White or pale yellow crystalline powder, no obvious toxicity; slightly soluble in cold water, soluble in hot water, alkali solution; an important azo dye intermediate, used in the synthesis of direct dyes, acid dyes, reactive dyes, suitable for dyeing cotton, wool, silk and other fibers. Hazard Class: General chemicals; skin irritation
Chinese alias：2-氨基-5-萘酚-7-磺酸 （J酸）
English alias：2-Amino-5-naphthol-7-sulfonic acid；J-acid
Core intermediate for azo dyes; used in the synthesis of direct dyes (such as direct fast dyes), acid dyes, reactive dyes, suitable for dyeing cotton, wool, silk and other fibers, especially suitable for the preparation of bright color dyes, ensure color shade stability
| No. | Item | Superior Grade | First Grade |
| 1 | Appearance | Light gray to light brown powder | Same as superior grade |
| 2 | J-acid mass fraction / % | ≥ 92.00 | ≥ 90.00 |
| 3 | J-acid purity / % | ≥ 96.00 | ≥ 95.00 |
| 4 | Gamma acid content / % | ≤ 1.00 | ≤ 1.00 |
| 5 | Di-J-acid content / % | ≤ 0.20 | ≤ 0.20 |
| 6 | Water content / % | ≤ 1.00 | ≤ 1.00 |
| 7 | Alkali insoluble matter / % | ≤ 0.10 | ≤ 0.10 |
Address: Block B, Interstellar Center, Yuhua District, Shijiazhuang City, Hebei Province
