PolyPro FR®

Developed by The Gund Company, PolyPro FR® is a flame retardant Polypropylene extruded for electrical insulation applications in electrical and electronic power systems equipment. PolyPro FR® offers the following characteristics:

  • PolyPro FR® from The Gund Company is a UL certified product: E228440
  • UL 94 V-0 rated in full thickness range of 0.010” – 0.125”
  • Extremely low water absorption
  • Suitable for outdoor use with respect to exposure to Ultraviolet Light, Water Exposure, and Immersion in accordance with UL 746C
  • Excellent fabrication and formability characteristics
  • Available in Black or White as a roll, sheet or fabricated part
  • Offers temperature resistance to 110 °C per UL testing
  • Provides a lower cost alternative for designs incorporating the use of materials such as Formex®, Nomex® 410, Valox, Mylar Polyester Film, Vulcanized Fibre, Voltoid, and Quin-T products
  • Excellent Dielectric Breakdown strength

PolyPro FR ® can be customer fabricated for a wide range of application designs. It’s ability to be scored and formed allows it to be made into insulating boxes for various applications in electrical and electronic equipment.

Common Applications for PolyPro FR®

Phase-to-Phase Barriers Fuse Board Insulation Air Duct Baffles
Fuse Clip Insulation Ground Insulation Chassis / Enclosure Liner
Insulating Spacers Formed Channels Capacitor Insulation
Insulating Shields Switch Insulation Formed Angles
Terminal Insulation PC Board Insulators Bus Bar Insulation



Additional Applications for PolyPro FR®

Uninterrupted Power Supplies AC / DC Power Supplies Power Filters & Conditioners
Power Distribution Units Battery Chargers Switching & Fusing Equipment
Meter Cabinet Switchgear Static Transfer Switches Rectifiers & Inverters
Motor Control Centers
* PolyPro FR® is adaptable to a wide range of applications. Contact one of our material specialists today to review your application requirements.

PolyPro FRFormexVulicanized
Duroid D-100 FRMylarNomexValox
FlammabilityUL 94 V-0 UL 94 V-0 UL 94 HB UL 94 V-0 UL 94 HB UL 94 V-0 UL 94 V-0
Dielectric Strength1,000 VPM 00 VPM 215 VPM 200 VPM 1,400 VPM 700 VPM 400 VPM
Tensile Strength4,300 psi 4,800 psi 14,000 psi 12,000 psi 25,600 psi NA 7,500 psi
Temperature Index110 oC 110 oC 110 oC 90oC 130 oC 220 oC 140 oC
Water Absorption0.01% 0.01% 66% 40% 0.01% 20% .04%
Relative Cost$2.15 $2.50 $2.20 $2.20 $2.30 $10.00 $3.50

PolyPro FR® from The Gund Company is a UL equivalent to Formex®. PolyPro FR® offers a significant cost advantage as well as numerous other advantages over common flexible materials in the industry.