Magnesium Oxide – MgO


Our electrically Fused Magnesium Oxide extruded cores and dry pressed bushings and spacers have good electrical insulating properties with the added benefit, offering good thermal conducting properties at elevated temperatures.  Typical applications include, but not limited to, cartridge heaters, thermocouples, mineral insulated cable, high watt density heaters as well as other temperature sensing devices.

Material Specifications
Material                  Magnesia
Body Number S-464 S-461
 
Chemical Analysis
MgO, % 96.0 min 99.4 min      
AL2O3, % .40 max .15 max      
SiO2, % 2.6 max .15 max      
CaO, % 1.5 max .35 max      
Fe2O3, % .2 max .15 max      
B+Cd, ppm 400 max 30 max      
 
Mechanical Properties
Porosity, % MIN 12 MIN 14      
Bulk Density, gm/cc 2.33 2.38      
Flexural Strength, psi 2,000-10,000 2,000-10,000      
Compressive Strength, psi 5,000-15,000 2,000-15,000      
 
Thermal Properties
Thermal Expansion 25°-700°
inch/inch/°Cx10-6
12.4 12.7      
     
Note: This information is for design guidance only.  Du-Co will not guarantee this information as absolute values.  Various geometries can affect properties    

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