p-Toluenesulfonic acid,CAS:104-15-4
| Item/Index | Industrial grade | Pharmaceutical grade | Refining grade | Reagent grade （chemical pure） |
| Content(C7H8O3S·H2O) ≥% | 93.0 | 95.0 | 97.0 | 98.0 |
| Free acid(H2SO4) ≤% | 3.0 | 2.0 | 0.5 | 0.03 |
| Moisture(crystal water)≤% | 14 | 14 | 14 | |
| Iron(Fe++) ≤ppm | 30 | 20 | ||
| Ignition residue ≤% | / | 0.2 | 0.2 | 0.02 |
| Melting point(°C) | / | / | 105-107 | 105-107 |
| Alcohol solution test | / | qualified | qualified | qualified |
| Water solution test | / | qualified | qualified | qualified |
