Filament wound tube is a glass-fiber and epoxy composite tube made by winding resin-impregnated reinforcement around a mandrel. It is used when an electrical assembly needs a rigid insulating sleeve with good mechanical strength, dimensional stability and low moisture absorption. The tube can be supplied for electrical protection components and other custom machined parts.
When to choose filament wound fiberglass tube
Filament winding is a practical choice for long, concentric tubes and for projects that require repeatable wall thickness. Buyers commonly specify it for fuse assemblies, arrester sleeves, link sticks, earth sticks, spacers, coil forms and other power-protection components. The material can be sawed, cut, drilled and machined; the final process should be checked against the customer’s drawing and tolerance requirements.
Material and available specifications
| Item | Current product data / options |
|---|---|
| Construction | Glass-fiber reinforcement with epoxy resin; filament-wound structure |
| Outside diameter | 8 mm to 800 mm listed; confirm drawing and tolerance before order |
| Maximum length | Up to 12 m listed; confirm transport and cutting requirements |
| Wall thickness | 0.5 mm to 10 mm listed; thin-wall designs may be reviewed from 0.45 mm |
| Colors | Red, white, light yellow and light green listed; confirm color and batch requirement |
| Customization | Diameter, length, wall thickness, color and machining route can be reviewed from a drawing |
| Existing reference values | Bending strength no less than 150 MPa and perpendicular dielectric strength above 8 kV/mm are stated in the legacy product data. Confirm the test method, specimen direction and acceptance value before use. |
Values in the table are a starting point for technical discussion, not a substitute for an approved datasheet. Please send the required standard, test method, operating temperature, voltage, dimensions and tolerance so the engineering team can confirm the correct grade.
Applications in electrical protection
Typical applications include high- and medium-voltage fuse components, current-limiting fuse boxes, arrester sleeves, insulation supports, spacers, coil forms and custom sleeves for power equipment. For a new design, check dielectric clearance, creepage distance, wall thickness, concentricity, machining allowance, moisture exposure and the assembly’s temperature cycle.
What to include in an RFQ
- Inside diameter, outside diameter, wall thickness and cut length
- Quantity, annual demand and packaging requirements
- Electrical, mechanical and temperature requirements, including the test method
- Machining features, drawing revision and permitted tolerances
- Color, surface finish, inspection documents and sample approval needs
For related composite insulation products, see vulcanized fibre composite fiberglass tube. For a quote, sample review or drawing check, visit the Fuse Tube contact page.
Download the product reference
Download the existing filament wound tube brochure and use it together with your drawing or specification. Ask us to confirm any value that is critical to your design before production.
Technical video
Frequently asked questions
What is a filament wound tube?
It is made by winding continuous glass fiber impregnated with epoxy or other resin around a mandrel, then curing, giving high strength-to-weight and consistent electrical insulation.
Where are filament wound tubes used?
They are used in fuse bodies, insulation structures, shafts and mechanical-electrical parts that need high hoop strength and low weight.
Request a quote
Send your drawing, voltage class, dimensions and quantity. Engineering review covers electrical, arc, moisture and mechanical requirements before production.