Do you know if rubidium and caesium react with Viton gate valve sealing and degrade the vacuum or effectivity of the valve?

27 March 2023 1 2K Report

We are building a new vacuum setup and are curious about the performance of Viton sealing in a gate valve. Does it degrade the vacuum over time because of the reaction with rubidium and caesium or is the performance of the Viton sealing affected by the presence of rubidium and caesium? Does anybody have any experience with this?

Jürgen Weippert

I don't have practical experience, but I would expect that if you evaporate either of these metals on Viton, you will form RbF or CsF and thus the viton seal will start getting crumbly.

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