Flame Retardant Kraft Pulp Electrical Insulation

Flame Retardant Kraft Pulp Electrical Insulation

Fire Retardant- U.L. File number E-31556(M). UL Flame Class 94 V-0. A secondary electrical insulation for fire resistant applications. Used in microwave ovens, appliances, televisions, copiers, smoke and fire alarms, computer filter frames, and more. Useful where safety and fire retardancy are important.

Windsor Stevens’ FRP is an Underwriter’s Laboratories approved flame retardent board, multi-ply constructed from unbleached Kraft pulp. The UL 94 Flammability Classification is 94V-0.

Windsor Stevens FRP has good mechanical strength, punchability and foldability.

Windsor Stevens FRP is available in sheets, strips, rolls and slit coils in thicknesses from .010” to .062”. Above .062” available only in sheets and strips.


 Fiber Content   100% Unbleached Kraft Wood Pulp
 Moisture Content   7.0% Avg.
 Standard Thickness, ± 7% Inches .010 .015 .020 .025 .031
 Apparent Density, (Air Dry), ± 7% g/cc 1.10 1.10 1.10 1.10 1.10
 Weight, (Air Dry), ± 7% lbs./sq. ft. .057 .086 .114 .148 .177
 Tensile Strength, (Avg.) MD lbs./In. 190 285 390 470 550
CMD lbs./In. 35 60 75 95 110
 Burst Strength, (Avg.) lbs./sq. in. 135 245 310 390 460
 Tear Strength, (Avg.) grams MD 215 380 520 700 800
CMD 360 625 765 850  

Click here to download the FRP Spec Sheet.

Click here to download the FRP SDS Sheet.

“Values shown are typical, are not guaranteed, nor to be used for specifications without approval.”

NOTICE: The above information and data are believed to be accurate and reliable. Windsor Stevens assumes no responsibility for end-use applications and no performance warranty is expressed or implied.