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Name of index

FCC-V

E281

APPEARANCE

White crystalline or crystalline powder

White crystalline hygroscopic powder, or a fine white powder

Content

99.0-100.5（drying basis）%

≥99.0% (105℃,2h)

pH (10 % aqueous solution)

--

7.5-10.5

As≤%

--

0.0003

Heavy metals ≤%

--

0.001

Alkalinity (as Na2CO3)

Passes test (about 0.15%)

--

Loss on drying ≤%

1

4(105℃,2h)

Water insoluble ≤%

--

0.1

Iron ≤%

0.003

0.005

Lead ≤%

0.0002

0.0005

Mercury ≤%

--

0.0001