Crushable Ceramic Products


Du-Co Ceramics Company manufactures a variety of crushable ceramic materials for use worldwide in cartridge heaters, thermocouples, and mineral insulated cable. Our crushable ceramic products are custom designed to meet specifications for purity and crushability.

A wide variety of processing methods provide a level of control and consistency unmatched in the industry, making Du-Co Ceramics a preferred source for these high-quality crushable ceramic products.

Material Specifications
Material Magnesia Alumina Aluminum
Silicate
Silica
Body Number S-464 S-461 S-699 S-470 S-570
 
Chemical Analysis
MgO, % 96.0 min 99.4 min 1.78 36.27
AL2O3, % .40 max .15 max 99.65 min 26.70 10.20
SiO2, % 2.6 max .15 max .08 max 69.80 52.49
CaO, % 1.5 max .35 max .08 max .07 .31
Fe2O3, % .2 max .15 max .10 max .35 .44
B+Cd, ppm 400 max 30 max 30 max 400 400
 
Mechanical Properties
Porosity, % MIN 12 MIN 14 MIN 17 MIN 18 MIN 18
Bulk Density, gm/cc 2.33 2.38 2.20 1.78 2.0
Flexural Strength, psi 2,000-10,000 2,000-10,000 5,000-25,000 2,000-10,000 2,000-6,000
Compressive Strength, psi 5,000-15,000 2,000-15,000 7,000-30,000 7,000-30,000 2,000-6,000
 
Thermal Properties
Thermal Expansion 25°-700°
inch/inch/°Cx10-6
12.4 12.7 7.8 7.5 9.8
Max Operating Temp., °C 2,000°+ 2,000°+ 1,800° 1,400° 1,400°

Note: Values given are typical results from testing and should be used for reference only.


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