GPO3 material properties and applications

What is GPO-3 Material? GPO-3 (Glass Mat Reinforced Polyester) is a glass fiber reinforced thermoset composite lamin...

What is GPO-3 Material?

GPO-3 (Glass Mat Reinforced Polyester) is a glass fiber reinforced thermoset composite laminate made from unsaturated polyester resin and glass mat through hot compression molding.
It combines excellent electrical insulation, mechanical strength, heat resistance, and flame retardancy, making it one of the most widely used materials in electrical and power equipment insulation structures.

Key Properties of GPO-3

Property Category	Typical Value / Performance	Description
Electrical Strength	High insulation resistance; Arc resistance > 180 sec	Suitable for high-voltage insulation parts
Mechanical Strength	Flexural strength ≥ 120 MPa	Ensures stable support and load-bearing capacity
Thermal Resistance	Class F (155 °C)	Stable performance at elevated temperatures
Flame Retardancy	UL94 V-0 rated	Excellent fire safety performance
Creep Resistance	Good tracking resistance (CTI > 600V)	Prevents surface electrical leakage
Dimensional Stability	Low thermal expansion coefficient	Maintains shape accuracy under load
Machinability	Can be sawed, drilled, milled, and punched	Suitable for precision mechanical processing
Chemical Resistance	Resistant to oils, acids, and alkalis	Suitable for harsh industrial environments

Typical Applications of GPO-3

1.Electrical and Power Equipment

Transformer insulation barriers, coil supports, end rings, and pressure plates

Motor slot wedges, end caps, and phase insulation components

Insulating supports in reactors, rectifiers, and distribution transformers

2.Switchgear and Distribution Systems

Insulating panels and partitions in low- and high-voltage switchgear

Busbar supports, mounting plates, and structural components

Used in circuit breakers, contactors, and control cabinets

3.Industrial and Transportation Systems

Insulating structural parts in railway traction systems

Wind power converters and control system insulation components

Insulating panels and brackets in industrial automation equipment

Comparison with Similar Materials

Material	Base Resin	Reinforcement	Main Features	Typical Use
G10 / FR4	Epoxy	Woven glass cloth	High mechanical and dielectric strength	PCBs, structural insulation parts
GPO-3	Unsaturated polyester	Glass mat	Excellent arc resistance, flame retardant, cost-effective	Switchgear, transformer parts
UPGM203	Polyester	Woven glass fabric	Higher density and strength, better surface finish	High-end electrical equipment

Summary

GPO-3 offers a perfect balance of mechanical strength, electrical insulation, heat resistance, and cost efficiency, making it an ideal choice for a wide range of electrical insulation and mechanical applications.
It is extensively used in transformers, motors, switchgear, power distribution systems, and renewable energy equipment around the world.