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%

Rupture  strength

>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 1600C 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/1600C

Breakdown voltage

20kv/cm

Expansion coefficient

8*10(-8)

Temperature for use

Long-term: 1600C  Short-term: 1800C

Chill and abrupt heat

1500C~room temperature not cracking thrice.

OD

25~30

31~40

41~50

51~60

61~70

71~80

81~90

91~100

ID

19~23

24~32

33~40

41~50

51~60

61~70

71~80

81~90

L

200~1600