Developed by The Gund Company, PolyPro FR® is a UL Listed flame retardant Polypropylene extruded for electrical insulation applications in electrical and electronic power systems equipment
End User applications
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- Solar Inverters and Combiner Boxes
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- UPS / Data Centers
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- AC Management and Climate controls
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- Low and Medium Voltage Switchgear and Power Distribution equipment
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- DC Power / Rectifiers / Telecom
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- White goods and appliances
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- Medical Applications
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- Power Electronics and Power Supplies
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- Consumer Electronics
- Battery Chargers and Battery Packs




Made in the USA
- Sold directly from The Gund Company and manufactured in the US, readily available in 7 locations in 4 countries.
- 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
- 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
- Additional thickness and colors available upon request.
- All thicknesses available 48“ wide, allow scrap reduction.
- Made and stocked in the U.S.
How can you process/convert PolyPro FR®?
- Die Cutting – Steel Rule Die, Rotary Dies
- Laser or Water Jet Cutting
- Heat Forming
- Thermoforming
- Machining – CNC Mills and Turrets
- Printing
- Welding
- Joinery Methods
- Lamination, Pressure Sensitive Adhesives (PSA), Aluminum and Copper foil
The Gund Company offers all the conversion processes mentioned above in 7 of our facilities across 4 countries
Common Applications for PolyPro FR®
- Phase-to-Phase Barriers
- Fuse Board Insulation
- Switch Insulation
- Terminal Insulation
- Fuse Clip Insulation
- Air Duct Baffles
- Formed Channels
- Ground Insulation
- Chassis / Enclosure Liner
- PCB Insulators / Liners
- Insulating Spacers
- Insulating Shields
- Bus Bar Insulation
- Capacitor Insulation
PolyPro FR® from The Gund Company is a UL equivalent to ITW Formex GK®. PolyPro FR® offers a significant cost advantage as well as numerous other advantages over common flexible materials in the industry.
PolyPro FR® | Formex GK® | Vulicanized Fiber Fibre |
Voltoid D-100 FR | Mylar PET FILM | Nomex® Aramid Paper |
Valox® FR1 |
Lexan® FR 700 Polycarbonate | |
---|---|---|---|---|---|---|---|---|
Flammability | UL 94 V-0 | UL 94 V-0 | UL 94 HB | UL 94 V-0 | UL 94 HB | UL 94 V-0 | UL 94 VTM-2 | UL 94 V-0 |
Dielectric Strength | 1,240 VPM | 987 VPM | 215 VPM | 176 VPM | 1,400 VPM | 845 VPM | 1,090 VPM | 1,500 VPM |
Tensile Strength | 4,495 psi | 4,000 psi | 8,000 psi | 9,500 psi | 25,600 psi | N/A | 6,000 psi | 12,118 psi |
Temperature Index | 110°C | 115°C | 110°C | 90°C | 130°C | 220°C | 125°C | 130°C |
Water Absorption | 0.01% | 0.06% | 82% | 40% | 0.01% | 20% | .05% | .28% |
Relative Cost | 100% | 129% | 106% | 123% | 127% | 687% | 276% | 236% |