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Product Details

Entropy Optically Brightened Laminating Epoxy Resin (BRT) is the base component of Entropy's optically brightened epoxy system. Based on Entropy's Clear Epoxy (CLR), BRT resin is formulated specifically for white surfboard builds, hand layups, room-temperature laminating processes, and infusion laminating carbon fiber, fiberglass, Kevlar, or wood. Its bright white finish shows little or no color change after extended sun exposure.

Pair BRT resin with CLS, CLF, or CLX hardeners. Choose CLS slow hardener for extended working time, CLF fast hardener for shorter pot life, faster curing, & low blush in cooler temperatures, and CLX hardener for the fastest tack-free time.

All systems have a bio-content greater than 30% & can be modified with colorants & fillers.

NOTE: Not recommended for dark color substrate applications, use Clear Laminating Resin (CLR) instead.

Tech Specs
Optically Brightened (BRT) Laminating Epoxy Resin & Hardener, Admixed Clear Extra Fast Hardener (CLX) Clear Fast Hardener (CLF) Clear Slow Hardener (CLS)
Color ClearClearClear
Mix Ratio by Volume 2:1 (resin:hardener)2:1 (resin:hardener)2:1 (resin:hardener)
Mix Ratio by Weight 100:47 (resin:hardener)100:47 (resin:hardener)100:47 (resin:hardener)
Pot Life @ 77°F 18 minutes21 minutes43 minutes
Tack-Free Time @ 77°F 2 hours4 hours8 hours
VOC Content 19.5 g/L (0.16 lbs/gal)31.5 g/L (0.26 lbs/gal)16.1 g/L (0.13 lbs/gal)
Biobased Carbon Content 21%21%29%
Tensile Strength 9,500 psi9,500 psi9,800 psi
Elongation 6%5%6%
Flexural Strength 14,000 psi13,500 psi14,580 psi
Compression Strength 11,330 psi11,330 psi12,520 psi
Tg Ultimate 170°F149°F171°F
Hardness, Shore D 70-8070-8070-80
Optically Brightened Laminating Epoxy Resin (BRT) Quantity CLX, CLF, or CLS Hardener Quantity Mixed Quantity
1 qt. resin16 oz. hardener48 oz.
1/2 gallon resin1 qt. hardener3 qt.
1 gallon resin1/2 gallon hardener1.5 gallons
5 gallons resin (exact fill weight is 4.713 gallons)2.5 gallons hardener7.5 gallons
Info & Guides

Why Use Optically Brightened (BRT) Super Sap® Laminating 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 Optically Brightened Laminating 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 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

Entropy Optically Brightened Laminating Epoxy Resin (BRT) Features

  • Bright white color is ideal for ultra-white marine cosmetic laminating applications.
  • Choose from Extra Fast (CLX), Fast (CLF), and Slow (CLS) Hardeners to adjust working properties and cure time
  • UV stable formula
  • Low exotherm
  • Excellent air release
  • Requires corresponding sized CLX (Extra Fast), CLF (Fast) or CLS (Slow) hardener for use (2:1 mix ratio). See chart below.

Best Use for Optically Brightened (BRT) Laminating Epoxy Resin & CLX, CLF, or CLS Hardeners

  • White surfboards

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).