Our epoxy fiberglass filament-wound tubes are manufactured using high-quality continuous E-glass fibers impregnated with premium epoxy resin via an advanced wet-winding process. Designed specifically for high-voltage electrical equipment, these tubes offer superior mechanical strength, excellent dielectric properties, and outstanding machinability.
We offer both bulk supply of raw tubes and high-precision CNC custom machining services—including turning, slotting, drilling, and threading—fully compliant with your engineering specifications.

Key advantages of our filament-wound tubes:

1. Superior mechanical toughness: Compared to traditional rolled-fabric tubes, continuous filament winding offers higher hoop tensile strength.

2. Excellent dielectric properties: Low partial discharge (≤5) and high dielectric strength ensure reliable insulation performance under high-voltage, heavy-load conditions.

3. Precision CNC machining: Equipped with advanced CNC lathes to provide precise turning, custom grooving, drilling, and edge chamfering with strict tolerance control.

4. Environmental certification: 100% compliant with ISO9001, RoHS, and halogen-free environmental standards.

Winding angle: 45–65° (angle adjustable based on specific requirements to optimize mechanical properties)
Fiber content (by weight): 70–75%
Density: 2.00 g/cm³
Water absorption: <0.03%
Axial thermal expansion coefficient: 1.8 × 10⁻⁵ 1/K
Glass transition temperature: 110–120°C
Chemical resistance (mineral oil): Excellent
Resistance to solvents and dilute acids: Excellent
Tensile modulus: Axial 14,000 MPa
Tensile strength: Axial 280 MPa / Hoop 600 MPa
Shear strength: 150 MPa
Flexural strength: Axial 350 MPa
Compressive strength: Axial 240 MPa
Relative permittivity: 2–2.3
Dielectric loss factor: 0.003–0.015
Partial discharge level: ≤5
Dielectric strength: Axial 3–6 kV/mm, Radial 10–12 kV/mm
Lightning impulse withstand voltage: 110 kV
Power frequency withstand voltage: 50 kV
Thermal class: Class B, F, H
Dimensions/Specifications: Inner diameter > 5 mm,
Outer diameter < 300 mm,
Length < 2000 mm

Note: All dimensions and mechanical properties can be customized according to your specific structural and thermal application requirements (Class B, F, H).

Our G10/FR4 filament-wound components are the preferred choice for heavy-duty structural parts in high-voltage electrical equipment:

Power industry: Reactors, transformers, tap changers, and instrument transformers.

Surge protection: Lightning arresters and high-voltage fuses.

New energy and power grids: Smart grid insulated switchgear and busbar insulation bushings.

–With our CNC custom machining and wholesale capabilities, there is no need to waste time on in-house processing. We offer ready-to-use solutions:

1. Wholesale Pricing: Direct-from-factory wholesale of filament-wound raw tubing with customizable wall thicknesses and lengths.

2. Precision Machining: CNC turning, OD/ID grinding, custom threading, drilling, and boring based on CAD/PDF drawings or samples.

3. Surface Finish Options: Surface roughness tailored to your requirements, ranging from smooth and glossy to textured finishes. [Contact our engineering team today for a quick technical quote and sample evaluation!]