As per our Shipping and Returns Policy, custom cuts and fabricated parts are non-returnable. If you need an over- or undersized item, note it under "Comments" during Checkout. Cut-to-size orders have an acceptable cut tolerance of 1/8" (0.125"), so clarify if the adjustment is to be made on the (+) or (-) side of the saw blade.Please review our full return and shipping policy here.
Measure Twice, Cut Once
Since custom cuts and fabricated parts are non-refundable, be very careful while measuring your dimensions. As each cut is nominal, even the slightest miscalculation could be costly.
How to Use a Measuring Tape
Extend your tape measure several inches to find the 1 and 2 inch markers. In between the inch markers you’ll find 16 equally spaced tick marks.
Measure by counting the increments beyond the nearest inch. As the increments decrease, so does the length of the mark. For example, 1/2" has a bigger mark than 1/4" which has a bigger mark than 1/8". The smallest mark follows at 1/16". Please be aware that some measuring tapes may have even smaller increments.
Features of a Measuring Tape: Sliding End Hook
The sliding end hook is designed for two different types of measurements. An outside measurement (where the hook of the tape hangs over an edge), requires the hook to slide out a bit to account for the thickness of the material. When making an inside measurement (where the hook will push up against a surface), the clip slides in, again, accounting for its thickness. The measuring tape self-adjusts to guarantee an accurate measurement (as far as the tape is concerned).
Sanitizing Acrylic and Polycarbonate Sheet [X]
Acrylic and Polycarbonate Sneeze Guards and like products require special care while cleaning and disinfecting. To maintain the optical clarity of sneeze guards and other acrylic or polycarbonate items, use an acrylic or polycarbonate safe cleaner like Novus Plastic Polish #1, Brillianize Plastic Cleaner, or a mild soap solution.
Please reference the following compatible cleaners when DISINFECTING acrylic and polycarbonate items. The use of commonly available commercial alcohol or ammonia-based disinfectants may cause crazing and damage.
Arc- and Track-Resistant NEMA GPO-3 Electrical Insulation Sheet
NEMA GPO-3 glass polyester laminate is a red fiberglass-reinforced thermoset electrical insulation sheet with UL-recognized status under QMFZ2.E101063. It combines strong arc and track resistance with UL 94 V-0 flame performance, low smoke generation, and low flame spread characteristics for electrical and transit applications.
GPO-3 is used for switchgear barriers, mounting panels, power distribution components, high-voltage appliance insulators, and other parts that need a balance of electrical insulation and mechanical strength.
GPO-3 channels are also available - call us at 888-768-5759. For alternate laminate requirements, compare GPO-3 with G-10/FR4 Glass Epoxy or G-7 Glass-Silicone.
Why Choose GPO-3 Sheet?
GPO-3 is used in electrical insulation components where resistance to tracking, arcing, and flame spread is important. Consider this material if your application requires:
Track Resistance:
Helps resist conductive paths from forming across the surface in demanding electrical environments.
Arc Resistance:
Withstands electrical arcing better than many general-purpose insulation materials.
Flame Performance:
Offers flame-retardant performance, with qualifying grades and thicknesses carrying a UL 94 V-0 classification.
Low Smoke & Flame Spread:
Low smoke generation and low flame spread characteristics support electrical equipment and transit-related applications.
Mechanical Support:
Provides the strength and rigidity needed for barriers, mounting panels, insulators, and other fabricated components.
GPO-3 vs. G-10/FR4: Which Do You Need?
Both are glass-reinforced thermoset electrical laminates, but their resin systems and performance priorities differ.
Choose GPO-3 (This Sheet) when arc resistance, tracking resistance, flame performance, and low smoke or flame spread characteristics are key considerations for switchgear, insulation barriers, or transit components.
Consider G-10/FR4 when higher mechanical strength, lower moisture absorption, or greater dimensional stability is a higher design priority.
Fabrication & Machining
GPO-3 can be machined using standard metalworking equipment for barriers, mounting panels, insulators, and other fabricated electrical components. As GPO-3 is a thermoset laminate rather than a melt-processable thermoplastic, finished shapes are generally produced through cutting and machining.
Handling: Cut sheets may have sharp edges. We recommend wearing protective gloves when unpacking and handling this material to ensure safety.
Suitability: We take pride in the quality of our materials as they leave our facility. However, because every project is unique, we cannot account for how materials are modified, stored, or used after delivery. Please perform the necessary tests to ensure this material is right for your specific application and end-use conditions.
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Technical Performance
GPO-3 is a fiberglass-reinforced thermoset polyester laminate designed for electrical insulation applications where arc resistance, tracking resistance, flame performance, and mechanical support must work together.
Resists the formation of conductive tracks across the surface and withstands exposure to electrical arcing.
Electrical Insulation:
Provides dependable dielectric performance for barriers, insulators, and components used around energized equipment.
Mechanical Support:
Offers the strength and rigidity needed to support electrical assemblies while remaining practical to cut and machine.
Key Properties
Flame-Retardant Performance:
Carries a UL 94 V-0 classification for applications where flame behavior is an important consideration.
Elevated-Temperature Strength:
Retains mechanical strength at elevated temperatures, but continuous-use limits should be confirmed for the specific application.
Low Smoke & Flame Spread:
Low smoke generation and low flame spread characteristics support consideration for transit and enclosed electrical equipment.
Moisture Resistance:
Maintains electrical-insulation performance where moisture or humidity may be present.
Common Industrial Applications
Switchgear: Barriers, phase isolation components, and mounting panels where arc and track resistance are important selection criteria.
Power Distribution: Insulating panels, barriers, and fabricated components used to electrically separate or support energized assemblies.
High-Voltage Equipment: Appliance insulators and related machined components requiring electrical insulation with useful mechanical strength.
Transit Equipment: Insulation components where GPO-3's low smoke generation, low flame spread characteristics, and flame classification align with the application's material requirements.
Engineering Limitations & Alternatives
GPO-3 offers a useful balance of electrical, flame, and mechanical properties, but certain applications or environments may require an alternative material:
Higher Mechanical Loads: GPO-3 has less overall mechanical strength than comparable glass-reinforced epoxy laminates, which can matter in highly loaded structural components. Better Alternative: For higher mechanical strength and electrical insulation in humid environments, consider G-10/FR4 Glass Epoxy.
Higher Thermal Requirements: GPO-3 cannot handle applications with more demanding thermal requirements past its specified limits. Better Alternative: For electrical laminate applications where higher temperature capability is needed and a V-0 fire rating is not required, consider G-11 Glass Epoxy.
NEMA GPO-3 Glass Polyester Laminate - Red Questions?
