F.M.:  MgCO₃
Specs.:

MgO                                                       40% min.
Acid infusibility                                 0.15% max.
Moisture                                               3.0% max.
CaO                                                    0.70% max.
Vector of baking                                     54-58%
Fe                                                        0.05% max.
Sulfate                                                0.15% max.
Remain (150um)                           0.003% max.
Density:                                              0.14% max.

Packing:         25kgs net bag