Vulcanized fiber tube is a dense cellulose-based electrical insulation tube made by winding zinc-chloride-treated paper plies on a mandrel, then drying, conditioning and finishing to the approved drawing. It pairs electrical insulation with good machinability and arc-handling behavior, which is why fuse, bushing and insulator designers keep specifying it. We are a direct vulcanized fiber tube manufacturer supplying prototype and production quantities with low minimum order quantities and short sampling lead times for fuse, EV, photovoltaic and industrial programs.
Why engineers and buyers specify vulcanized fiber tubes
Most inquiries reach us with the same few problems. A previous supplier set the MOQ too high for a new fuse design, so development units are hard to buy. Lead times slip the moment a drawing changes. Wall-thickness tolerance drifts between batches and the supplier cannot explain it. Or the component needs a material data sheet plus RoHS and REACH documentation, and the current source cannot supply it. We address those directly: low MOQ and fast sampling for development builds, tolerances tied to your drawing and recorded per batch, and the test reports and compliance files needed for component qualification.
How vulcanized fibre tubing is made
The tube starts as zinc-chloride-treated paper wound to a predetermined wall thickness. It then passes through washing or conditioning, drying, rolling and dimensional finishing. Inside and outside diameters can be ground or sanded to the approved drawing. The outside surface may also be knurled or skived when the tube will be combined with a fiberglass overwrap, which is a common route for vulcanized fiber composite fiberglass tubes.
Available sizes and customization
| Item | Current product data / options |
|---|---|
| Material | Vulcanized cellulose fiber |
| Inside diameter | 5 mm to 65 mm listed; confirm tolerance and measuring method |
| Length | 8 mm to 1000 mm listed |
| Colors | Gray, black and red listed; confirm color requirement before sampling |
| Surface options | Smooth, knurled or rolled thread, subject to drawing review |
| Machining | Cutting, drilling, inside/outside threading, turning, polishing and other features can be reviewed |
| Legacy density reference | Approximately 1.40 g/cm³ is stated in the existing product data; confirm the applicable grade and test method |
Final dimensions and performance should be agreed from a controlled drawing or specification. For electrical protection designs, state the required dielectric test, arc exposure, moisture condition, operating temperature and mechanical load. Do not select a grade from density or color alone.
Typical electrical applications
Common applications include fuse cartridges, fuse links, high-voltage cutout fuse liners, lightning arrester components, grommets, bushings, coil forms, motor insulation, switch insulation, terminal strips and transformer insulation. The material can be sanded, knurled, spiral-cut, threaded and turned, which helps when the component needs a finished bore, shoulder or external surface for a cylindrical fuse format or an insulating bushing.
What engineers should confirm before ordering
- Inside diameter, outside diameter, wall thickness, length and tolerances
- Fuse or equipment application, voltage class and operating environment
- Required electrical, arc, mechanical and moisture-conditioning tests
- Surface treatment, machining features and inspection method
- Sample quantity, production quantity, packaging and traceability documents
If the design needs a fiberglass outer structure, compare this product with the vulcanized fibre composite fiberglass tube. To request a sample, drawing review or quotation, use the contact page.
Explore the full fuse tube range
This construction is part of our custom fuse tube range. Related constructions: filament wound tube, G5/G9 glass melamine tube, synthetic arc quenching liner. For parts that insulate motors, transformers and switchgear, see the electrical insulation tube guide.
Frequently asked questions
What is a vulcanized fiber tube used for in fuse design?
A vulcanized fiber tube works as the insulating and arc-handling sleeve inside fuse cartridges, fuse links, high-voltage cutout liners and lightning arrester parts. It delivers electrical insulation while staying machinable for finished bores, shoulders and threads.
Can you supply a custom inside diameter and length?
Yes. Inside diameters from 5 mm to 65 mm and lengths from 8 mm to 1000 mm are listed, and custom wall thickness, tolerances and surface finish are reviewed against your drawing.
What is the minimum order quantity and sampling lead time?
We support low MOQ for development and bridge production, and we can usually turn around machined samples within a short lead time after drawing review. Tell us your prototype quantity and target date and we will confirm a realistic schedule.
Do you provide material data sheets, test reports and compliance files?
Yes. A product brochure carries the existing reference data, sample units are available, and we can supply RoHS and REACH documentation and the test reports needed for component qualification. Confirm any safety-critical value with the engineering team before ordering.
Which certifications apply to your tubes?
Our plant operates an ISO 9001 quality management system, and SGS material testing is available for the constructions you specify. Tell us about any customer-specific requirements such as UL recognition, RoHS or REACH and we will supply the documentation package your quality team needs for component qualification.
Request a quote for custom vulcanized fiber tubes
Send your drawing, voltage class, dimensions and quantity. Engineering review covers dielectric, arc, moisture and mechanical tests before production. As a custom vulcanized fiber tube supplier we work from your drawing rather than from a catalog, so the first step is a short drawing review.
Download the vulcanized fiber tube brochure
The brochure contains the existing product reference data. Confirm any safety-critical or design-critical value with the engineering team before placing an order.
