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FE-Content: > 64.50 % AI2O3: < 1,00 % (max 1,5 % Rog.) SIO2: 2,50 % max PHOS: 0.07 % max Sulphur: 0,06 % max Mn Mangan: 1,00 % max (ThK max.0,5%) MgO + CaO: 2,00 % max K2O + Na2O: 0,10 max. Bulk.