Fiberglass Filament Wound Tubes for Power Equipment: Applications and Selection Guide

Introduction to Glass Fiber Filament Wound Tubes Glass fiber filament wound tubes are composite insulating materials...

Introduction to Glass Fiber Filament Wound Tubes

Glass fiber filament wound tubes are composite insulating materials made from alkali-free glass fiber yarns impregnated with thermosetting resins such as epoxy or phenolic resin. They are manufactured by filament winding on a mold, followed by high-temperature curing.

The fibers are arranged in both circumferential and axial directions, forming a dense and uniform structure. This gives the tubes excellent mechanical strength, electrical insulation, heat resistance, and chemical resistance.

I. Application Areas and Typical Positions

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II. Selection Guidelines

1. Electrical Properties

Dielectric Strength: ≥10–20 kV/mm, sufficient for rated voltage class.

Volume Resistivity: ≥10^12 Ω·cm, ensuring long-term insulation.

Arc and Tracking Resistance: Suitable for high-voltage switchgear and circuit breakers.

2. Mechanical Properties

Flexural Strength: ≥300 MPa, to withstand electromagnetic and mechanical stress.

Compressive Strength: ≥250 MPa, for support and fixing components.

Low Density: Lightweight, ideal for replacing metal parts.

3. Thermal Resistance

Class F (155℃): Commonly used in transformers and switchgear.

Class H (180℃): For generators, traction motors, and high-temperature conditions.

Above 200℃: Custom options available for special applications.

4. Environmental Resistance

Moisture Resistance: Suitable for outdoor and humid environments.

Chemical Resistance: Applicable in energy storage and photovoltaic equipment.

Aging and Fatigue Resistance: Ensure long service life.

5. Dimensions and Processing

Diameter Range: Commonly φ10 mm – φ600 mm, larger sizes customizable.

Wall Thickness: 2 mm – 20 mm (depending on load and insulation requirements).

Machining Options: Turning, grinding, drilling, tapping for precise assembly.

III. Recommended Selection (Application – Parameters)

Summary

In power equipment, glass fiber filament wound tubes serve mainly as insulation, support, fixation, and load-bearing components.
Selection should comprehensively consider electrical properties (voltage class), mechanical strength (load requirements), environmental adaptability (heat, moisture, corrosion resistance), and dimensional accuracy, to ensure long-term safe and stable operation.