Is a Cold punching sheet phenolic cotton cloth laminate or phenolic paper laminate?

Cold punching sheets are typically made of phenolic paperboard, not phenolic cloth. Phenolic paperboard, with its exc...

Cold punching sheets are typically made of phenolic paperboard, not phenolic cloth. Phenolic paperboard, with its excellent electrical properties, mechanical strength, and processability, is a more suitable material for cold punching sheets.

Basic Concepts of Cold Punching Sheets

Cold punching sheets are laminated sheets made by impregnating bleached wood pulp paper with phenolic resin and hot pressing at high temperatures. They exhibit excellent mechanical and dielectric properties. This material can be punched and sheared stably at room temperature and has a temperature resistance range of 150°C to 300°C, making it suitable for humid environments and transformer oil applications. As a core insulation material for electronic and electrical products, its typical applications include FPC reinforcement, PCB test fixtures, and carbon film printed circuit boards.

Why Cold Punching Sheets Are Usually Made of Phenolic Paperboard

As an electrical insulation material, cold punching sheets must meet certain electrical performance, mechanical strength, and processability requirements. Phenolic paperboard excels in these areas, especially its excellent processability and low cost, making it an ideal choice for cold punching sheets. Phenolic paperboard also offers excellent oil, acid, and water resistance, meeting the requirements for cold punching sheets in various environments. II. Comparison of the Characteristics of Phenolic Cloth Board and Phenolic Paperboard
1. Phenolic Cloth Board: Phenolic cloth board is made from fiberglass cloth, impregnated with phenolic resin, and then hot-pressed. It has high mechanical strength and heat resistance, but is difficult to process and relatively expensive.
2. Phenolic Paperboard: Phenolic paperboard is made from wood cellulose paper, also impregnated with phenolic resin, and then hot-pressed. Phenolic paperboard has excellent electrical properties, mechanical strength, and processability, and is relatively low in cost, making it widely used in electrical insulation.

Comparison Between Phenolic Cotton Cloth Laminate and Phenolic Paper Laminate

Item	Phenolic Cotton Cloth Laminate	Phenolic Paper Laminate (Cold-punched board)
Base Material	Cotton fabric + phenolic resin	Electrical paper + phenolic resin
Mechanical Strength	High, excellent impact resistance, wear resistance, and bending strength	Moderate, suitable for light-load structural parts
Processing Method	Requires machining (turning, milling, drilling, etc.)	Can be cold-punched into shape, high processing efficiency
Electrical Properties	Medium insulation properties, lower than paper laminate	Excellent electrical insulation, high dielectric strength
Heat Resistance	Good, stable under higher temperatures	Average, properties decline under moisture
Wear Resistance	Excellent, can replace some metal parts	Poor, not suitable for friction parts
Main Advantages	High strength, good toughness, wear resistance, heat resistance	Excellent electrical properties, low cost, suitable for stamping
Main Disadvantages	Electrical properties are inferior to paper laminate, higher processing cost	Lower mechanical strength, poor wear resistance
Typical Applications	Gears, bearing cages, friction plates, mechanical structural parts, wear-resistant insulating components	Gaskets, insulation spacers, stamped parts for switchgear/transformers, motor insulation parts

Recommendations for Selecting Cold-Punched Board

When selecting cold-punched board, in addition to considering the material (phenolic paperboard or phenolic cloth board), the following factors should also be considered:
1. Electrical Performance: Select the appropriate electrical performance level based on the specific application scenario.
2. Mechanical Strength: Ensure that the selected cold-punched board has sufficient mechanical strength to support equipment operation.
3. Processing Performance: Consider factors such as the ease of processing and yield of the cold-punched board. 4. Cost: Choose a product with the best value for money, while meeting performance requirements.

In summary, cold-punched panels are typically made of phenolic paperboard rather than phenolic cloth. When choosing a cold-punched panel, consider factors such as electrical performance, mechanical strength, processing performance, and cost to select the best product for your needs.