GPO-3, also widely recognized as UPGM203, is a high-performance, plate-shaped insulation material. It is engineered from alkali-free glass fiber mat soaked in unsaturated polyester resin (UPR) and processed under high heat and pressure.
Whether you are designing switch cabinets or motor components, understanding these six key points will help you optimize your equipment's performance.
1. High-Quality Composition
GPO3 is a composite powerhouse consisting of three main elements:
- Matrix Resin: Unsaturated polyester resin (UPR), known for chemical and heat resistance.
- Reinforcement: Alkali-free glass fiber (E-glass) for high mechanical strength and dimensional stability.
- Additives: Includes flame retardants (like aluminum hydroxide), fillers, and curing agents to provide arc resistance and flame retardancy.
2. Superior Mechanical & Thermal Properties
Compared to ordinary electrical boards, GPO3 sheets offer impressive durability:
- Bending Strength: Reaches up to 340 MPa.
- Heat Tolerance: Suitable for long-term operation at 130–155°C, with short-term resistance reaching 180°C.
3. Exceptional Electrical Insulation
As a premium high arc resistance material, GPO3 provides:
- Arc Resistance: A high performance of 180 seconds to prevent equipment breakdown.
- Dielectric Strength: Boasts 20 kV/mm, ideal for high-voltage applications.
- Volume Resistivity: A large resistance of 10¹³ Ω·cm.
4. Safety and Environmental Standards
Safety is paramount in electrical design. GPO3 meets the UL94V-0 flammability standard. It is non-flammable, halogen-free, and environmentally friendly, with extremely low water absorption of less than 0.1%.
5. Machining and Processing Tips
GPO3 can be tailored into various shapes, including sheets, bars, or tubes. For the best results during secondary processing like drilling or milling:
- Tungsten alloy is the most common material for processing blades.
- The "corn cutter head" is regarded as the best choice for precision.
6. Applications and Cost-Performance
While GPO3 is a thermosetting material that cannot be melted or recycled , its cost-performance is excellent given its properties.
Common applications include:
- High-voltage equipment: Switch cabinets and transformer separators.
- Motors: Slot wedges and high-frequency components.
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Structural supports: Insulators and wear-resistant parts in humid or corrosive environments.
Need Custom GPO3 Parts for Your Project?
At RDS Composite, we don't just provide high-quality GPO3 sheets; we offer precision CNC machining services tailored to your specific drawings. Whether you need arc-resistant supports or high-voltage separators, our experts are here to help.
Request a Free Quote Today Contact our technical team for a Material Consultation.