| ≥1 piece |
|
Items
|
Specification
|
|
Appearance
|
White to milky white crystalline powder
|
|
Content(%)
|
98-102%
|
|
Loss on drying(%)
|
≤0.5%
|
|
Gallic acid content(%)
|
≤1.0%
|
|
Residue on ignition(%)
|
≤ 0.1%
|
|
Melting point(℃)
|
146-150℃
|
|
Heavy metal(pb ppm)
|
≤ 10ppm
|
|
Lead(ppm)
|
<1ppm
|
|
Arsenic(ppm)
|
<3ppm
|
|
HG(ppm)
|
<1ppm
|