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Epoxy Glass Cloth Wrapped Tube

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Description

1. Product Introduction

Epoxy Glass Cloth Wrapped Tube, also named epoxy fiberglass winding tube or EPGC laminated tube, is a high-strength electrical insulation composite pipe. It is produced by winding alkali-free E-grade glass cloth pre-impregnated with epoxy resin onto a mandrel, followed by staged temperature heating and full curing. It is the key insulating component widely used in high-voltage power equipment.

2. Production Process

  1. Base material: Silane-treated alkali-free glass fabric fully soaked with low-viscosity epoxy resin
  2. Winding: Multi-layer cross winding with adjustable winding angles (30°/45°/60°) under computer control
  3. Curing: Stepwise far-infrared heating and integrated thermal molding
  4. Finishing: Precision cutting, surface polishing and end sealing to guarantee air tightness and dimensional accuracy

3. Core Advantages

Electrical Insulation Performance

  • High dielectric strength: 10~12kV/mm radial breakdown strength, 3~6kV/mm axial breakdown strength
  • Low dielectric loss: Loss factor ≤0.015 at 50Hz, partial discharge ≤5pC
  • Multiple heat resistance grades optional: Class B (130℃), Class F (155℃), Class H (180℃)
  • Excellent oil and moisture resistance: Water absorption less than 0.03%, stable operation in transformer oil and humid conditions long-term

Mechanical Strength

  • High hoop tensile strength up to 600MPa, outstanding bending, compression and impact resistance, far better than ceramic and ordinary plastic tubes
  • Light weight: 30% lighter than aluminum alloy, anti-seismic and crack-resistant for vibrating outdoor working conditions
  • Ultra-low thermal expansion coefficient, no deformation or cracking under high temperature and high pressure

Chemical & Weather Resistance

Resist dilute acid, alkali, organic solvents, SF6 arc decomposition gas and mineral transformer oil. Halogen-free and RoHS compliant, anti-aging for long-time outdoor exposure.

Customization & Machinability

Supports turning, milling, drilling and grooving. Customizable inner diameter φ5~1500mm, wall thickness 1~30mm, maximum length 2000mm. Available in yellow, green, black surface colors.

4. Typical Technical Parameters

Test Item Typical Value
Density 1.65~2.1 g/cm³
Water Absorption ≤0.03%
Flexural Strength ≥350 MPa
Radial Dielectric Strength 10~12 kV/mm
Continuous Operating Temperature -40℃ ~ 180℃
Glass Fiber Content 70%~75%

5. Application Fields

  1. High Voltage Power Transmission Equipment

    GIS, SF6 circuit breakers, transformer hollow bushings, lightning arrester inner insulation cylinders, reactor frameworks, transformer tap changer insulating tubes, applicable for 10kV to 550kV power systems.

  2. General Electrical Equipment

    Insulating supports for switch cabinets, insulating frames for capacitors, insulating sleeves for rectifiers.

  3. New Energy Industry

    Insulating structural parts for wind turbine towers, high-voltage insulation components of PV inverters and energy storage converters.

  4. Special Industrial Scenarios

    High-temperature metallurgical equipment, insulating supports for aluminum electrolysis, medical high-voltage instruments, traction equipment for rail transit.

6. Product Distinction

  1. Epoxy Glass Cloth Wrapped Tube: Wound with glass cloth tape, uniform wall thickness, excellent air tightness, superior voltage resistance and mechanical strength, preferred for high-voltage core insulation.
  2. Fiberglass Roving Wound Tube: Wound with glass fiber roving, lower cost, only for low-voltage ordinary support structures.
  3. 3640 Epoxy Laminated Tube: Standard glass cloth pipe formed by rolling and hot pressing.