| Characteristics | Specifications |
|---|---|
| Appearance | May be off-white to brown |
| Free SO3 percent by mass (%) | 23 min |
| Residue on Ignition (%) | 99.2 |
| Sulfuric Acids (as H2SO4) (%) | 0.2 |
| Iron (as Fe) (%) | 0.05 |
| Chloride (as Cl)(%) | 0.002 |
| Sulfur Trioxide, S02 (%) | 0.20 |
| Total nitrogen as (HNO3)(%) | 0.005 |
| Arsenic as As | 0.0005 |
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