Fiber Density:
Fiber density is used as the measure of its fineness.
| Fiber | Density g/cm3 |
| Polypropylene | 0.90 |
| Polyethylene | 0.95 |
| Nylon 11 | 1.10 |
| Nylon 6 | 1.13 |
| Nylon 6,6 | 1.14 |
| Acrylic | 1.14-1.18 |
| Triacetate | 1.30 |
| Wool | 1.31 |
| Acetate | 1.33 |
| Silk | 1.33 |
| Cotton | 1.35 |
| Polyester | 1.38 |
| Viscose | 1.52 |