Custom Vulcanized Fiber Tubes for Fuse Links and Switchgear
Rolled and machined vulcanized fiber (fish paper) fuse bodies, thin-wall and small-diameter, to your drawing. Vulcanized fiber is the long-standing choice for LV cylindrical fuse bodies: it machines cleanly, resists arc, and holds tight ID/OD on thin walls. We roll or machine the tube from your dimensioned drawing and verify wall and straightness before shipment. Send the ID, OD, length, wall, tol
Rolled and machined vulcanized fiber (fish paper) fuse bodies, thin-wall and small-diameter, to your drawing. Vulcanized fiber is the long-standing choice for LV cylindrical fuse bodies: it machines cleanly, resists arc, and holds tight ID/OD on thin walls. We roll or machine the tube from your dimensioned drawing and verify wall and straightness before shipment. Send the ID, OD, length, wall, tol
Technical specifications
| Material | Vulcanized fibre (fish paper) |
| Density | 1.20 - 1.40 g/cm3 |
| Service temperature | Class B, up to ~130 degC |
| Dielectric strength | 10 - 15 kV/mm (through thickness) |
| Wall tolerance | +/-0.05 mm typical on thin wall |
| Moisture | Seal or wax-impregnate for humid duty |
💾 Datasheets & Test Reports
Download the technical data sheet for this product (PDF).
Information required for quotation
| Base tube | Approved material grade, ID, OD, wall and conditioning as per drawing |
| Datums | Drawing datum scheme and measurement reference |
| Key dimensions | Feature positions, depths, pitch and diameters reviewed before quotation |
| Thread / profile | Standard or custom profile, class, depth, engagement and gage method |
| Other features | Holes, slots, steps, chamfers, cuts and marking |
| Acceptance | Tolerances, sampling, gages, FAI and inspection report |
| Order | Prototype and production quantity, packaging and delivery target |
Applications by industry
- LV/MV fuse tube bodies and protective sleeves
- Knife-switch and load-break insulating tubes
- Arc-slide and dead-front switchgear covering tubes
- Transformer bushing insulator sleeves
- End-cap and ferrule base tube stock for fuse OEM
- General electrical insulating tubing for panels
Why vulcanized fiber for this application
Vulcanized fibre is the workhorse rigid tube for non-arc-facing electrical insulation: it combines real dielectric strength with machinability and a materially lower price than ceramic or epoxy-glass in LV to lower-MV service.
Not for direct arc-facing walls or continuous temp above ~105 °C. Hydrophilic — specify conditioning for tight tolerances and humid locations.
Standards: ASTM D2491, IEC 60269, UL 94 V-0 (material dependent).
Feature and remaining-wall review
ID/OD ground or turned; CNC knurling, threading, slotting and cutting to drawing. Feature depth and remaining wall reviewed pre-quotation. Review feature depth, edge distance and remaining wall against critical geometries. Capability is confirmed on your drawing, not from a blanket tolerance.
Inspection and traceability
We state the control plan with you. Batch traceability links raw material lot to finished part.
- First-article inspection (FAI) per your plan
- In-process dimensional checks at every station
- Batch certificate of conformance (COA) supplied on request
- Lot traceability to incoming material certificate
- Dielectric strength and insulation resistance testing available on request
Related components
Vulcanized Fiber Washers
Related insulation component from the WELLELE catalog.
Knurled & Screwed Vulcanized Fiber Tubes
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Vulcanized Fiber + Fiberglass Tubes
Related insulation component from the WELLELE catalog.
Common questions
What is the standard for vulcanized fiber tubes used in fuse assemblies?
Vulcanized fiber tubes for fuse bodies are referenced to IEC 60269 for body dimensions and end-cap geometry. Material follows ASTM D2491 (fish paper) and UL 94 V-0 for flammability. Specify the fuse link type and voltage class and we confirm the grade and tolerance.
What tolerance can you hold on vulcanized fiber tubes?
On thin-wall vulcanized fiber sections we typically hold ±0.05 mm on ID and OD. Knurl pitch, major/minor diameter and position are reviewed per drawing. Capability is confirmed against your print, not published as a blanket claim.
Is vulcanized fiber suitable for arc-facing fuse applications?
No. For arc-facing surfaces, use ceramic-filled epoxy glass, melamine or synthetic arc-quenching composites. Vulcanized fiber is for non-arc-facing mechanical bodies and end caps.
Can you supply COA and batch traceability?
Every batch is traceable to the incoming material certificate. Material COA, first-article inspection (FAI), in-process checks and final inspection reports are supplied per your plan on request.
Do you supply vulcanized fiber tube with wax impregnation?
Every batch is traceable to the incoming material certificate. Material COA, first-article inspection (FAI), in-process checks and final inspection reports are supplied per your plan on request.
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for Custom Vulcanized Fiber Tubes for Fuse Links and Switchgear
Attach the drawing with annual volume. We check the material against your duty and tolerance, verify ID / OD / wall / features, and respond with manufacturability notes and pricing.