Vacuum tubing material?

  • Tried to use nylon tubing in vacuum reactor, and there seems to be slow leak, and started to suspect that nylon might be problematic due to being hygroscopic, and thus leaking water vapor in low pressure environment. Is there some other plastic tube type that would work, since i like the flexibility of plastic compared to metal pipes. Or is nylon ok after initially giving off some vapor?

  • In cylindrical Li-ion batteries, the insulation of caps is made of nylon material. In these batteries, air-tightness and very low moisture content are crucial. Therefore, if nylon was problematic sealant, it would not be used in batteries.

  • My experience with vacuum is in fish oil processing but I recall we had all metal tubing, as we worked at temps where plastic were not possible. Whenever we needed some slight flexibility, copper tubing was used.

    Just to answer your question, plastic tubing in general is less than optimal for high vacuum applications, and within these, nylon is said to be particularly problematic for being hydrophilic.

    This comes from a vacuum tubing vendor.…o%20be%20low%20outgassing.

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