|
TABLE FOR GUIDENCE TO THE
SELECTION OF A SUITABLE VACUUM PUMP FOR DEGASSING. (Rate of
Evacuation for Various Cylindrical Vacuum Chambers)
| Dimensions of
vacuum chamber (in mm) |
Gross volume of
vacuum chamber (in litres) |
Max holding
capacity of RTV silicone rubber based on X6 expansion (in grams) |
Speed of vacuum
pump required (in CMH) to reach a vacuum of 10 Millibar in time shown
below |
| Diameter &
height |
|
|
5
mins |
3
mins |
2
mins |
1
min |
30
sec |
|
175 x
175 |
4.2 |
600 |
1.0 |
1.0 |
1.0 |
2.0 |
3.0 |
|
230 x
230 |
9.6 |
1400 |
1.0 |
1.0 |
2.0 |
3.0 |
6.0 |
|
305 x
150 |
11.0 |
1600 |
1.0 |
1.5 |
2.0 |
4.0 |
7.0 |
|
305 x
230 |
16.0 |
2300 |
1.0 |
2.0 |
3.0 |
5.0 |
10.0 |
|
305 x
305 |
21.0 |
3000 |
2.0 |
3.0 |
4.0 |
6.0 |
13.0 |
|
305 x
460 |
32.0 |
4700 |
2.0 |
4.0 |
6.0 |
10.0 |
20.0 |
|
380 x
330 |
37.0 |
5400 |
3.0 |
4.0 |
6.0 |
11.0 |
22.0 |
|
460 x
150 |
34.0 |
3500 |
2.0 |
3.0 |
4.0 |
7.0 |
13.0 |
|
460 x
230 |
37.0 |
5400 |
3.0 |
4.0 |
6.0 |
11.0 |
22.0 |
|
460 x
305 |
48.0 |
7000 |
3.0 |
4.0 |
9.0 |
15.0 |
30.0 |
|
460 x
460 |
72.0 |
10500 |
6.0 |
9.0 |
12.0 |
22.0 |
44.0 |
|
460 x
610 |
95.0 |
14000 |
6.0 |
10.0 |
15.0 |
30.0 |
65.0 |
|
500 x
500 |
100.0 |
14600 |
6.0 |
10.0 |
15.0 |
33.0 |
65.0 |
|
500 x
760 |
152.0 |
22000 |
9.0 |
15.0 |
23.0 |
44.0 |
90.0 |
|
610 x
460 |
127.0 |
18600 |
8.0 |
12.0 |
20.0 |
40.0 |
74.0 |
|
760 x
305 |
136.0 |
19000 |
8.0 |
14.0 |
22.0 |
45.0 |
88.0 |
All dimensions and rates
are approximate
Recommend maximum pump
down times: RTV Silicone rubber and most resins: 3 minutes. Casting and
Investing Plasters: 1 minute. Polyurethane: 30 seconds. Please refer to material
manufacturers specifications, which should give the pot life of the material
|
