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Alumina Tubes
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Metric 99.5% Alumina Tube |
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Catalog # |
Outside Dia |
Inside Dia. |
| STTM-10 | 10mm | 6mm |
| STTM-15 | 15mm | 9mm |
| STTM-20 | 20mm | 16mm |
| STTM-25 | 25mm | 20mm |
| STTM-30 | 30mm | 25mm |
| STTM-40 | 40mm | 34mm |
| STTM-50 | 50mm | 44mm |
| STTM-60 | 60mm | 53mm |
| STTM-70 | 70mm | 63mm |
| STTM-80 | 80mm | 72mm |
| STTM-90 | 90mm | 81mm |
| STTM-100 | 100mm | 90mm |
| STTM-110 | 110mm | 100mm |
SentroTech Offers 99.5% and 99.8% High Purity Alumina Tubes. Both Metric and American sizes are available. These alumina tubes offer:
- Extreme high temperature stability under reducing, inert and high vacuum condition under high temperature up to 1800C.
- Extreme wear and abrasion resistance.
- Chemical corrosion resistance under high temperature.
- High dielectric properties.
- Gas tight for many applications to provide protective atmospheres or high vacuum at high temperature to eliminate contamination or impurity.
- Low material cost and custom size available.
- Available Tube Diameter From 3/16" to 9" for American size and 2 mm to 150 mm.
- Available Tube Length: From 1" ( 25mm) To 72" ( 1828mm).
- Most items are in Stock and can be delivered in 1-3 days.
- SentroTech also offer volume discount for all listed sizes if order quantity is more than 5 pieces for same size.
- Please Specify the Tube ID, OD and Length In the Quote Request Form
| American Unit 99.5% and 99.8% Alumina Tube |
| Sentro Tech Catalog # |
Outside Dia. |
Inside Dia. |
| in. |
mm |
in. |
mm |
| STT-0187 |
1/4 |
6.35 |
0.187 |
4.75 |
| STT-0196 |
0.276 |
7.00 |
0.196 |
5.00 |
| STT-0250 |
3/8 |
9.53 |
0.250 |
6.35 |
| STT-0316 |
7/16 |
11.13 |
0.316 |
7.94 |
| STT-0375 |
1/2 |
12.70 |
0.375 |
9.53 |
| STT-0437 |
11/16 |
17.46 |
0.437 |
11.11 |
| STT-0500 |
3/4 |
19.05 |
0.500 |
12.70 |
| STT-0563 |
3/4 |
19.05 |
0.563 |
14.29 |
| STT-0625 |
7/8 |
22.23 |
0.625 |
15.87 |
| STT-0750 |
1 |
25.4 0 |
0.750 |
19.05 |
| STT-0875 |
1 1/8 |
28.58 |
0.875 |
22.23 |
| STT-1000 |
1 1/4 |
31.75 |
1 |
25.40 |
| STT-1125 |
1 3/8 |
34.92 |
1 1/8 |
28.57 |
| STT-1250 |
1 1/2 |
38.10 |
1 1/4 |
31.75 |
| STT-1375 |
1 5/8 |
41.27 |
1 3/8 |
34.93 |
| STT-1500 |
1 3/4 |
44.45 |
1 1/2 |
38.10 |
| STT-1625 |
1 7/8 |
47.63 |
1 5/8 |
41.27 |
| STT-1750 |
2 |
50.80 |
1 3/4 |
44.45 |
| STT-1875 |
2 1/8 |
53.96 |
1 7/8 |
47.63 |
| STT-2000 |
2 1/4 |
57.15 |
2 |
50.80 |
| STT-2125 |
2 3/8 |
60.33 |
2 1/8 |
53.97 |
| STT-2250 |
2 1/2 |
63.50 |
2 1/4 |
57.15 |
| STT-2500 |
2 3/4 |
69.85 |
2 1/2 |
63.50 |
| STT-2750 |
3 |
76.20 |
2 3/4 |
69.85 |
| STT-2875 |
3 1/4 |
82.55 |
2 7/8 |
73.03 |
| STT-3000 |
3 1/4 |
82.55 |
3 |
76.20 |
| STT-3125 |
3 1/2 |
88.90 |
3 1/8 |
79.37 |
| STT-3250 |
3 1/2 |
88.90 |
3 1/4 |
82.55 |
| STT-3375 |
3 3/4 |
95.25 |
3 3/8 |
85.70 |
| STT-3500 |
3 3/4 |
95.25 |
3 1/2 |
88.90 |
| STT-3625 |
4 |
101.60 |
3 5/8 |
92.07 |
| STT-3875 |
4 1/4 |
107.95 |
3 7/8 |
98.42 |
| STT--4125 |
4 1/2 |
114.30 |
4 1/8 |
104.77 |
| STT-4375 |
4 3/4 |
120.65 |
4 3/8 |
111.12 |
| STT-4625 |
5 |
127.00 |
4 5/8 |
117.47 |
| STT-4875 |
5 1/4 |
133.35 |
4 7/8 |
123.82 |
| STT-5000 |
5 1/2 |
139.70 |
5 |
127.00 |
| STT-5500 |
6 |
152.40 |
5 1/2 |
139.70 |
| STT-6000 |
6 1/2 |
165.10 |
6 |
152.40 |
| STT-6250 |
6 3/4 |
171.45 |
6 1/4 |
158.75 |
| STT-6500 |
7 |
177.80 |
6 1/2 |
165.10 |
| STT-7000 |
7 1/2 |
190.50 |
7 |
177.80 |
| STT-8000 |
8 1/2 |
215.90 |
8 |
203.20 |
| STT-9000 |
9 1/2 |
241.30 |
9 |
228.60 |
Typical demensional tolerances: +/- 5% for Diameter and +/- 1.2% for the length
Max tube ID: 9", max tube length up to 72", please contact our sales office for Detail
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TYPICAL PHYSICAL PROPERTIES |
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MATERIAL |
ALUMINA |
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Composition |
99.80% AL2O3 |
99.5% AL2O3 |
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Bulk
Specific Gravity (g/cc) |
3.9 |
3.8 |
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Color |
Ivory |
Ivory |
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Impenetrability |
Gas Tight |
Gas Tight |
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Dye
Penetration A.S.T.M. |
Tight |
Tight |
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Flexural Strength (psi) |
70,000 |
50,000 |
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Compressive Strength (psi) |
370,000 |
350,000 |
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Tensile Strength (psi) |
43,000 |
33,000 |
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Maximum Working Temperature |
1800 °C |
1750 °C |
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Likely Sag Temp. Unsupported Tube* |
1600 °C |
1600 °C |
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Thermal Conductivity 24°C |
230 |
200 |
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(BTU-in/ft²-hr-°F) 800°C |
60 |
50 |
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Dielectric Strength 24°C V/Mil |
300 |
270 |
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Thermal Expansion (per °C x 10-6) |
8 |
8.4 |
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(24°C-1000 °C) |
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Hardness (Moh’s scale) |
9 |
9 |
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*Temperature at which an empty tube, 1 1/4" diameter,
suspended across an 18" span, will sag 1/4" in 1 hour. |
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Where sag is not acceptable, tubes must be adequately
supported along the full length. |
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