1.High strength alumina ceramic 2.High wear-resistance 3.High density 4.High hardness 5.Entire specification

High Purity Alumina Ceramic Tube are widely used in thermocouple protections and some are used in furnaces. 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.

 Features:

1.Extreme high temperature stability under reducing, inert and high vacuum condition under high   temperature up to 1800C.

2.Extreme wear and abrasion resistance.

3.Chemical corrosion resistance under high temperature.

4.High dielectric properties.

5.Gas tight for many applications to provide protective atmospheres or high vacuum at high temperature to eliminate contamination or impurity.

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.

 

Furnace 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

(Best Selling Product, High Quality Guarantee!!!)Alumina Tubes With Extreme High Temperature Stability And Corrosion Resistance