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By certification 
Molecular formula: (CH3)2SO4
Physicochemical property: colorless oiliness flammable liquid, boiling point:188℃(disassimble) freezing:-26.8℃,specific gravity(20/4℃)1.3322. refractive index:(20/D)1.3874, flash point:182℉(closed cup tster). dissolve in aether and acetone .belong to aromatic hydrocarbon, slightly soluble in carbon bisulfide and aliphatic hydrocarbon.
Product quality: DB\3703 G17053-88
| Indicator name | Indicator |
| Appearance | Colorless and oiliness liquid |
| Content %≥ | 98.0 |
| Acidity%≤ | 0.8 |
