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PRO-SET LAM-237 Hardener – Extra Slow



The LAM-237 Extra Slow Cure Laminating Hardener is great to have when you are not sure how long a project may take. This product has a work time of 7 to 8 hours and will fully gel in about 12 to 14 hours at 77°F. | .33 Gallons

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PRO-SET 237 Hardener is mixed with PRO-SET Resins to provide long pot life and cure time. PRO-SET 237 Hardener has an extra slow cure speed which provides 7 to 8 hours working time at 77°F. A typical laminate will be gelled in approximately 12 to 14 hours at 77°F.

  • Not sold as a kit. Must order Resin in addition to one of the hardeners.
  • Domestic Shipping via Ground Only

⚠️WARNING: This product can expose you to chemicals including Propylene oxide which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov



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Physical Properties Mixed with 125/135 Resin

  • Mix Ratio:
    • Volume: 3.5 parts resin to 1 part hardener
    • Weight: 3 parts resin to 1 part hardener
  • 150g Pot Life (125 Resin): 246 minutes @ 72°F
  • 150g Pot Life (135 Resin): 197 minutes @ 72°F
  • Working Time: 7 to 8 Hours @ 77°F
  • Gelled: 12 to 14 Hours
  • Cure: Room Temperature
  • Color: Clear

  Technical Properties Mixed with 125 Resin

  • Viscosity, Mixed: 508 cP
  • Density, Cured: 9.67 lb/gal @ 72°F
  • Hardness: 86 Type D
  • Compression Yield: 15,900 psi
  • Tensile Strength: 9,360 psi
  • Tensile Modulus: 5.34E+05 psi
  • Tensile Elongation: 2.2%
  • Flexural Strength: 14,000 psi
  • Flexural Modulus: 5.34E+05 psi

  Technical Properties Mixed with 135 Resin

  • Viscosity, Mixed: 1095 cP
  • Density, Cured: 9.7 lb/gal @ 72°F
  • Hardness: 84 Type D
  • Compression Yield: 15,400 psi
  • Tensile Strength: 8,960 psi
  • Tensile Modulus: 5.54E+05 psi
  • Tensile Elongation: 1.9%
  • Flexural Strength: 13,900 psi
  • Flexural Modulus: 5.47E+05 psi

Please note: All data to be used as a guide only; not a specification. Tests are performed at @ 72°F x 4 weeks. 


How to Guides Preventing Bubbles in Epoxy Resin


Due to U.S. Department of Transportation Hazardous Materials regulations and International Air Transport regulations we can only ship this product by domestic ground service within the contiguous United States. Limited Quantities are stocked to ensure maximum shelf life of material, please allow a 2-3 week lead time from the date your order is placed. If stock is available it will ship within the standard 2-3 day processing time.


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