Classification and numbering instructions for industrial felts

Industrial felts are divided into 4 categories according to the raw materials used:

 

1. Classification

 

Industrial felts are divided into 4 categories according to the raw materials used:

 

1.1. Fine felt (mainly first-grade wool)

1.2. Semi-coarse felt (mainly second- and third-grade wool)

1.3. Coarse felt (mainly grade three and grade four wool)

1.4. Pure polyester fiber felt.

 

 

2. Product number

 

The product number consists of five digits, with the symbol "_" in between the three and four digits.

 

2.1. The first digit indicates the product color:

The first one	Raw material color
1	White
2	Grey
3	Natural Variegated
4	Color
5	Various colors

 

 

2.2. The second digit indicates the type of raw materials used.

Second	Raw material type
1	Fine Wool
2	Semi-Coarse Wool
3	Coarse Wool
4	Miscellaneous hair
5	Animal Hair
6	Polyester
7	Other

 

2.3. The third digit indicates the product variety and specifications:

Third	Variety specifications
1	Flat felt（Length ≥ 5m）
2	Felt block（Length ＜ 5m）
3	Felt wheel
4	Felt tube
5	Ring parts (oil seal)
6	Ring parts with joints
7	Block parts
8	Round parts
9	Bar parts
10	Filter element

 

 

2.4. The fourth and fifth digits indicate the unit volume mass density of the product (g/cm³)

 

 

2.5. T stands for special felt.

 

 

2.6. Examples

Example 1: T112-32-44, a special white fine felt block, density: 0.32g/cm³-0.44g/cm³

Example 2: 112-32-44, that is, white fine wool ordinary felt block, density: 0.32g/cm³-0.44g/cm³

Example 3: 124-25, that is, white semi-coarse felt cylinder, density: 0.25g/cm³