Fish Paper Electrical Vulcanized Fiber

Electrical fish paper, also known as fishpaper or electrical-grade vulcanized fibre, is a strong cellulose-based insulation material used in motors, transformers, generators, switches, batteries and electrical appliances.

Unlike PET film laminated insulation paper, electrical fish paper is not a paper-film composite. It is manufactured from high-purity cellulose fibres that are chemically treated, pressed and bonded into a dense, durable material without synthetic resin or adhesive binder.

The material combines good dielectric insulation, mechanical strength, tear resistance and excellent punching performance. It can be supplied in rolls, sheets, strips or customized die-cut insulation parts.

Xuchang Chengrui Insulation Material Co., Ltd. supplies electrical fish paper for electrical equipment manufacturers, motor repair companies, insulation component processors and industrial distributors.

What is Electrical Fish Paper?

Electrical fish paper is the commercial name for vulcanized fiber, a dense, homogeneous material produced by chemically treating cotton rag or wood pulp paper with zinc chloride. The vulcanization process partially dissolves and rebonds the cellulose fibers, forming a continuous, non-laminated sheet that is far tougher than the original paper. The result is a hard, durable material offering excellent electrical insulation properties and remarkable mechanical toughness.

Despite its unusual name, this material has no connection to aquatic life. Historically, it was dubbed "fish paper" because its smooth, flexible surface and grayish-white appearance closely resembled the skin of certain fish. While some speculate that early manufacturing facilities may have been located near fisheries, industry veterans generally agree that the name stems from its visual resemblance to fish skin. For a deeper dive into the origins of the name, please refer to this detailed article on the history and applications of fish paper.

Main Features

1. Good Electrical Insulation: Electrical fish paper provides reliable dielectric insulation between metal components, windings, terminals and conductive parts.

2. High Mechanical Strength: Its dense cellulose structure offers good tensile strength, tear resistance and impact resistance, helping the material withstand assembly, bending and long-term mechanical stress.

3. Excellent Punching and Forming: Fish paper can be punched, folded, scored, slit, cut and formed into complex insulation components without easily cracking or separating.

4. Lightweight Construction: The material provides electrical and mechanical protection without significantly increasing the weight of the finished equipment.

Available Forms

1. Fish Paper Rolls: Suitable for automatic punching, continuous processing, coil winding insulation and converting operations.

Roll width, thickness, length and core size can be customized according to production requirements.

2. Fish Paper Sheets: Sheets are suitable for manual cutting, CNC processing, prototyping and the production of larger insulation components.

Standard or customized sheet sizes are available.

3. Slit Fish Paper Coils: Narrow-width coils can be supplied for motor slot insulation, winding protection and automatic production lines.

4. Die-Cut Fish Paper Parts: Fish paper can be converted into Insulating washers, Battery insulation rings, Switch insulation plates and Customized punched components

Electrical Fish Paper vs PET Laminated Paper

Electrical fish paper is a cellulose-based vulcanized fibre material.

PET laminated insulation paper normally consists of electrical paper bonded to polyester film. It is a composite insulation material and should not be described as genuine fish paper.

Frequently Asked Questions

Q1: Is electrical fish paper the same as vulcanized fibre?

A: Electrical fish paper generally refers to the electrical grade of vulcanized fibre. Vulcanized fibre also includes commercial, mechanical and specialized grades, so not every vulcanized fibre product is necessarily electrical fish paper.

Q2: Does electrical fish paper contain PET film?

A: No. Genuine electrical fish paper is electrical-grade vulcanized fibre without a PET film layer. Products made from electrical paper laminated with PET film belong to a different composite insulation material category.

Q3: Can fish paper be supplied with adhesive?

A: Yes. Plain fish paper can be laminated with pressure-sensitive adhesive for easier installation and die-cut component assembly.

The adhesive type should be selected according to the required temperature resistance, bonding surface and operating environment.