GPO-3 Sheet

GPO-3 insulation sheet is a fiberglass-reinforced, thermoset polyester composite material widely used in electrical and mechanical applications. It is also called UPGM203 plate (Unsatured Polyester Glass Mat Plate). UPGM203 is IEC standard and GPO-3 is NEMA grade. GPO-3 offers excellent electrical insulation, flame retardancy, arc resistance, and thermal stability. So also known as “Red Barrier Board” in construction applications. GPO-3 is commonly used in components such as circuit breakers, switchgear, transformers, and electric motors. Its strong mechanical properties and resistance to heat and fire make it ideal for demanding environments where safety and reliability are essential.

Dimensions: 2000*1000mm; 2000*1250mm; 2500*1250mm; 2500*1300mm or custom cut-to-length sizes
Thickness: 0.5-70mm
Color: Red/White/Yellow/Green or any custom color

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FEATURES

Excellent Electrical Insulation

GPO-3 provides high dielectric strength and tracking resistance, making it ideal for use in high-voltage electrical equipment.

Flame Retardant and Arc Resistant

It meets UL 94 V-0 standards and offers strong resistance to electrical arcing and flame propagation, enhancing safety in electrical systems.

Good Mechanical Strength and Dimensional Stability

GPO-3 maintains structural integrity under mechanical stress and high temperatures, ensuring reliable performance over time.

Thermal Resistance

It can withstand continuous operating temperatures typically up to 155°C, making it suitable for environments with high heat exposure.

Technical Data

Application Area

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GPO-3 sheet is a fiberglass-reinforced thermoset polyester material known for its excellent electrical insulation, mechanical strength, flame retardancy, and heat resistance. It is widely used in electrical and mechanical applications where safety, reliability, and durability are critical.

In the circuit breaker industry, GPO-3 is commonly used for manufacturing safety baffles, protective shields, spacer pads, and phase separation plates, meeting requirements for electrical insulation, heat resistance, mechanical support, and flame retardancy.

For electric motors, GPO-3 serves in the production of armature components, movable covers, stator slot wedges, insulating spacers, thin washers, and carbon brush holders, offering strong insulating and thermal properties essential for motor reliability and performance.

In switchgear, GPO-3 sheets are applied in various types of partitions and liners, arc extinguishing covers, arc chambers, arc plates, arc barriers, terminal boards, phase-to-phase insulators, bottom isolation plates, and contact support structures, providing comprehensive insulation and arc-resistance solutions.

Additionally, GPO-3 is ideal for structural support components in switches and transformers, including busbar clamps and mechanical brackets, where robust support and electrical safety are required.

Thanks to its versatile properties, GPO-3 is a preferred material across the electrical industry for applications demanding high performance in insulation, thermal stability, and flame resistance.