Chemical competent | Al2O3 | ≥85% |
SiO2 | <12% | |
Fe2O3 | <0.5% | |
Alkaline matter | <2.5% | |
Density | 2.6 g/cm3 | |
Hardness | 7 M | |
Water absorption | <0.2% | |
Rupture strength | >1300kg/cm2 | |
Gas tightness | Kept for ten minutes at negative pressure of 1.3Kpa. The pressure drop is less than 0.3Kpa. | |
Heat 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 | >2*10(5) Ω·cm/1300ºC | |
Breakdown voltage | 18kv/cm | |
Expansion coefficient | 5*10(-8) | |
Temperature for use | Long-term: 1400ºC Short-term: 1600ºC | |
Chill and abrupt heat | 1300ºC~room temperature not cracking thrice. | |
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