ITEM

standard

 purity ,%                                                                                ≥

90.0

whiteness ,                                                                             ≥

88.2

moisture, %                                                                            ≤

1.0

Fe , %                                                                                     ≤

0.1

Mg and alkali metals, %                                                          ≤

1.0

insoluble matter in Hcl , %                                                      ≤

1.0

Residue through 325 mesh , %                                              ≤

1.0