Vulcanized Fiber (Fish Paper) Sheet
Fish-paper sheet for arc-facing and formed insulation parts. Vulcanized fiber sheet is formed, punched and machined for arc-facing insulation: barriers, arc chutes and gaskets. We supply it cut, punched and formed to the part drawing. Yes. It forms and punches well and resists arc, so it is used for arc chutes and barriers.
Technical specifications
| Material | Vulcanized fiber (fish paper) |
| Property | Arc-resistant, formable |
| Use | Arc-facing parts |
| 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).
Applications by industry
- Fish-paper insulation sheets for LV panel and relay duty
- Transformer interlayer and core insulation paper
- Motor and generator slot-line insulation sheets
- Bobbin and spool flat-wound barrier material
- Punchable insulating sheets for small appliance relays
- Non-arc-facing low-cost sheet insulation
Why vulcanized fiber for this application
p>Vulcanized fish paper is the classic low-cost dense insulator sheet. It punches and die-cuts flat, grips the coil, and isolates at LV/motor temperatures without the cost of glass laminate. it punches and die-cuts flat, grips the coil, and isolates at LV/motor temperatures without the cost of glass laminate.Not arc-facing, low continuous temp (~105 °C) and moisture-sensitive; confirm dielectric per thickness. Specify conditioned roll stock for punching.
Standards: ASTM D2491, IEC 60672, UL 94 V-0 (grade dependent).
Feature and remaining-wall review
Vulcanized Fiber (Fish Paper) Sheet is ground or turned on ID and OD, with CNC knurling, threading, slotting and cutting to drawing. Before quotation we check feature depth, edge distance and remaining wall against the critical geometries, and capability is confirmed on your drawing rather than 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
Custom Vulcanized Fiber Tubes
Related insulation component from the WELLELE catalog.
Vulcanized Fiber Washers
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Vulcanized Fiber (Fish Paper) Rod
Related insulation component from the WELLELE catalog.
Common questions
Which grade of Vulcanized Fiber (Fish Paper) Sheet do I need?
Give us the service conditions for Vulcanized Fiber (Fish Paper) Sheet: voltage, temperature and the loads it has to carry. We point you to the grade in the table above, and where the duty is unusual we say so rather than guess.
What material is used for Vulcanized Fiber (Fish Paper) Sheet?
The material is Vulcanized fiber (fish paper). Alternate grades can be quoted against your drawing.
Is material certification supplied with Vulcanized Fiber (Fish Paper) Sheet?
Yes. Every batch of Vulcanized Fiber (Fish Paper) Sheet carries a material certificate of analysis, and we can add first-article inspection and further electrical testing if your specification asks for them.
Can Vulcanized Fiber (Fish Paper) Sheet be made to our drawing?
Thickness and sheet size are supplied to your drawing. Give us the drawing for Vulcanized Fiber (Fish Paper) Sheet with the target quantity and we will confirm feasibility and price.
Engineering Guides & Selection Notes
Related reading on the selection and specification decisions behind Vulcanized Fiber (Fish Paper) Sheet.
Get pricing for Vulcanized Fiber (Fish Paper) Sheet
Send the drawing for Vulcanized Fiber (Fish Paper) Sheet with your annual volume. We check the material against the duty and tolerance on it, verify ID, OD, wall and features, then come back with manufacturability notes and pricing for Vulcanized Fiber (Fish Paper) Sheet.