Product Details

Specifications

1. High purity alumina
2. Low tolerance3.
3.8g/m3 high density
4. 1800 high temp

Hot sale 99 alumina ceramic tube

Properties for Alumina Ceramic Tubes

1. Hard, wear and abrasion resistance;

2. Good smooth and high strength and stiffness;

3. Resists strong acid and alkali attack at elevated temperatures;

4. Extreme high temperature stability;

5. Good thermal conductivity;

6. Excellent dielectric properties from DC to GHz frequencies

7. Good airproof capability;

8. Superior gas and vacuum tightness

Technical Data for Alumina Ceramic Tubes

Serial number	performance index	Measuring unit	High purity alumina	Alumina	High alumina
1	Al2O3	%	99.7	99.3	85
2	SiO2	%	less than0.1	—	—
3	Density	g/cm3	3.95	3.88	3.2
4	Water absorption	%	0	0.01	0.2
5	Cld compressive strength	MPa	450	350	200
6	20 °C leak rates	Torr/L.sec	less than10-11	less than10-11	less than10-11
7	Twisting in high temperature	mm	1700 °C 0.2 allowance	1600 °C 0.2 allowance	1400 °C 0.2 allowance
9	20—1000°C 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 °C direct current insulating resistance	Ohm/cm	1014	1014	1014
13	High-temperature insulation resistance	1000 °C MΩ	≥0.08	≥0.08	≥0.08
14	Thermal shock resistance	1300°C MΩ	≥0.02	≥0.02	≥0.02
14	Thermal shock resistance		1550°C 6 times not cracked	1550°C 6 times not cracked	1300°C 3 times not cracked
15	Maximum service temperature	degree Celsius	1900	1800