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GPO-3 Grade Sheet

GPO-3 NEMA grade sheet is a highly flame resistant material made from a blend of fiberglass reinforced thermoset polyester. This UL®-recognized material is the industry standard for electrical insulation applications thanks to its highly flame retardant characteristics and arc/track resistance.
GPO-3 sheet exhibits an excellent combination of high strength, flame resistance, and low smoke generation. It is typically fabricated into interphase and end barriers and switchgears; GPO-3 is also popular for transit and marine applications where safe, yet economical materials are needed. In fact, thyssenkrupp Engineered Plastics supplies a “transit grade” GPO material that was designed specifically for the New York City transit system. It is now used in many other cities, as well, for third rail covers and other applications.
Online Plastics® offers 0.125” (1/8”) and 0.250” (1/4”) thick GPO-3 grade sheet in standard and custom sizes to meet the needs of your specific application. Cut-to-size GPO-3 grade sheet is available in sizes up to 60” x 96”. Use the form below to specify the custom cut-to-size GPO-3 sheet you need and to receive a free price quote.
Make OnlinePlastics your first choice for Mar-Bal standoff insulators made from GPO-3 grade sheet and other high quality electrical insulation products and materials. Contact us today to place an order or for more information.
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Standard & Cut to Size Products

*Please select the quantity for each item you wish to order and click the 'Add To Quote' button below.

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Additional Information
Properties of GPO-3 Grade Sheet
  • 1,000 minutes track resistance
  • High dielectric strength (electrically insulating)
  • Highly flame resistant
  • High strength (8,000 psi tensile strength)
  • Low smoke & smoke toxicity
  • UL® recognized
  • NEMA grade
GPO-3 Grade Sheet Specifications
  • Colors: white, black, red
  • Thickness: 0.125” (1/8”) and 0.250” (1/4”)
  • Max. Length: 96”
  • Max. Width: 60”
Typical Applications for GPO-3 NEMA Grade Sheet
  • High voltage insulators
  • Bus bar supports
  • Barriers
  • Switchgear mounting panels
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