Caprolactam: Characteristics
Why nylon fibre needs near-perfect purity
What this tab covers The physical and chemical properties that set its grade, price and uses, with the commercial grades and the standards that define them.Purity and colour matter because nylon 6 fibre needs very low impurity levels. Physical form (molten or flake) decides logistics.
Properties that matter commercially
| Property | Value / specification | Why it matters | Source |
|---|---|---|---|
| Purity | at least 99.9% (indicative) | Fibre spinning quality | indicative |
| Permanganate number and APHA colour | low (indicative) | Oxidisable impurities cause yellowing | indicative |
| Melting point | about 69 C | Molten logistics | standard data |
Commercial grades
- Fibre grade
- Engineering plastics grade
- Molten and flake forms