Methyl Ethyl Ketone Peroxide (MEKP) Catalysts

These catalysts are specifically designed for use with polyester and vinyl ester resins. Although similar, each type of catalyst gives slightly different working characteristics and ultimate cured properties. Consult the resin manufacturer's technical data sheet for more information.

412161 MEKP 0.75 oz. Liquid Hardener is discontinued and has been replaced with 412162 MEKP 1 oz. Liquid Hardener.

SKU Description   UM Thick Width Length Height Board ft. Net Wt. Diameter Grade Grit Plys Radius SPB Ship Note Min. Qty Pcs/Box Pcs/Bundle Winding Ft/Box Handle Len Head Diam Head Len Mfg. # Qty
412162 MEKP Liquid Hardener - 1 oz. EA HAZ-A
412114 MEKP 9 Liquid Hardener - Gallon EA 8 HAZ-G
412125 MEKP-30 Catalyst - 1 Gallon SO KG 8 HAZ-G
412132 MEKP 925 Hardener - 2 oz. (2 required per 1 Gallon Resin) EA HAZ-A
412134 MEKP 925 Hardener - 1 Gallon (3.63 kg) SO KG 8 HAZ-G 301244
412135 MEKP 925H Hardener - 1 Gallon (3.63 kg) SO KG 8 HAZ-G 205709
300378 Catalyst Bottle (Adjustable Volume) EA

Click Here to View Our Closeout Page

Important Information

  • Shipping: Freeman charges standard published UPS/FedEx shipping rates (unless freight is specified). All orders under $25 are subject to a $5 small order fee. International orders are subject to a $250 minimum order.

  • Liquid products are sold by weight, not volume.

  • SPB = Sheets per Box

  • HAZ-G = Hazardous material, cannot ship air, up to $33 surcharge applied for each package shipped ground within the US.

  • HAZ-A = Hazardous material, cannot ship air, no surcharge for ground shipping.

  • HAZ-T = Toxic material, must be sent by freight carrier.

  • FRT = must be sent by freight carrier due to size, weight, or hazardous classification.

Product Table Legend

  Special Order

Minimum quantities and extended lead times may apply. Cannot be cancelled or returned once processed.


This item is not stocked in Freeman warehouses and may be subject to extended lead times.

  Limited Stock

Due to limited stock availability, extended lead times may apply.

  Closeout Item

Available at special pricing on our closeout list. Subject to prior sale.

  Web Discounts

Item is discounted for quotes or orders completed on the website only.

/  Favorite Items

When logged in, select your favorite items in the table and view later in "My Account".