Glazed porcelain vacuum container?

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Daniel Knapp
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Joined: Sun Dec 31, 2017 6:35 am
Real name: Daniel Knapp

Glazed porcelain vacuum container?

Post by Daniel Knapp » Sun Dec 31, 2017 12:21 pm

Does anybody have any experience with making a vacuum container using glazed porcelain? Is it airtight?
I realize that unglazed porcelain lets hydrogen through, but the glazing could possibly prevent that.
Does the glazed surface of porcelain outgas?

Dan Knapp
Posts: 205
Joined: Wed Aug 06, 2008 12:34 pm
Real name: Dan Knapp

Re: Glazed porcelain vacuum container?

Post by Dan Knapp » Sun Dec 31, 2017 12:38 pm

It would depend upon the quality of the glazing. Glazed porcelain is used extensively on vacuum feedthroughs. A glazed porcelain container not made specifically for vacuum use would have a high probability of having pinhole defects, but if you were willing to invest the effort to find the defects, you could plug them with TorrSeal or equivalent product.

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