mix ratio). Always mix product thoroughly for at least two minutes. To ensure complete mixing, scrape all surfaces of the container.

Technical Information

Compression Molding Epoxy Resin (CPM) Features

  • Designed for compression molding of composite parts
  • High-viscosity resin system
  • Thixotropic characteristics
  • High modulus
  • Premium fiber wetting qualities
  • Excellent elongation properties
  • Lowered sensitizing components for increased user safety

Best Uses for Compression Molding Epoxy Resin (CPM)

  • 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 epichlorohydrin, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to