Cr2o3                    48 – 50%

Basic                      48%        (Scale fraction pro rata)

SiO2                       6%                          Max

Al2o3                    15%                        Max

MgO                      14%                        Max

Phos                      0.007%  Max

Sulphur                0.03%                    Max

Cr : Fe Ratio         2.6 : 1

Cr2o3                    50 – 52%

Basic                      50%        (Scale fraction pro rata)

SiO2                       5%                          Max

Al2o3                    15%                        Max

MgO                      14%                        Max

Phos                      0.007%  Max

Sulphur                0.03%                    Max

Cr : Fe Ratio         2.6 : 1

Cr2o3                    52 – 54%

Basic                      52%        (Scale fraction pro rata)

SiO2                       3%                          Max

Cr : Fe Ratio         2.8 : 1

Cr2o3                    54 – 56%

Basic                      54%        (Scale fraction pro rata)

SiO2                       2.5%                       Max

Cr : Fe Ratio         3.0 : 1

Cr2o3                    56 – 58%

Basic                      56%        (Scale fraction pro rata)

SiO2                       1.5%                       Max

Cr : Fe Ratio         3.2 : 1