Name of index

Index

Actual index

Na2HPO₄                                         %

≥98.0

99.5

Substances not dissolved in water   %

≤0.50

0.02

Heavy metal (Pb)                             %

≤0.001

<0.001

Fluorides (F)                                    %

≤0.005

<0.005

As                                                     %

≤0.0003

<0.0002

Loss weight when dry                      %

≤5.0

3.3