REFSAN MANGANESE OXIDE (R60214)

MANGANESE DIOXIDE

Manganese(IV) oxide is the inorganic compound with the formula MnO₂. This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules.

Above 1080C, half of the oxygen disassociates to produce MnO, a flux that immediately reacts with silica to produce violet colors in the absence of alumina, browns in its presence. Thus if it is being used in glazes fired below 1080C it should be considered as MnO2, if above it should be taken as 81.5 MnO and 18.5 LOI.

In glazes it will behave in a refractory manner, stiffening the melt. Because to the expulsion of oxygen at 1080, glazes using manganese should avoid this temperature range to reduce the chance of blistering and ruining of the glaze surface.

This material is available as a pure material or as a ground ore (pyrolusite). Thus while generically it is pure MnO2 the actual name-brand materials may only be 75% MnO2.

CERTIFICATE OF ANALYSIS

MANGANESE  DIOXIDE

SPECIFICATION                   

FORMULA                                          : MnO₂

APPEARANCE MnO₂                        : BROWN POWDER

MnO2                                                  : 60 % MIN.

Al2O3                                                  : 1,8 % MAX.

SiO2                                                    : 15 % MAX.

PARTICLE SIZE                                  : 44 - 75 MICRON