Phenolic Cotton Cloth Laminated Sheets
Machinable phenolic plate for mechanical insulating parts. Phenolic cotton sheet is the economical, machinable choice for mechanical insulating parts that are not arc-facing. We cut, punch and machine it to plate and component shape with tight hole position. Generally no. Use GPO-3 or melamine where arc or track resistance is required. Machinable phenolic rods for mechanical insulating parts. Trac
Machinable phenolic plate for mechanical insulating parts. Phenolic cotton sheet is the economical, machinable choice for mechanical insulating parts that are not arc-facing. We cut, punch and machine it to plate and component shape with tight hole position. Generally no. Use GPO-3 or melamine where arc or track resistance is required. Machinable phenolic rods for mechanical insulating parts. Trac
Technical specifications
| Material | Phenolic cotton cloth laminate |
| Property | Good mechanical, machinable |
| Use | Mechanical insulating parts |
| Standard | ASTM D7049 (GPO-3), UL 94 V-0 (standard grade), IEC 60672. |
| Operating temperature | -40 °C to +150 °C |
| Dielectric strength | ≥ 20 kV/mm (per ASTM test method) |
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
- Insulating panels in machine tool and starter enclosures
- Silent gear and pulley blank stock
- Electrical-machine spacer and barrier sheets
- Locomotive/rolling-stock insulation plates
- Fixtures and tooling boards needing machining edge
- Custom thick sheets for body and chassis insulation
Why phenolic cotton laminate for this application
Thick cotton phenolic sheets are chosen where a barrier plate must stay flat, machine true and take impact — common in rail and machine tooling rather than pure HV tracking duty.
Confirm panel bow and moisture uptake; specify sealed edges for precision cutouts. Lower tracking index than glass grades.
Standards: ASTM D709, IEC 60893-3-4.
Feature and remaining-wall review
ID/OD ground or turned; diamond tools for slotting and drilling to avoid delamination. 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
Phenolic Cotton Cloth Laminated Rod
Related insulation component from the WELLELE catalog.
GPO-3 Polyester Glass Sheet
Related insulation component from the WELLELE catalog.
Bakelite Plate (Orange / Black)
Related insulation component from the WELLELE catalog.
Common questions
Is GPO-3 flame retardant?
Yes, standard GPO-3 grades meet UL 94 V-0 without additional flame retardants.
Can GPO-3 be machined?
Yes. CNC turning, drilling and slotting with diamond-coated tools to prevent delamination. Tolerances to ±0.05 mm on ID/OD.
What applications suit GPO-3?
Switchgear barriers, motor winding supports, insulating plates and structural components where mechanical strength and flame retardancy are required.
Do you provide material certificates?
Yes. Each batch includes a COA. RoHS and REACH compliant on request.
Phenolic sheet for arc-facing?
Yes. Each batch includes a COA. RoHS and REACH compliant on request.
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for Phenolic Cotton Cloth Laminated Sheets
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.