| Characteristics | Specifications |
|---|---|
| Appearance | The material shall be a transparent liquid |
| Free SO3 (%) | It shall be colourless or have a brownish tinge |
| Percent by mass (%) | 99.2 min. |
| Sulfuric Acids (as H2SO4) (%) | 0.40 |
| Iron (as Fe )(%) | 0.01 |
| Oxidation impurities (as S02)(%) | 0.20 |
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