| ITEM | STANDARD | ||
| A | B | C | |
| Benzotriazole (as C 6 H 3 N 3 ) % min | 1.0 | 3.0 | |
| Total phosphate ( as PO 4 3 -) % min | 6.8 | 6.8 | 6.8 |
| Sub phosphoric acid ( PO 3 3- ) % max | 2.25 | 2.25 | 2.25 |
| Solid content % min | 32 | 32 | 32 |
| PH value ( 1% solution ) | 3.0±1.5 | 3.0±1.5 | 3.0±1.5 |
| Density 20 ºC ( g/cm3 ) | 1.10-1.18 | 1.10-1.1 8 | 1.10-1.18 |