Vulcanized Fiber and Fiberglass Combination Tubes
Fiber inner with fiberglass reinforcement for stronger thin-wall bodies. Reinforcing vulcanized fiber with a fiberglass layer raises the thin-wall strength without losing machinability. We use this combination where the body sees both arc and hoop load. Layer thickness and sequence follow the load path on your drawing. We confirm the stack during the engineering review. When a thin wall must carry
Fiber inner with fiberglass reinforcement for stronger thin-wall bodies. Reinforcing vulcanized fiber with a fiberglass layer raises the thin-wall strength without losing machinability. We use this combination where the body sees both arc and hoop load. Layer thickness and sequence follow the load path on your drawing. We confirm the stack during the engineering review. When a thin wall must carry
Technical specifications
| Material | Vulcanized fiber + fiberglass layer |
| Purpose | Thin-wall strength + arc resistance |
| Form | Combination tube |
| Standard | ASTM D2491 (vulcanized fiber), IEC 60269 (fuse dimensions), UL 94 V-0 (flammability, material dependent). |
| Operating temperature | -40 °C to +105 °C |
| Dielectric strength | ≥ 20 kV/mm (per ASTM test method) |
💾 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
- Drop-out fuse bodies for MV/LV distribution networks
- Expulsion-type fuse tube assemblies
- Arc-quenching structural components for switchgear
- Fuse end caps with fibre core and glass strength
- Compensating fuse tubes combining arc and strength
- Custom fuse link bodies with machined external profiles
Why vulcanized fiber + fiberglass for this application
Combining vulcanized fibre with a fiberglass ply buffers the fragile fibre side while adding structural handling strength for outdoor cutouts that see mechanical strain plus arc
Bond integrity at the fibre/glass interface drives life; request bond samples before volume. Confirm arc face orientation.
Standards: ASTM D2491 + D709, IEC 60269, ANSI C37.47.
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
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Filament Fiberglass Wound Tubing
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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.
When combine fiber with fiberglass?
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 Vulcanized Fiber and Fiberglass Combination Tubes
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.