Chemical competent

Al2O3

≥99.5%

SiO2

<0.2%

Fe2O3

<0.1%

Alkaline matter

<0.1%

Density

3.9 g/cm3

Hardness

9 M

Water absorption

<0.1%

Ruptures trength

>2000kg/cm2

Gas tightness

Kept for ten minutes at negative pressure of 1.3Kpa.
The pressure drop is less than 0.3Kpa.

Thermal tolerance

Insert the pipe into the furnace at a depth of 20mm.
Heat to 1600ºC and maintain for 30 minutes.

Alkali tolerance

In the Na2CO3 solution of 2N concentration, boil for
15 hours with the weight loss not greater than 20mg/dm2.

Volume resistance

>9*10(5) Ω·cm/1600ºC

Breakdown voltage

20kv/cm

Expansion coefficient

8*10(-8)

Temperature for use

Long-term: 1600ºC Short-term: 1800ºC