Aluminum Polishing Roughness: Tough Reality for 0.3 nm

Summary for aluminum polishing roughness Discussion

Polishing aluminum deposited on glass to 0.3 nm is the central question, and the answer in the thread is essentially that this level of finish is not realistically achievable with ordinary polishing methods. ASHAMONI NEOG asks what polishing material and grit would be needed for aluminum on Bluestar microscopic slides, or whether the target is impossible. In response, Nadcap Chemical Processing Auditor says that while anything may be possible in theory, their understanding is that there is no technology for achieving such polishing on aluminum. They add that a quick search suggests even specialized techniques have only reached about 0.7 nm, which is still rougher than the requested target. The practical takeaway is that the requested surface roughness appears beyond standard or even highly specialized polishing capability, at least based on the answer given.