Can I make diffusion pumps from aluminum? I am going to create parallel connected diffusion pumps for many UHV purposes. I see that aluminum that is treated to prevent outgassing is used for UHV valves, chambers, and reactors. I'd like to know what temperature diffusion pumps boil their silicon oil at because I would love to make these pumps from aluminum. Diffusion pumps are superior in every way when it comes to low cost DIY. There are even DIY diffusion pumps made from stainless steel cups that are poorly designed (shooting vapor straightdown instead of onto cooled walls) on instructables.com that have achieved 0.022 millitorr. Because these can be combined in series or parallel, their strength does not matter.