| Chemical Name | 2-Amino-1,5 Naphthalene Disulphonic Acid |
| CAS Number | 117-62-4 |
| Molecular Weight | 303 |
| Molecular Formula | C10 H9NO6S2 |
| Aspect | Buff white to moist solid |
| Purity (nitrite value) | 75% minimum |
| Tobias Acid | Nil (chromatography) |
| Metals (atomic absorption) | (see below) |
| Iron | less than 50 ppm |
| Calcium | less than 50 ppm |
| Copper | less than 50 ppm |
| Insolubles | less than 1% (see below) |
| Electronic grade STA: less than 50 ppm metals and zero percent insolubles | |
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