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Physic analysis

Brightness after burn%:      ≥ 77              Residue (+325 mesh)%:        ≤ 0.10

Moisture %:                       ≤ 28              pH:                                       3-5

Particle size (-2µm)%:        ≥ 50              Loss on ignigion %:               10-12  

Contraction%:                    < 10   

Chemical analysis  %

SiO₂:               ≤ 54                                        CaO:               ≤ 0.3

Al₂O₃:             ≥ 30                                         MgO:              ≤ 0.2

Fe₂O₃:            ≤ 1.3                                        K₂O:               ≤ 0.7

TiO₂:               ≤ 1.4                                        Na₂O:             ≤ 0.2