| CERAMIC SINTERED ALUMINA TUBES |
| AluSIK-99 ZA Type C 799 “TEH” |
|
FEATURES:
- High dimensional tolerance
- High heat resistance
- Very high wear resistance
- Chemical corrosion resistance
- Very good thermal conductivity
- High degree of reliability and economy in service
- Very high mechanical & refractory strength, very hard
|
 Thermocouple Protection Sheath |
|
DESCRIPTION:
AluSik –99 ZA
are sintered alumina tubes with excellent temperature stability. They are
popularly used as furnace tubes and protecting and insulating tubes for
high temperature thermocouple assemblies. Because of their high purity and fine grain structure, AluSik –
99 ZA possess high wear resistance high strength, high thermal conductivity and insulating properties.
The Al2O3 content of AluSik –99 ZA is more that 99% making it perfectly suitable
for use in Platinum/ Platinum Rhodium thermocouple as any presence of
silicate would contaminate these thermocouples and reduce their service
life.
AluSick 99 ZA
tubes are available in a variety of sizes with one end closed as
protection tubes or both ends open with 2-hole or 4-holes as insulating
tubes. |
 2-hole and 4-hole insulating tubes |
PROPERTIES:
Temperature
stability up to 1800°C
AluSik – 99 ZA tubes exhibit stability at temperature as
high as 1,800°C giving it advantage over metal or glass material.
Application temperature also is influenced by the tube geometry, the
diameter, the wall thickness and the method of installation i.e.,
horizontal or vertical.
High chemical resistance
AluSik – 99 ZA has excellent chemical resistivity
and are corrosion resistant against most acids and alkaline. Also, the
stability in neututral or reducing atmosphere is excellent.
High electrical insulation
Due to its very high electrical insulation properties, AluSik –99 ZA is ideal as thermocouple wire insulating tubes and thermocouple protection tubes even in electrically heated furnaces.
Mechanical wear resistance
Due to high mechanical wear resistance AluSik-99 ZA tubes
exhibitslong term stability even when subjected to abrasive environment.
Dimensional flexibility
Various standard sizes are available from 0.5 mm
through 300 mm in diameter. Tubes with non-standard sizes can be offered
in accordance with customer’s specifications and dimensions. |
|
SPECIFICATIONS
| QUALITY |
AluSIK-99 ZA |
| Chem./Phys. Composition |
Sintered alumina |
| Type according to DIN VDE 0335 |
C 799
|
| Chem. Composition Al2O3 |
99.7 %
|
| Structure |
dense
|
| Type of body |
Impervious |
| Bulk density |
3.8 g/cm3
|
| Open porosity |
0 % |
| Limit of application |
1750°C
|
Thermal expansion
20-1000°C
|
8 x 10-6K-1
|
Thermal conductivity 20-100°C
|
25 W/mK
|
Flexural strength
unglazed min.
|
300 N mm-2
|
Mean coefficient of
linear expansion 30~100°C
|
5~7 10-6 K-1
|
| Mean coefficient of
linear expansion 30~600°C
|
7~8 10-6 K-1
|
| Temp. for volume
resistivity 1 MW cm (min.)
|
800°C
|
Thermal shock resistance
|
medium-good |
Spec. electric
resistance at RT
|
1014 cm |
600°C
|
108
|
| Maximum
production length for tubes
|
3000
mm
|
Tolerance For Protection Tubes as per DIN 43723
| VDE 0335 Type |
Outer - f (d1) |
Inner - f(d2) |
Length(L±2) |
C 799 |
10 |
6 |
270, 375, 530, 740,1030, 1430, 2030
|
| 15 |
10 |
| 24 |
18 |
 |
|
|
SILICON
CARBIDE TUBES
| CarSik-70 ZA |
CarSik-90ZA |
 |
| Nitride bounded Silicon Carbide Porous,
(70% SiC, 24% Si3N4). Features high strength up to temperature of
1,450°C |
Dense, Silicon Carbide with good mechanical
properties, at high temperatures of up to 1,700°C |
|
DIMMENSIONS
(in mm)
| Thermocouple Protection Tubes |
Order No. |
OD X ID |
| R 208 |
8 x 5 |
| R 211 |
12 x 8 |
| R 212 |
15 x 10 |
| R 214 |
20 x 15 |
| R 215 |
24 x 18 |
| Multi-Bore
Insulating Tubes (Round) |
| Bore |
O.D. (mm) |
Bore Dia. (mm) |
| 2 |
4.8 |
1.4 |
| 4 |
3.0 |
0.8 |
| 4 |
3.5 |
1.0 |
| 4 |
5.5 |
1.2 |
| 4 |
8.5 |
1.5 |
| 6 |
4.9 |
0.75 |
| 7 |
4.9 |
1.8 |
| Two
Bore Insulating Tubes (Oval) |
| O.D. (mm) |
I.D. (mm) |
Bore Dia. (mm) |
| 2.5 |
1.5 |
0.7 |
| 4.2 |
2.1 |
0.85 |
| 4.3 |
1.4 |
0.7 |
| 4.5 |
3.1 |
1.7 |
| 2.95 |
2.0 |
0.6 |
|
|
