GPO-3 Sheet & Machined Components

High-Strength, Arc-Resistant Insulation Solutions

Emco Plastics supplies GPO-3 laminate sheets, panels, and precision-machined components for demanding electrical and industrial applications. Known for its excellent arc resistance, flame retardancy, and mechanical strength, GPO-3 is a trusted material for switchgear, bus bar supports, and high-voltage electrical insulation.

With decades of experience in performance plastics distribution and fabrication, Emco Plastics delivers reliable material supply, tight tolerances, and fast turnaround—backed by knowledgeable support.

 

 

What Is GPO-3?

GPO-3 is a glass-reinforced polyester laminate designed specifically for electrical insulation applications. It offers a balanced combination of electrical, thermal, and mechanical properties, making it ideal for environments exposed to heat, flame, and electrical stress.

GPO-3 complies with NEMA LI-1 Grade GPO-3 and is commonly used in power distribution and electrical equipment manufacturing.

GPO-3 at a Glance

• Excellent Arc Resistance
• Flame Retardant & Self-Extinguishing
• High Mechanical Strength
• Easy to Machine & Fabricate
• Electrical-Grade Insulation

Electrical Performance

• Excellent arc resistance
• High dielectric strength
• Low electrical conductivity

Thermal & Flame Resistance

• Flame-retardant (self-extinguishing)
• Performs well in high-heat environments
• Maintains dimensional stability under thermal stress

Mechanical Strength

• High impact and flexural strength
• Durable under vibration and mechanical loading
• Resists cracking and delamination

Machinability

• Easily machined, drilled, milled, and routed
• Suitable for complex profiles and tight tolerances

 

Common GPO-3 Applications

 

Emco Plastics supplies GPO-3 for a wide range of electrical and industrial uses, including:

• Switchgear components
• Bus bar supports and spacers
• Electrical panel insulation
• Transformer barriers
• Arc shields
• Circuit breaker parts
• High-voltage insulation panels

 

Available Forms & Sizes

 

Emco Plastics stocks and supplies GPO-3 in multiple configurations:

• Sheet & Panel (standard and custom cut sizes)
• Thicknesses: Common electrical grades available
• Colors: Red (standard), other colors upon request
• Custom Machined Parts: CNC routing, milling, drilling

Need a custom size or fabricated component? Our team can help.

 

Why Choose Emco Plastics for GPO-3?

✔ Extensive inventory and reliable sourcing
✔ Precision CNC machining and fabrication
✔ Electrical-grade material expertise
✔ Fast quotes and responsive customer service
✔ Support from prototype through production

We don’t just sell material—we help you select the right grade, thickness, and fabrication method for your application.

 

GPO-3 vs Other Electrical Laminates

Property	GPO-3	Phenolic	G10/FR4
Arc Resistance	Excellent	Moderate	Good
Flame Retardancy	Excellent	Good	Excellent
Mechanical Strength	High	Moderate	Very High
Cost Efficiency	High	High	Moderate