Technical ceramics

Ceramic supporting materials for electric elements and furnaces in a variety of forms. The Kanthal® program of technical ceramics include three different types of ceramics, all manufactured using raw materials of the highest quality and not containing conductive ingredients.

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Information

Aluminosilicates (Kanthal® code A42P)

Materials for temperatures up to 1100-1200°C (2010-2190°F) with good thermal shock resistance. Alumina content of less than 50%.

Aluminous (Kanthal® codes A60P, A50C, A73E, A80E)

Materials for up to about 1300°C (2370°F) with fairly good thermal shock resistance and excellent dielectric properties. Alumina content of more than 50%.

Cordierites (Kanthal® code A38E)

Materials with added magnesium oxide for up to about 1100°C (2010°F) with excellent mechanical and thermal shock resistance.

Health and safety

Kanthal® ceramic materials do not contain substances dangerous to health or create them during use. They are produced using inert natural raw materials, and any organic binders used are burned during firing.

During final processing such as cutting or drilling, inert dust may be created. In these cases, workers must be provided with suitable protective equipment to prevent inhalation.

Characteristics

The Kanthal® program of technical ceramics include three different types of ceramics, all manufactured using raw materials of the highest quality and not containing conductive ingredients.

Kanthal® types of technical ceramics:

  • Aluminosilicates (Kanthal code A42P)
  • Aluminous (Kanthal codes A60P, A50C, A73E, A80E)
  • Cordierites (Kanthal code A38E)
A42P A60P A50C A73/80E A38E
Max. operating temp. 1200°C (2190°F) 1300°C (2370°F) 1300°C (2370°F) 1300°C (2370°F) 1200°C (2190°F)
H2O absorption as % value 12-18 12-18 12-18 12-18 12-18
Bulk density, g/cm3 (lbs/in3) 1.9 (0.07) 2.2 (0.08) 2.0 (0.07) 2.2 (0.08) 1.9 (0.07)
Thermal conductivity, W/mK 20-1000°C (68-1830°F) 460-627 627-836 460-627 627-836 460-585
Cold compression strength, kg/cm2 (lbs/in2) 300 (4267) 400 (5689) 300 (4267) 400 (5689) 300 (4267)
Specific heat, kcal/kg/°C 100-1000°C (210-1830°F) 0.2 0.2 0.2 0.2 0.2
Thermal shock resistance Good Good Good Good Excellent
Thermal expansion coefficient x 10-6 6.5 6.5 6.5 6.5 6.5
Resistivity 10-100 MΩ cm 400°C (750°F)
1-10 MΩ cm 600°C (1110°F)
0.1-1 MΩ cm 800°C (1470°F)
10-100 kΩ cm 1000°C (1830°F)
Nominal content of chemical ingredients
A38E A73E A80E A42P A60P A50C
SiO2 53.2 21 12.4 47.2 30.5 37.8
Al2O3 38 73 82.2 43 60 53.5
Fe2O3 0.9 0.6 0.5 0.9 0.9 0.8
MgO 4 0.2 0.2 0.4 0.3 <0.1
TiO 0.5 0.4 0.4 0.4 0.7 0.3
CaO 0.2 <0.1 <0.1 0.4 0.3 <0.1
K2O 1.2 <0.1 <0.1 0.3 0.9 3.2
Na2O <0.1 <0.1 <0.1 0.2 0.1 0.1
LiO <0.1 <0.1 0.3 <0.1 <0.1 <0.1

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