Osmium:
No, that's a common rating for oil pumps. Nothing outstanding really.Yeah sure, it is quite common that you can distill P2P for example (bp 214°C/760 torr) at below room temp, isn't it?
All oil pumps can do that, surely - very common...
Do you try to show off with your own amazing vac pump?
I at least know several models of several different manufacturers (Duerr, Heidolph, KNF to name a few) being "only" able to pull something like between 20.00 to 0.01 torr in theory - but 1*10
-3 torr with these smaller models was new to me, and even if it can't pull that much, it is still 10 times a stronger vacuum than I could theoretically achieve with my old pump...
edwards are still usually pretty expensive. Worth every cent thoughThe Edwards pump I'm talking of has a little valve for regulating the pumping speed, at the cost of less vacuum - and the specs say it should still be able to pull 0.05torr with this valve fully opened, i.e. with full gas ballast...
Oh, did I mention the pump was too used in a university until now? And the price is astonishing low...
THX for your replies anyway. Think I will buy it, as it isn't really expensive and should do good work...
Greetz A