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TUBE PROCESSING QUICK
REFERENCE CHART |
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FOR AVERAGE SIZE UNITS |
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(15mm, ~8 feet long) |
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BOMBARDING |
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GLASS TEMPERATURE |
PRESSURE |
CURRENT |
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UP TO 150°C |
2 – 4 mm |
200 mA |
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150 - 200°C |
2 – 4 mm |
300 mA |
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200 - 250°C |
2 – 4 mm |
400 mA |
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250 - 300°C |
1 1/2 – 2 mm |
800 mA
or maximum
allowed for
electrodes used (10-15 x rating) |
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PUMPING |
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GLASS COOL DOWN |
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VACUUM OBTAINED |
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TEMPERATURE |
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IN MICRONS |
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GOOD
BETTER |
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200°C |
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- - -
< 10 |
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175°C |
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< 10
< 5 |
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150°C |
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<
5
< 1 |
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75°C |
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<
1
< 0.1 |
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RECOMMENDED FILLING PRESSURES
(AT 70-80°C GLASS TEMPERATURE) |
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TUBE DIAMETER |
PRESSURE (Torr/mm Hg.)
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8 mm |
........................... |
17 mm |
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9
mm |
........................... |
15 mm |
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10 mm |
........................... |
13 mm |
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11 mm |
........................... |
12 mm |
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12 mm |
........................... |
11 mm |
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13 mm |
........................... |
10 mm |
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15 mm |
........................... |
9 mm |
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18 mm |
........................... |
8 mm |
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20 mm |
........................... |
7.5 mm |
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22 mm |
........................... |
7
mm |
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25 mm |
........................... |
6 mm |
HP, 4 mm LP |
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