PRO-SET LAM-237 Hardener - Extra Slow

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Special Order Item

This item is not part of our regular stock but is still available as a special order. May be subject to minimums, extended lead-times and a limited return policy.
$141.70 to $387.22



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


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
12 to 14 Hours
Room Temperature
Technical Properties Mixed with 125 Resin
Viscosity, Mixed:
508 cP
Density, Cured:
9.67 lb/gal @ 72°F
86 Type D
Compression Yield:
15,900 psi
Tensile Strength:
9,360 psi
Tensile Modulus:
5.34E+05 psi
Tensile Elongation:
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
84 Type D
Compression Yield:
15,400 psi
Tensile Strength:
8,960 psi
Tensile Modulus:
5.54E+05 psi
Tensile Elongation:
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.



Tips on how to use this product in certain applications are coming soon.

If you would like to learn more about this product, give us a call at (800) 811-2009.


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 availble it will ship within the standard 2-3 day processing time.



Products sold as a clearance may be excess inventory that does not meet the stringent specifications of medical or aerospace applications, have blemishes and/or other imperfections as noted in the product descriptions. These items are sold "As Is", are nonrefundable and will not be backordered. If an ordered quantity cannot be fulfilled, we will ship available on hand quantities and automatically cancel any remaining balance.

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