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Standard: IEC60893-3-5-2009, UPGM203
Regular Size: 1000mm*2000mm/1250mm*2000mm/1250mm*2500mm
Standard Thickness: 1-40mm
Color: Red/White
Temperature resistance:Class F (155℃)
Application:circuit breakers, switchgear, transformers, electric motors, and rail transit systems
GPO-3 (or GPO3) sheet is a rigid laminated insulation material manufactured by impregnating alkali-free glass fiber mat with unsaturated polyester resin, combined with specific additives, and hot-pressed into sheet form.
It features high mechanical strength, excellent electrical insulation properties, flame retardancy (UL94 V-0 rating), and strong resistance to arc and tracking. GPO-3 is widely used in power and electrical applications such as power generation equipment, electric motors, and switchgear systems.
Material Composition: Alkali-free glass fiber mat reinforced with unsaturated polyester resin.
Electrical Insulation: Excellent dielectric properties, suitable for high-voltage applications.
Flame Retardancy: Typically rated UL94 V-0, providing outstanding fire resistance and safety performance.
Mechanical Strength: High mechanical strength with excellent dimensional stability; resistant to cracking and fragmentation, suitable for structural support components.
Thermal Resistance: Capable of maintaining stable mechanical and electrical performance under continuous operating temperatures ranging from 120°C to 210°C.
Machinability: Easy to fabricate; suitable for punching, drilling, CNC machining, and shearing processes.
GPO-3 sheets are widely used in critical components of power systems:
Circuit Breakers: Safety barriers, arc chutes, contact supports, and interphase insulation.
Switchgear: Partition plates, back panels, busbar supports, and terminal boards.
Motors and Transformers: Armature parts, brush holder brackets, and slot wedges.
Rail Transit: Commonly used for insulation protection in rail equipment due to its low-smoke and non-toxic properties.
1.Factory: We operate a professional electrical insulation materials manufacturing facility and are ISO-certified.
2.Fully Automated Production: Our advanced automated workshop is supported by a strict and comprehensive quality management system.
3.Quality Inspection: Equipped with four major laboratories and five core product performance testing capabilities.
4.Processing Services: We provide customized processing solutions based on your requirements, ensuring high quality and on-time delivery.
5.Product Certification: Our products comply with UL, SGS, RoHS, and REACH standards. Sample testing is available upon request.
6.Ready Stock Supply: Standard products can be delivered within 7–15 days.
Our company is certified to ISO 9001, ISO 14001, and ISO 45001 management systems. Our products also comply with international certifications and reports including UL, RoHS, REACH, MSDS, CEMT, as well as factory inspection and test reports provided before shipment.
| No. | Test Items | Unit | Standard Value |
| 1 | Compressive Test | MPa | ≥220 |
| 2 | Deflection Temperature Under Load | ℃ | ≥240 |
| 3 | Density | G/Cm3 | 1.75~1.95 |
| 4 | Flexural Modulus | MPa | ≥10000 |
| 5 | Shear Strength | MPa | ≥100 |
| 6 | Surface Resistance | Ω | ≥ 1.0×10¹² |
| 7 | Tensile Modulus | GPa | ≥11 |
| 8 | Tensile Strength | MPa | ≥95 |
| 9 | Vertical Burning | / | V0 |
| 10 | Water Absorption | / | ≤ 0.5% |
| 11 | Relative Permittivity & Dissipation Factor | Dissipation Factor | ≤0.015 |
| Dissipation Factor | ≤ 4.5 | ||
| 12 | Charpy Notched Impact Strength | KJ/M2 | >41 |
| 13 | Dielectric Breakdown Voltage & Dielectric Strength | KV/Mm(Vertical Direction) | ≥12 |
KV(Parallel Layer Direction) | >50 | ||
| 14 | Flexural Strength | MPa(23℃) | ≥130 |
| MPa(130℃) | ≥90 | ||
| 15 | Glowing-Wire Test(GWEPT) | ℃ | GWEPT≥960 |
| 16 | Poisson’s Ratio(Μb) | / | 0.29-0.39 |
| 17 | Comparative Tracking Index(CTI) | / | CTI≥600V |
| 18 | Arc Resistances | S | ≥180s |
