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4-Amino-5-hydroxynaphthalene-2,7-disulphonic acid
CAS 90-20-0
Purity 98%min
Packing 25kg/bag
1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid
| Name | 1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid |
| Synonyms | 4-Amino-5-hydroxynaphthalene-2,7-disulphonic acid |
| Molecular Structure |  |
| Molecular Formula | C10H9NO7S2 |
| Molecular Weight | 319.31 |
| CAS Registry Number | 90-20-0 |
| EC Number | 201-975-7 |
Specification:
Item | Specification |
Appearance | Gray to gray-brown powder. |
Content(on anhydrous basis) | ≥85.0% |
Purity(HPLC) | ≥98.0% |
Chromotr-opic acid | ≤1.0% |
Omega acid | ≤0.50% |
T-acid | ≤0.30% |
K-acid | ≤0.10% |
Total organic impurity | ≤2.0% |
Insoluble matter | ≤0.20% |
Uses:
Primarily employed as a coupling component in azo dye synthesis, H Acid is a versatile intermediate
that yields a broad range of acid, direct, and reactive dyes for the textile, leather, and paper sectors,
enabling superior color fastness and shade control.
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