GPO-3 sheet material detailed analysis and purchase guide

Product Introduction GPO-3 is a rigid sheet insulation material manufactured by impregnating alkali-free glass fiber...

Product Introduction

GPO-3 is a rigid sheet insulation material manufactured by impregnating alkali-free glass fiber mats with unsaturated polyester resin and forming them through a hot-pressing process. Its core components include glass fiber, polyester resin, and additives, offering exceptional electrical properties, mechanical strength, and flame resistance. Compliant with international standards (e.g., IEC 60893, NEMA L1-1), it is widely used in electrical, mechanical, and automotive industries.

Key Features

Superior Electrical Performance
Arc resistance ≥180 seconds, Comparative Tracking Index (CTI) ≥600V, parallel layer breakdown voltage ≥40 KV/mm.
High insulation: Volume resistivity ≥1.0×10¹² Ω·m, Surface resistivity ≥1.0×10¹² Ω.
Stable Mechanical Properties
Flexural strength ≥180 MPa (room temperature), retaining ≥90 MPa under high temperatures; impact strength ≥60 KJ/m², suitable for complex structural machining.
Easy processing: Can be molded via stamping, drilling, or shearing, with a minimum bend diameter of 19mm.
Thermal and Flame Resistance
Thermal class F (155℃), UL 94 V-0 flame retardancy, oxygen index ≥30%, low smoke and halogen-free combustion, meeting environmental requirements.
Wide operating temperature range (-273℃ to +155℃), heat deflection temperature ≥250℃.
Environmental Adaptability
Water absorption ≤0.5%, excellent dimensional stability for humid environments.
Strong microbial resistance, minimal degradation during long-term storage.

Application Scenarios

Electrical Equipment
Circuit breakers: Safety barriers, arc chute partitions, phase barriers (for molded-case or air circuit breakers).
Switchgear: Partition systems (front/rear/phase isolation), busbar clamps, contact supports.
Motor and Automotive Industries
Motor armature components, brush holders, stator slot wedges; insulation parts for automotive high-voltage electrical systems.
Other Fields
Transformer insulation plates, explosion-proof equipment housings, arc-resistant structural components.

Technical Parameters

Parameter	Unit	Typical Value	Test Standard
Density	g/cm³	1.85-2.10	IEC 60893-2:2003
Flexural Strength (RT)	MPa	≥180	IEC 60893-2:2003
Arc Resistance	s	≥180	IEC 61621:1997
Comparative Tracking Index (CTI)	V	≥600	IEC 60893-2:2003
Parallel Breakdown Voltage	KV/mm	≥40	IEC 60893-2:2003
Dielectric Constant (1MHz)	—	4.5-5.0	IEC 60893-2:2003
Water Absorption	%	≤0.5	ISO 62:2008
Flame Retardancy Rating	—	UL 94 V-0	IEC 60893-2:2003
Temperature Index	℃	155	IEC 60085:2004

Purchasing Guidelines

Certifications

Verify UL certification (request UL file number) and compliance with RoHS/Reach standards.

Technical Validation

Confirm density (1.81-1.83 g/cm³ for high-quality products), CTI (≥600V), and arc resistance.

Require third-party test reports for critical parameters (e.g., flexural strength, dielectric constant).

Appearance and Combustion Tests

Authentic GPO-3 produces minimal smoke, no delamination during combustion; inferior products may emit pungent fumes.

Check color (red/white/brown-red) and surface smoothness; avoid products with impurities or bubbles.

Application-Specific Selection

Choose thickness (0.5-80mm) and dimensions (e.g., 1000×2000mm) based on needs; verify machining precision for custom profiles (U/T-shaped).

Supplier Evaluation

Prioritize suppliers offering full-service insulation solutions (e.g., Changzhou Weiyuan, Yangzhou Tuoteng) to ensure supply stability and technical support.