99.8 high pure Alumina Ceramic tube (ISO9001)

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Alumina tubes are widely used in thermocouple protections and some are used infurnaces. We could design both open for two ends, and one open, the other closed.Also we could make with 2 or 4 holes in the tube. The size ranges from 3mm to 100mm for O.D., and the length is from 10mm to 3000mm. We can also design upon the customers' detailed requirements.

Selection of a variety of high-quality ceramic materials, hot, dry-pressed or injection molding, from high-temperature sintering of alumina ceramic tubes, alumina ceramic rods (which can be mechanical or electronic finishing, the tolerances up to +/- 0.01mm.), high hardness , insulation, wear-resistant, high temperature-resistant, hot and cold shock-resistant. Customers can request a special size and production. Alumina ceramic tube is mainly applied to wear, serious scour of material handling occasions, such as coal-fired power generation, metallurgy, coal, mining, industry, and other geological materials pipeline, as well as the use of electronic appliances such as insulation pipe; alumina ceramic rods is widely used in the industry of resistance to temperature and thermostat, as a resistance ceramic matrix and two-metal thermostat used in ceramic-top column.

  

 Funace tube 

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

 Main performance index

Items	performance index	Measuring Unit	High purity Alumina	99 Alumina	85 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 thermal expansion	mm.10-6/degree Celsius.m	8.6	8.2	8.2
10	Thermal conductivity	W/m.k	25	25	25
11	Electric insulation strength	KV/mm	20	20	15
12	20 degree Celsius direct current insulating resistance	Ohm/cm	1014	1014	1014
13	High-temperature insulation resistance	1000 degree Celsius MΩ	≥0.08	≥0.08	≥0.08
		1300 degree Celsius MΩ	≥0.02	≥0.02	≥0.02
14	Thermal shock resistance		1550 degree Celsius 6 times not cracked	1550 degree Celsius 6 times not cracked	1300 degree Celsius 3 times not cracked
15	Maximum service temperature	degree Celsius	1900	1800	1400

99.8 high pure Alumina Ceramic tube (ISO9001)