G5 / G9 Melamine Tubes for Arc-Resistant Fuse Bodies
Glass-melamine tubes with high mechanical strength and arc resistance. Melamine glass (G5/G9) tubes bring high mechanical strength and arc resistance to fuse bodies and insulating sleeves. They hold dimension under clamp load better than paper-based grades. We machine G5/G9 tube to your ID/OD/length and finish the surfaces for the assembly. Grade is chosen against temperature class and arc duty. B
Glass-melamine tubes with high mechanical strength and arc resistance. Melamine glass (G5/G9) tubes bring high mechanical strength and arc resistance to fuse bodies and insulating sleeves. They hold dimension under clamp load better than paper-based grades. We machine G5/G9 tube to your ID/OD/length and finish the surfaces for the assembly. Grade is chosen against temperature class and arc duty. B
Technical specifications
| Material | Glass-melamine laminate (G5/G9) |
| Temp class | Class B/E per grade |
| Properties | High mechanical, arc resistant |
| Form | Machined tube / sleeve |
💾 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
- Arc-resistant fuse bodies for MV switchgear
- HRC fuse link barrels where arcs strike the wall
- Circuit-breaker insulating arc chutes (tube form)
- Motor-starting fuse bodies in repetitive duty
- Transformer and capacitor MV fuse barrels
- Fuse tubes machined with arc-steering channels
Why glass melamine for this application
Glass-melamine (G5/G9) is specified where the fuse wall is expected to see arc hop: it ablates predictably and resists carbon tracking far better than organic fibre.
Hygroscopic profile — keep out of wet switchgear. Confirm the G5 vs G9 grade (mechanical vs electrical) against the drawn duty.
Standards: ASTM D709, IEC 60269, IEC 60672.
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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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.
Is G5 or G9 better for arc duty?
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 G5 / G9 Melamine Tubes for Arc-Resistant Fuse Bodies
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.