1. Appearance:white powder

2. Assay:≥99.5%

3. Arsenic:≤3ppm

4. Heavy metals:≤10ppm

5. Sulfated ash:≤0.1%

6. Moisture:≤0.5%

7. Sulfate:≤0.01%

8. Maleic acid:≤0.1%

9. Melting point:≤286-302°C

Fumaric acid