Electrofusion crystallized magnesia powder

Which features good electric insulation, fire resisting quality and thermal conductivity and has been widely used for stuffing material for different kinds of tubular electrical heating elements. Electrofusion crystallized magnesium oxide produced by our plant are all pulverization processed with high quality magnesium oxide lumps with magnesium content between 96% and 98%. Modified magnesium oxide is made with extra care by employing high quality modifiers from both home and abroad, with temperature endurance between 700¡æ and 800¡æ, non-carbonized, with moisture protection performance added and hot insulation resistance improved. Refer to the following for its chemical composition:
component      %
Name
Grade
burn decrease
SiO2
Fe2O3
Al2O3
CaO
MgO
Fused magnesite
crystal white lump
0.10-0.16
<0.80
16-0.20
<0.20
<1.20
98.00
Fused magnesite
common white lump
0.15-0.20
<1.00
0.20-0.30
<0.30
<1.50
97.00
Macrocrystalline fused magnesite
common white lump
0.15-0.20
<0.80
0.20-0.30
<0.20
<1.50
97.00
Macrocrystalline fused magnesite
common white lump
0.15-0.20
<1.00
0.20-0.30
<0.30
<1.50
96.00
Spec(number)
Remark
40-60
60-80
80-100
100-120
120-150
150-200
 
Optional
50-60
60-80
80-100
100-120
120-150
150-200
  
Optional
60-80
80-100
100-120
120-150
150-200
 
  
Optional
40-200
 
 
40-320
    
  
 
Optional
 
50-200
 
 
50-320
 
 
Optional
 
 
60-200
    
  
60-320
  
Optional

Proportion
Tap density
Compacted density
Fused magnesite lump
crystal white
3.65g/cm³
2.3g/cm³
3.10g/cm³
Fused magnesite lump
common white
3.50g/cm³
2.0g/cm³
3.00g/cm³
Macrocrystalline fused magnesite
crystal white
3.50g/cm³
2.3g/cm³
3.10g/cm³
Macrocrystalline fused magnesite
common white
3.50g/cm³
2.0g/cm³
3.00g/cm³

 

1. Physical and chemical indexes of the said common magnesia powder are all sense data at the time of purchasing raw materials by our plant. Mesh blending ratio for fine materials and particles can be selected according to diameter of metallic sleeve used by the user.
2. Modified magnesia powder
a) Hot insulation resistance: 1000m
b) Cold withstand voltage: 3000V and no break down for one minute.
c) Hot insulation resistance at 600¡æ: 100m
d) Leakage current under operating temperature: 0.05mA
e) Medium service temperature: 800

The said parameters for modified magnesia powder are only for the user¡¯s reference and specific data shall subject to actual measurement by the user.

 

    
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