phenolic cotton cloth tube VS phenolic paper tube

Both phenolic cotton cloth tube and phenolic paper tube are thermosetting laminated tubes with phenolic resin as adhe...

Both phenolic cotton cloth tube and phenolic paper tube are thermosetting laminated tubes with phenolic resin as adhesive, but there are significant differences between the two in terms of base material, performance and application scenarios. The specific differences are as follows:

Raw materials and structural differences

‌Phenolic cotton cloth tube‌

‌Base material‌: Pure cotton cloth (such as 32-count cotton cloth) is impregnated with phenolic resin.

‌Structural features‌: The cotton cloth fiber texture can be seen in the cross section, and the surface is striped and finely latticed.

‌Manufacturing process‌: After hot pressing, winding, baking and curing, a release agent (such as paraffin) is required to assist in demolding.

‌Phenolic paper tube‌

‌Base material‌: Insulating winding paper (such as corrugated paper for electrical use) is impregnated with phenolic resin.

‌Structural features‌: Uniform texture, no traces of cloth texture, and smooth surface.

‌Manufacturing process‌: Made by heating, rolling, pressing, baking and curing, slight wrinkles or bubbles are allowed on the inner wall.

Performance characteristics comparison

Main application scenarios

‌Phenolic cotton cloth tube‌:

High-speed bearing cage (such as radial thrust ball bearing);

Hydraulic cylinder wear-resistant guide ring, mechanical seal;

Engineering machinery wear-resistant parts (replacing metal, reducing weight by 80%).

‌Phenolic paper tube‌:

Insulation skeleton or parts of oil-immersed equipment such as transformers and mutual inductors;

Insulation structure of low-voltage electrical appliances (such as wiring baffles, fuse housings);

Motor winding support (dry or oil environment).

Specifications and standards

phenolic‌ Cotton cloth tube‌: inner diameter 5–800mm, length up to 1000mm, implementation standards such as JB/T4037-851;

phenolic Paper tube‌: inner diameter 5–1200mm, wall thickness 1–50mm, implementation standards such as JB/T3172-199946.

Summary

Phenolic cotton cloth tubes are dominated by mechanical properties and are suitable for high-strength and wear-resistant scenarios; phenolic paper tubes are centered on insulation performance and specialize in the insulation support needs of electrical equipment. When choosing, you need to make a comprehensive judgment based on mechanical load, environmental medium (oil/humidity) and electrical requirements.