997 Alumina Ceramics C799 Thermocouple Protection Tube Closed One End and Open Both End

Product Detail

997 Alumina Ceramics C799 Thermocouple Protection Tube Closed One End and Open Both End

Alumina ceramic-protection tubes are considered to have better mechanical strength and chemical resistance. With excellent gas tight, they can be primary as protection tubes for Noble Metal (Platinum based) thermocouples.

Chemical Composition and Physical Properties

	95 Series	99 Series	997 Series	Steatite	Zr2O Y-PSZ	Al2O2+Zr2O
Al2O3(%)	=95	=99	=99.7
SiO2(%)	=2.3	<0.2	<0.04		<0.2	<0.04
Fe2O3(%)	<0.1	<0.1	<0.05		<0.1	<0.05
Alkaline Substances(%)	<0.1	<0.1	<0.08		<0.1	<0.08
Density(g/cm³)	3.7	3.87	3.89	2.7	3.87	3.89
Hardness(Mohs)	8.8	9	9		9	9
Flexural strength(Mpa)	300	340	390	150	1000	600
Compressive strength(Mpa)	3400	3600	3900	900	3000	3600
Modulus of elasticity(Gpa)	350	380	390	120	205	350
Impact resistance(Mpa m1/2)	4.0	5.0	5.2		8	7.5
Webull modulus(m)	10	10	12		22	18
Vickers hardness(HV0.5)	1800	1900	2000		1300	1600
Thermal expansion coefficient(10-6k -1)	5.0-8.3	5.4-8.3	5.5-8.4	6.0-9.0	10	6.0-8.6
Thermal conductivity(W.mK)	24	27	28	2.0-2.5	<2	18
Thermal shock resistance(T?)	250	270	280	100	270	320
Volume resistivity at 20?(Ocm)	>1014	>1014	>1015	>1013	>1010	>1013
Dielectric strength(kv/mm)	20	25	30	20
Operating temperature in short time(?)	1650	1800	1850	1450
Operating temperature in long time(?)	1530	1650	1700	1250
color	pink,white	white,ivory	ivory	white