Vulcanized Fiber (Fish Paper) Washers and Spacers
Arc-resistant washers and spacers punched or machined to drawing. Vulcanized fiber washers are the arc-resistant choice for fuse and switchgear joints. We punch or machine them to ID/OD and thickness. Punched washers are burr-free; machined ones hold tighter ID/OD for close-fit spacers. Punched for volume and burr-free edges; machined for tight ID/OD. We pick from tolerance.
Technical specifications
| Material | Vulcanized fiber (fish paper) |
| Property | Arc-resistant |
| Form | Punched or machined |
| Use | Fuse / switchgear washers |
💾 Datasheets & Test Reports
Download the technical data sheet for this product (PDF).
Applications by industry
- Insulating washers under panel and terminal screws
- Fish-paper spacer washers in relays and contactors
- Machine- and die-cut washers for LV assembly
- Bobbin and coil end washers
- Low-cost barrier washers between stacked terminations
- Custom OD/ID punched washers for hardware isolation
Why vulcanized fiber for this application
Vulcanized fibre washers isolate and center hardware in compact LV assemblies, and punch cheaply and cleanly at volume with stable dielectric per thickness.
Hydrophilic; washer swells if wet. Confirm stack compression and CTI in the surrounding duty.
Standards: ASTM D2491, UL 94 V-0 (grade dependent).
Feature and remaining-wall review
For Vulcanized Fiber (Fish Paper) Washers and Spacers, ID and OD are ground or turned and the CNC handles knurling, threading, slotting and cutting to drawing. Review of feature depth, edge distance and remaining wall happens pre-quotation, with capability confirmed against your drawing rather than a general 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.
G10 / FR-4 Epoxy Glass Washers
Related insulation component from the WELLELE catalog.
Vulcanized Fiber (Fish Paper) Sheet
Related insulation component from the WELLELE catalog.
Common questions
Where would you specify Vulcanized Fiber (Fish Paper) Washers and Spacers?
Typical applications are fuse / switchgear washers. Send the duty and the environment, and we will say whether this grade is the right one for Vulcanized Fiber (Fish Paper) Washers and Spacers.
Which material is Vulcanized Fiber (Fish Paper) Washers and Spacers manufactured from?
The material is Vulcanized fiber (fish paper). It is supplied as punched or machined. Alternate grades can be quoted against your drawing.
Is a material certificate of analysis provided for Vulcanized Fiber (Fish Paper) Washers and Spacers?
Yes. The material certificate of analysis travels with each batch of Vulcanized Fiber (Fish Paper) Washers and Spacers. First-article inspection and extra electrical testing are available when your specification lists them.
Can Vulcanized Fiber (Fish Paper) Washers and Spacers be produced to a customer drawing?
ID, OD and thickness are supplied to your drawing. Give us the drawing for Vulcanized Fiber (Fish Paper) Washers and Spacers 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) Washers and Spacers.
Get pricing for Vulcanized Fiber (Fish Paper) Washers and Spacers
Put the drawing and the annual volume into the enquiry for Vulcanized Fiber (Fish Paper) Washers and Spacers. We review the material against your duty and tolerance and check ID, OD, wall and features, then reply with what we can hold on Vulcanized Fiber (Fish Paper) Washers and Spacers and what it costs.