Properties: white needle-like or powdery crystal
| Index name | Analytic pure (AR) |
Chemical pure (CP) |
Refined grade |
Special grade |
Industrial top-grade |
Industrial grade |
Appearance |
white needle-like or powdery crystal |
white needle-like or powdery crystal |
white needle-like or powdery crystal |
white needle-like or powdery crystal |
powdery crystal |
red crystal |
Assay %≥ |
99 |
98 |
98 |
97 |
95 |
93 |
Sulfate ( free acid SO4)≤ |
0.01 |
0.1 |
0.1 |
0.3 |
2.0 |
3.5 |
Melting point |
103℃~105℃ |
103℃~105℃ |
103℃~105℃ |
103℃~105℃ |
103℃~105℃ |
|
NaCl≤ |
0.01% |
|
|
|
|
|
Residue on ignition |
≤0.1% |
≤0.2% |
|
|
|
|
Dissolved test in water |
qualified |
qualified |
|
|
|
|
Dissolved test in alcohol |
qualified |
qualified |
|
|
|
|
Packing |
10kg/box (plastic lining) |
10kg/box (plastic lining) |
25kg/bag (double-layer) |
25kg/bag (double-layer) |
25kg/bag (double-layer) |
25kg/bag (double-layer) |
Special grade P-toluene sulfonic acid (PTS) ( for coating and ink) has excellent performance: :fast curing speed and the the color of paint film is not changed.