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Epoxy Fiberglass Laminated Tube （EPGC21/EPGC22 ）
Standard: IEC61212-2006, GB/T5132-2009
Regular Size: 1000mm
Wall thickness: 1.5-200mm(support customize)
Diameter:Ф9mm-Ф1030mm(support customize)
Thermal rating: Class B(130℃)/Class F(155℃)
Color:Green/Yellow
Application:oil transformers,switchgear,Electric motors, Wear-resistant bushings
Epoxy Fiberglass Laminated Tubes (such as FR4, G10, and G11) are rigid tubular insulating materials manufactured by impregnating alkali-free fiberglass cloth with epoxy resin, followed by drying, rolling, and hot-press curing processes. They feature exceptionally high mechanical strength, superior electrical insulation, excellent chemical resistance, and good machinability. These tubes are widely used as insulating structural components in electrical equipment, such as high-voltage switchgears and transformers.
High Strength & Durability: Features exceptional mechanical strength (tensile, axial compression, and flexural), capable of withstanding dynamic pressure and vibrations while maintaining structural stability.
Superior Electrical Insulation: Maintains high dielectric strength and electrical breakdown resistance even in humid conditions, making them ideal for high-voltage environments.
Thermal & Chemical Resistance: Typically rated for Class B or higher thermal resistance, with excellent resistance to acids, alkalis, salts, and various chemical solvents.
Most industrial grades follow the NEMA standards:
G10 / FR4: The most versatile grades; FR4 is flame-retardant (UL94 V-0) and offers high mechanical strength.
G11 / FR5: Offers superior high-temperature performance and higher strength retention compared to G10.
3640 / 3240: Standard domestic/industrial grades commonly used for insulation components in motors and transformers.
Epoxy fiberglass laminated tubes are widely used as insulating structural components in transformers, high-voltage switchgear, and motors. Additionally, they serve as lightweight, high-strength structural supports, insulating sleeves, or corrosion-resistant piping in the aerospace, rail transit, and chemical industries.
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.
We are a professional manufacturer of Epoxy Fiberglass Laminated Tubes, which can be customized according to your needs
| Number | Item | Unit | Value |
| 1 | Density | g/cm3 | 1.7-1.8 |
| 2 | Flexural Strength at Perpendicular Lamination （Under Normal） | MPa | ≥70 |
| 3 | Axial Compressive Strength | MPa | ≥60 |
| 4 | Breakdown Voltage at Parallel Lamination （Transformer Oil at 90℃） | Kv | ≥35 |
| 5 | Dielectric Strength at Perpendicular Lamination （Transformer Oil at 90℃） | KV/mm | 14.2 |
| 6 | Dielectric Loss Factor（50Hz） | – | ≤0.03 |
| 7 | Water Absorption | % | ≤1 |
| 8 | Thermal Index | – | 130 |
| Name | Unit | Value |
| Minimum Wall Thickness | mm | 2 |
| Maximum Wall Thickness | mm | 200 |
| Minimum Bore Size | mm | 6 |
| Maximum Bore Size | mm | 1200 |
| Length | mm | 1000-1200 |
