Industry-Grade GPO-3 (UPGM-203) Electrical Insulation Materials

Our GPO-3 Insulation Sheet (internationally recognized as UPGM-203) is a heavy-duty rigid laminate composite constructed from high-grade alkali-free glass fiberglass matte impregnated with an unsaturated polyester resin matrix, processed under intense heat and synchronized high pressure.

As a premier OEM/ODM factory , Wuxi Shangjue Technology maintains an extensive inventory of master laminates alongside highly automated processing lines. Whether you require standard bulk sheets or complex finished industrial components processed strictly according to your blueprints or master samples, we provide zero-defect, ready-to-assemble solutions.

⚙️ Section 1: Our B2B Core Advantages & Customization Capabilities

Wholesale Full Master Sheets & Flexible MOQ: We stock standard 1000mm × 2000mm and 1000mm × 1200mm master boards with customizable thickness ranges from 0.3mm up to ultra-thick 50mm. Benefit from flexible ordering terms and rapid factory-direct shipping.
OEM Processing from Drawings or Samples: Eliminate the hassle of cutting tough fiberglass in your own facility. Simply send us your technical blueprints (.DXF, .DWG, .STEP, Gerber files) or ship us a physical sample. Our engineering team handles the programming, duplicating, and manufacturing perfectly.
High Machinability & Automated Fabrication: GPO-3 possesses exceptional mechanical processing capabilities. We utilize high-speed precision equipment to perform lathe turning, stamping, laser trimming, multi-hole drilling, sandblasting, milling, and precision sawing.
Easy Assembly Options: Our finished components feature crisp dimensions, allowing seamless industrial integration via structural adhesives, metallic screws, or riveting methods.

🌟 Section 2: Core Performance Features & Material Benefits

Exceptional Arc Resistance: Boasts an elite arc tracking time of $\ge 180$ seconds, crucial for confining and extinguishing chaotic electrical arcs in heavy power systems.
Elite Tracking Resistance (CTI $\ge 600$ V): Features a Comparative Tracking Index of $\ge 600$ V, guaranteeing superb resistance to surface dielectric breakdown and leakage paths under extreme ambient moisture or contamination.
Superior Thermal Stability & Shock Resistance: Rated for continuous thermal service environments above 155°C (Class F insulation). It operates seamlessly across ultra-wide thermal variations ranging from -273°C up to +155°C without cracking.
Top-Tier Fire Safety (UL94 V-0 Halogen-Free): Our UTR grade is strictly Halogen-Free, releasing minimal smoke and zero toxic halogenated gases during combustion, ensuring personnel safety in enclosed environments.

Excellent Dimensional Flatness: Perfectly smooth surfaces with zero pitting or layer delamination, maintaining precise geometry under intensive structural loads.

📊 Section 3: Technical Specifications Datasheet

SJ Product Number				SJ-GPO-3
IEC893/EN 60893 Grade				UP GM203
DIN 7735 Grade				HM2471
ANSI(NEMA)Grade NEMA L1-1				GPO-3
Items		Test Method	Unit	Typical value
physical properties	color	Visual inspection	—-	Red/White/Brown/Grey
	Specific Gravity	IEC60893-2:2003	g/cm³	1.95-2.05
	Water absorption	ISO62:2008	%	≤0.5
mechanical properties	Ttensile Strength	IEC60893-2:2003	Mpa	≥130
	Compressive Strength	IEC60893-2:2003		≥300
	Flexural Strength	IEC60893-2:2003		≥180
	Impact strength	IEC60893-2:2003	KJ/m²	≥60
electrical properties	Volumetric Resistivity	IEC60093:1980	Ω.m	≥1.0×10¹⁰
	Surface Resistivity	IEC60093:1980	Ω	≥1.0×10¹²
	Electric Strength	IEC60893-2:2003	KV/mm	≥12
	Breakdown Voltage	IEC60893-2:2003	KV/25mm	≥80
	Arc Resistance	IEC61621：1997	sec	≥180
	PTI Proof Tracking lndex PTI	IEC60893-2:2003	—	≥600
	Dielectric constant	IEC60893-2:2003	—	4.0-5.0
	TG Dissipation Factor	IEC60893-2:2003	—	≤0.03
Thermal properties	Coefficient of temperature expansion	ASTME 228-11	1/K	≤2×10^-5
Thermal properties	Temperature index	IEC60085：2004	℃	155
Flame Resistance performanec	oxygen index	ISO 4589-2：1996	%O2	≥30
	Flame Resistance	IEC60893-2:2003	—	V-0
	Toxicant(Emission halogen etc)	E622	—	low
Other properties	The Anti microbial properties of bacteria	G21-G22	—	good

🎯 Section 4: Global B2B Industrial Applications

Our precision-fabricated GPO-3 insulating parts are critical safety components throughout mainstream electrical infrastructure:
1. Air Circuit Breakers (ACB / Frame Break): Safety barriers, arc-chute shutters, phase isolation shields, interphase dividers, and structural spacer pads.
2. Molded Case Circuit Breakers (MCCB): Phase separation barriers, arc-extinguishing chambers, and internal safety liners.
3. Electric Motors & Generators: Armature components, slot wedges, stator insulation, moving cover plates, carbon brush holders, and tight-tolerance shims.
4. Medium & High-Voltage Switchgears: Grid cubicle front/rear/top/bottom enclosures, busbar support brackets, and heavy-duty arc-resistant structural elements.
5. Transit & Renewable Energy: High-stress insulating supports inside subway/railway power distribution boxes, wind power inverters, and solar combiner systems.
📦 Section 5: Heavy-Duty Export Packaging & Logistics

We understand that bulk industrial laminates must be fully shielded during long-distance maritime freight.
- Master Panels & Large Fabrication Orders: Statically stacked on heavy-duty reinforced pallets, wrapped tightly with moisture-barrier vacuum films, and secured using industrial structural strapping.
- Small Precision Machined Components: Packaged inside multi-layered corrugated export cartons, layered with shock-absorbing bubble wraps and foam inserts to prevent surface scratches.
📩 Request a Custom Quote & DFM Review

Are you looking for a reliable, ISO-certified GPO-3 Chinese factory to scale up your production or reduce material sourcing costs?

📩 Contact Wuxi Shangjue Technology today! Send us your thickness requirements, panel volume, or custom CAD blueprints to receive a transparent B2B wholesale quotation within 24 hours.