Specification:
|
Item
|
Index
|
|
Appearance
|
White crystalline powder
|
|
Assay (C4H6O6)
|
99.5-101.0%
|
|
Specific rotation
|
+12.0-12.8
|
|
Heavy metals (as Pb)
|
≤10 ppm
|
|
Chloride (CL)
|
≤100 pm
|
|
Arsenic
|
≤2 ppm
|
|
Sulfate (SO4)
|
≤150 ppm
|
|
Loss on drying
|
≤0.5%
|
|
Sulfate ash
|
≤0.1%
|
|
Oxalate
|
≤110 ppm
|
|
Calcium
|
≤200 ppm
|
Usage: used as pharmaceutical intermediate and preservatives in industry, and also used in manufacturing unsaturated polyester resin.