G5 / G9 Glass Melamine Laminate Sheet
High-strength, arc-resistant sheet for switchgear parts. Glass melamine (G5/G9) sheet brings high mechanical strength and arc resistance to switchgear parts that see load and clearing energy. We machine it to plate, barrier and structural shape with faces finished for assembly. Both are glass melamine; grade is set by temperature class and availability. We specify from service. Track-resistant, V-
High-strength, arc-resistant sheet for switchgear parts. Glass melamine (G5/G9) sheet brings high mechanical strength and arc resistance to switchgear parts that see load and clearing energy. We machine it to plate, barrier and structural shape with faces finished for assembly. Both are glass melamine; grade is set by temperature class and availability. We specify from service. Track-resistant, V-
Technical specifications
| Material | Glass-melamine (G5/G9) |
| Property | High mechanical, arc resistant |
| Use | Switchgear parts |
| Standard | ASTM D7049 (melamine), IEC 60269 (fuse dimensions), UL 94 V-0. |
| Operating temperature | -40 °C to +130 °C (arc-facing up to 155 °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
- Arc-chute and arc-barrier sheets in switchgear
- MV breaker tray and interphase barrier plates
- High-temperature transformer insulating plates
- Motor slot wedges and insulation sheets
- Arc-resistive covers in fuse and MCC compartments
- Shaped laminate parts requiring arc resilience and mechanical strength
Why glass melamine laminate for this application
Glass-melamine (G5 mechanical / G9 electrical, and 3233) is the sheet grade chosen where a flat barrier may see arc splatter or heat while still needing structural stiffness in distribution gear.
Hygroscopic when left unwrapped. Confirm G5 vs G9 vs 3233 against the mechanical and tracking duty; not a general-purpose cosmetic laminate.
Standards: ASTM D709, IEC 60893, UL 94 V-0.
Feature and remaining-wall review
CNC turning and milling for precise dimensions; brittle material requires sharp, low-speed tools. 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 standards apply to melamine tubes?
ASTM D7049 (melamine), IEC 60269 (fuse dimensions), UL 94 V-0. Material COA supplied per batch.
Can melamine be threaded?
Yes. CNC threading is possible but brittleness requires sharp, low-speed tools. Feature depth and remaining wall must be reviewed per drawing.
Is melamine suitable for arc-facing applications?
Yes, for moderate-energy arcs. For high-clearing-energy MV/HV fuses, use ceramic-filled or synthetic arc-quenching composites.
What tolerance can you hold?
ID/OD ±0.05 mm standard; ±0.02 mm available with precision grinding on straight, unwound sections.
G5 or G9 for arc duty?
ID/OD ±0.05 mm standard; ±0.02 mm available with precision grinding on straight, unwound sections.
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for G5 / G9 Glass Melamine Laminate Sheet
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.