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Product Details

Formerly known as Super Sap ONS, Entropy's High Bio-Based Slow Hardener is the slow cure rate catalyst for their High Bio-Based Laminating Epoxy Resin (ONE) system. As the industry's First USDA Bio-Preferred Certified liquid epoxy resin product, this epoxy system delivers it all: high bio-renewable content, a green resin with room temperature cure, and low sensitizing ingredients for increased user safety.

Its relatively low viscosity and great adhesion to all substrates makes High Bio-Based Epoxy excellent for composite laminating, and it features air release additives that allow for smooth brush-on coatings.

Hardener requires corresponding sized High Bio-Based Laminating Resin (ONE) for use (2:1 mix ratio). See chart below.

Tech Specs
High Bio-Based Resin (ONE)/Slow Hardener (ONS) Admixed Specifications & Mechanical Data
Color Slight amber color
Mix Ratio by Volume 2:1 (resin:hardener)
Mix Ratio by Weight 100:47 (resin:hardener)
Mixed Viscosity @ 77°F 800 cPs
Pot Life @ 77°F 43 minutes
Tack Free Time @ 95°F 8 hours
Ideal Working Temperature Range Optimal - 70-85°F; Extended - 60-95°F
Ideal Working Humidity Range Optimal - 0-60%; Extended - 0-90%
Recommended Full Cure 7 days @ 77°F. Post cure recommended.
Tensile Strength 9,800 psi
Elongation 6%
Flexural Strength 14,580 psi
Compression Strength 12,520 psi
Tg Ultimate (DSC, midpoint) 171°F
Hardness, Shore D 70-80
High Bio-Based Laminating Epoxy Resin (ONS) Quantity High Bio-Based Slow Hardener (ONS) Quantity Mixed Quantity
16 oz resin8 oz. hardener24 oz.
1/2 gallon resin1 qt. hardener3 qt.
1 gallon resin1/2 gallon hardener1.5 gallons
2 gallons resin1 gallon hardener3 gallons
4 gallons resin2 gallons hardener6 gallons
5 gallons resin2.5 gallons hardener7.5 gallons
Info & Guides

NOTE: Exact fill weight of 5 Gallon ONS Hardener is 5.078 gallons.

Technical Information

Entropy High Bio-Based Slow Hardener (ONS)

  • Pairs with Entropy High Bio-Based Laminating Resin to create a green epoxy system with longer pot life
  • Slow Hardener provides lower viscosity and slower cure speed
  • First USDA BioPreferred Certified liquid epoxy resin System
  • System is excellent for laminating composites

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