Fiber Cleanliness

In addition to usable fibers, cotton stock contains foreign matters of various kinds:

1. Vegetable matter:

i. Husk portions.

ii. Seed fragments.

iii. Stem fragments.

iv. Leaf fragments.

v. Wood fragments.

2. Mineral material:

i. Earth.

ii. Sand.

iii. Ore dust picked up in transport.

iv. Coal dust picked up in transport.

3. Other foreign matter:

i. Metal fragments.

ii. Cloth fragments.

iii. Packing materials (mostly polymers).

The scale below represents the degree of contamination:

Up to 1.2%	Very clean
1.2 to 2.0%	Clean
2.0 to 4.0%	Medium
4.0 to 7.0%	Dirty
7.0 and above	Very dirty