white fused alumina

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white fused alumina
Posting date : Sep 10, 2008
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27-
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White Fused Alumina (Refractory grade) White Fused Alumina(WFA or WA)is made from chemical by Higgns furnace or Tilting furnace at high temperature.It is very important raw material for advanced refractories and abrasives.Its properties are as folowing. Type Lower sodium (I) Middle sodium (II) Properties Fraction(mesh) Fine(mesh) Fraction(mesh) Fine(mesh) 0-1 1-2 3-5m/m 0-180 0-320 0-1 1-2 3-5m/m 0-180 0-320 Guarantee Value Typical value Guarantee Value Typical value Guarantee Value Typical value Guarantee Value Typical value Chemical Composition (%) α-Al2O3 ≥99 99.3 ≥98.5 99.23 ≥99 99.14 ≥98.5 98.75 SiO2 ≤0.2 0.15 ≤0.3 0.22 ≤0.4 0.12 ≤0.4 0.19 Fe2O3 ≤0.2 0.04 ≤0.25 0.04 ≤0.2 0.01 ≤0.25 0.05 Na2O ≤0.15 0.12 ≤0.25 0.18 ≤0.4 0.35 ≤0.5 0.23 Principal crystalline phase α-Al2O3 Crystal system Hexzagon Colour white True density (g/cm3) ≥3.95 Packing density (g/cm3) 1.75-1.95 Mohs hardness 9 Linear expansion (1/°C) 8.3×10-4 Size(mm) 8-5 5-3 3-1 1-0 Fine(mesh) -80,-120,-240,-320 Micropowder(um) 3-5 5-10 Test standard GB/T3044-89 Packing 25kg/bag 1000kg/big bag Usage Refractories

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