Shaped High-Voltage Casing Parts in FR-4 / G10
Machined casing, bushing and insulator shapes from wound epoxy glass. Casing and bushing parts are wound tube taken to a finished shape: tapers, steps, grooves and bores machined to the assembly drawing. We hold concentricity between bores and OD so the part centers in its housing. Creepage is cut or molded to your requirement. Yes. Tapers, steps, grooves and bores are CNC machined; we hold bore-t
Machined casing, bushing and insulator shapes from wound epoxy glass. Casing and bushing parts are wound tube taken to a finished shape: tapers, steps, grooves and bores machined to the assembly drawing. We hold concentricity between bores and OD so the part centers in its housing. Creepage is cut or molded to your requirement. Yes. Tapers, steps, grooves and bores are CNC machined; we hold bore-t
Technical specifications
| Material | FR-4 / G10 epoxy glass |
| Form | Machined casing / bushing |
| Control | Bore-to-OD concentricity |
| Creepage | Cut or molded to drawing |
💾 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
- Machined HV insulator housings and cover plates
- MV switchgear arc-shield profiles and phase barriers
- Transformer tap-changer insulating parts
- Contactor and bushing spacer blocks
- Shaped casing parts for pole-mount cutouts
- Custom-machined dielectric brackets in utility equipment
Why FR-4 / G10 epoxy glass for this application
FR-4/G10 machines into stable, low-CTI insulating profiles with predictable dielectric and mechanical values, and the shape is cut to your drawing rather than forced onto a stock profile.
Sharp machined corners are stress risers in HV — keep radii per class. Confirm CTI and tracking class against polluted environments.
Standards: IPC-4101 / ASTM D709, IEC 60672, UL 94 V-0.
Feature and remaining-wall review
Diamond-coated tools for clean edges; CNC turning, grinding and drilling to drawing. Dimensional stability excellent with controlled moisture content. 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-Wound Epoxy Tubing
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PV Insert Epoxy Fiberglass Tubes
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ECR Epoxy Fiberglass Rods
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Common questions
What voltage class can epoxy glass handle?
Dielectric strength ≥ 20 kV/mm. Voltage rating depends on thickness, geometry and safety factor — your drawing determines the insulation level.
Can epoxy glass be machined to tight tolerances?
Yes. We hold ±0.05 mm on ID/OD with CNC turning and grinding using diamond-coated tools to avoid delamination.
Is epoxy glass arc-resistant?
It has good arc resistance but is not arc-quenching. For direct arc contact, pair with ceramic-filled or synthetic arc-quenching composites.
What certifications do you provide?
Material COA, batch traceability, first-article and final inspection per your plan. Certificates comply with RoHS and REACH on request.
Can you machine tapers and grooves in the tube?
Material COA, batch traceability, first-article and final inspection per your plan. Certificates comply with RoHS and REACH on request.
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for Shaped High-Voltage Casing Parts in FR-4 / G10
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.