Specifications

Alumina tube
1.Material:alumina ceramic
2.Used in various furnace
3.RoHs certificated
4.Speedy delivery

Alumina tube 

 

We mainly produce alumina tubes, rods and various industrial ceramic parts, which are mainly used in thermalcouple temperature, liquid steel continous temperature, various industrial furnace(containing vacuum furnace, carburizing furnace, wire furnace, atmosphere furnace etc), especially widely used in petrochemical, spinning, electric, instrumentation, mechanical workout, military project etc industry.

 

Main performance index
Serial number	performance index	Measuring unit	High purity alumina	High Alumina	alumina
1	Al2O3	%	99.7	99.3	85
2	SiO2	%	less than0.1	—	—
3	Density	g/cm3	3.95	3.88	3.2
4	Wter absorption	%	0	0.01	0.2
5	Cld compressive strength	MPa	450	350	200
6	20 degree Celsius leak rates	Torr/L.sec	less than10-11	less than10-11	less than10-11
7	Twisting in high temperature	mm	1700 degree Celsius 0.2 allowance	1600 degree Celsius 0.2  allowance	1400 degree Celsius 0.2 allowance
8	Bonding in high temperature		1700 degree  Celsius non-caked	1600 degree Celsius   non-caked	1400 degree Celsius non-caked
9	20—1000 degree Celsius coefficient of	mm.10-6/degree Celsius.m	8.6	8.2	8.2
	thermal expansion
10	Thermal conductivity	W/m.k	25	25	25
11	Electric insulation strength	KV/mm	20	20	15
12	20 degree Celsius direct current	Ohm/cm	1014	1014	1014
	insulating resistance
13	High-temperature	1000 degree Celsius MΩ	≥0.08	≥0.08	≥0.08
	insulation resistance	1300 degree Celsius MΩ	≥0.02	≥0.02	≥0.02
14	Thermal shock resistance		1550 degree  Celsius 6 times not racked	1550 degree Celsius 6  times not cracked	1300 degree Celsius 3 times not cracked
15	Maximum service temperature	degree Celsius	1900	1800