Technical ceramics for electric elements and furnaces

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.

Good mechanical strength
High electrical resistance
Good thermal shock resistance

Information

Aluminosilicates (Kanthal^® code A42P)

Materials for temperatures up to 1,100-1,200°C (2,010-2,190°F) with good thermal shock resistance. Alumina content of less than 50%.

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

Materials for up to about 1,300°C (2,370°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 1,100°C (2,010°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.	1,200°C (2,190°F)	1,300°C (2,370°F)	1,300°C (2,370°F)	1,300°C (2,370°F)	1,200°C (2,190°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 20-1,000°C (68-1,830°F)	460-627	627-836	460-627	627-836	460-585
Cold compression strength, kg/cm² (lbs/in²)	300 (4,267)	400 (5,689)	300 (4,267)	400 (5,689)	300 (4,267)
Specific heat, kcal/kg/°C 100-1,000°C (210-1,830°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 (1,110°F)
		0.1-1	MΩ cm	800°C (1,470°F)
		10-100	kΩ cm	1,000°C (1,830°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