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Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
So I'm still working on that project that is running in a space-like environment. I need to know what type of plastic would be best for building the body of my thruster out of. I know that VESPEL would be ideal but I don't want to spend that much money if I don't have to. The only criteria is that it needs to be low out gassing and have fairly good durability. Ease of machining and cost are also big factors. What is the name of just generic plastic that is used for structural parts?
I'm also considering using ceramics. What is the cost comparison to have custom parts made? Would alumina be the most common type?
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
About the only plastics I have seen in UHV systems are PEEK, PTFE and polyimide, the rest outgas too much. I think PEEK is probably the best bet for anything requiring mechanical strength.
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
How is PEEK for cost? Most of my parts will be pretty simple. Largest is a .75" in thick ring, OD of 12" and a 1" height. How much to you think that would put me back ballpark?
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
I don't know because I only order parts made from it as spares for equipment (and scientific equipment has a nasty mark-up). I know it's not cheap. I think you would need to cut that ring from something like this and that's $910. What's wrong with steel or aluminium?
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
It has to be magnetically neutral and ellectrically non-conductive. The parts will briefly be in close proximity with plasma so they have to be able to handle that heat and the corrosiveness.
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Properties of different plastics
