Entropy Clear Extra Fast Hardener, CLX
Entropy Resins Entropy Resins
  • Entropy Clear Extra Fast Hardener, CLX

Entropy Clear Extra Fast Hardener

Entropy Clear Extra Fast Hardener (CLX) provides the fastest cure time for the Clear (CLR) and Optically Brightened (BRT) laminating epoxy systems. The CLR system is water-clear; the BRT system is bright white.

Both are low-viscosity, UV-stable liquid epoxies for composites, coatings & adhesive applications, and are optimized for hand lay-up, room temperature processes, or infusion laminating of wood, fibers, glass, carbon, or Kevlar. All Super Sap resins exhibit low color, excellent air release, and great UV & color stability.

Use CLX Hardener with CLR or BRT resins for fastest cure time at room temperature. CLR and BRT resins, as well as CLS/CLF/CLX hardeners have a bio-content greater than 30% & can be modified with epoxy compatible colorants & fillers.

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$41.20 / ea
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Tech Spec Product Info User Generated Content

Features of Clear Extra Fast Hardener (CLX) Combined with Clear (CLR) or Optically Brightened (BRT) Laminating Epoxy Resin

  • Fastest speed hardener for Entropy's high-performance, clear (CLR) epoxy coating, or bright white (BRT) epoxy resin.
  • Green epoxy resin with fast room temperature cure.
  • Excellent composite laminating resin ideal for hand layup and vacuum bagging.
  • Great for high-color applications requiring a clear, non-yellowing resin system.
  • UV-stable formula with relatively low viscosity.
  • First USDA BioPreferred Certified liquid epoxy resin system.
  • CLX requires corresponding size of CLR or BRT Laminating Epoxy Resin for use (2:1 mix ratio). See chart below.

CLR/CLX Resin System Best Uses

  • Surfboards, SUPs (stand up paddleboards), handplanes
  • Adhesives and sealants
  • Fiberglass boat repair
  • Clear coating applications
  • Natural fiber composites
  • Carbon fiber composites
  • Fiberglass composites

BRT/CLX Resin System Best Uses

  • White surfboards
  • Bright white cosmetic marine laminating applications


NOTE: Exact fill weight of 5 Gallon CLX Hardener is 5.212 gallons.

Specifications & Mechanical Data  CLR/CLX Admixed  BRT/CLX Admixed 
Color  Clear  White 
Mix Ratio by Volume  2:1 (resin:hardener)  2:1 (resin:hardener) 
Mix Ratio by Weight  100:47 (resin:hardener)  100:47 (resin:hardener) 
Mixed Viscosity @ 77°F  580 cPs  580 cPs 
Pot Life @ 77°F  18 minutes  18 minutes 
Tack Free Time @ 77°F  2 hours  2 hours 
Ideal Working Temperature Range  Optimal - 70-85°F; Extended - 60-95°F  Optimal - 70-85°F; Extended - 60-95°F 
Ideal Working Humidity Range  Optimal - 0-50%; Extended - 0-95%  Optimal - 0-50%; Extended - 0-95% 
Recommended Full Cure  7 days @ 77°F  7 days @ 77°F 
Tensile Strength  9,500 psi  9,500 psi 
Elongation  6%  6% 
Flexural Strength  14,000 psi  14,000 psi 
Compression Strength  11,330 psi  11,330 psi 
Tg Ultimate  170°F  170°F 
Hardness, Shore D  70-80  70-80 
CLR or BRT Laminating Epoxy Resin Quantity  Extra Fast Hardener (CLX) Quantity  Mixed Quantity 
32 oz.  16 oz. hardener  48 oz. 
1/2 gallon resin  1 qt. hardener  3 qt. 
1 gallon resin  1/2 gallon hardener  1.5 gallons 
2 gallons resin  1 gallon hardener  3 gallons 
5 gallons resin  2.5 gallons hardener  7.5 gallons 
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).

BRAND: Entropy Resins
Rate Of Cure: Extra Fast
Type: Hardener
Usage: Laminating
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