Phenolic cotton cloth tube Yarn count difference and selection

The "yarn count" in the phenolic cotton cloth tube (also known as phenolic cloth tube, phenol cotton tube) refers to ...

The “yarn count” in the phenolic cotton cloth tube (also known as phenolic cloth tube, phenol cotton tube) refers to the thickness of the yarn in the cotton cloth used, that is, the “yarn count”. This is an indicator to measure the fineness of the cotton cloth, and has a significant impact on the performance, appearance, cost, etc. of the final phenolic cotton cloth tube.

The following are the main differences between different yarn counts:

 1.Common Yarn Counts and Their Characteristics

Yarn Count	Features	Application Traits
21s (20~24s)	Coarse yarn, high strength, low cost	Rough surface, suitable for structural parts requiring high mechanical strength
28~32s	Balanced precision and strength	Good balance between mechanical and insulation properties, commonly used standard type
40s and above	Fine yarn, smooth surface, better resin penetration	Excellent electrical performance, ideal for high-precision electrical parts

2. How to Choose the Right Yarn Count?

Based on Performance Requirements:

Application Needs	Recommended Yarn Count	Reason
High mechanical strength (e.g., motor shaft sleeves, impact-resistant parts)	Around 21s	Coarser yarn provides greater strength
High electrical insulation (e.g., high-voltage insulation tubes)	32s or 40s	Finer yarn enables more uniform resin impregnation and better electrical properties
High surface smoothness (e.g., visible parts, precision electronic structures)	≥40s	Fine fabric texture with minimal yarn marks
Cost-sensitive projects	21s–28s	More economical while meeting basic requirements
Custom complex sizes or heavy post-processing	28s–32s	Better processability and stable performance

Based on Industry and Application Scenario:

Industry	Recommended Yarn Count	Reason
Motor/Transformer Manufacturing	28s–32s	Balances insulation and structural performance
Machinery/Structural Parts	Around 21s	Emphasizes strength and cost-efficiency
High-end Electronics/Rail Transit Equipment	≥40s	Demands high precision and insulation

3.Impact of Yarn Count on Phenolic Cotton Cloth Tubes

Item	Low Yarn Count (e.g., 21s)	High Yarn Count (e.g., 32s, 40s)
Yarn Thickness	Coarse	Fine
Fabric Surface Appearance	Rough, pronounced texture	Smooth, fine, and flat
Mechanical Strength	Higher (due to thicker yarn)	Lower (but more uniform)
Wear Resistance	Strong	Slightly weaker
Resin Impregnation Capability	Better penetration	Slower penetration
Insulation Performance	Slightly lower	Slightly higher
Cost	Lower	Higher
Suitable Applications	High strength required, appearance not critical	High insulation and surface quality required

4. Tips

Higher yarn counts mean higher cost: Both material cost and processing difficulty increase with finer yarns.

Higher is not always better: Excessively fine yarn may reduce strength and increase unnecessary cost.

Check supplier specifications: Yarn types may vary between manufacturers; it’s best to evaluate actual samples.