[time-nuts] Swagelok and metric tubing question

[Poul-Henning Kamp]

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In message <gk5f2clsh4uld71ta8fq1u3pirrns2o81k at 4ax.com>, Gary Woods writes:
>On Sat, 12 Nov 2016 13:05:56 -0800, you wrote:
>
>>Does it leak through cracks or migrate through metal?
>
>I was kinda wondering about that.  Isn't H the escape artist of the
>periodic table?

Indeed.

In particular it seeps through almost all metals.

(See also: https://en.wikipedia.org/wiki/Hydrogen_embrittlement)

The canonical filter method for hydrogen is to press it through a
"filter" which is a of solid slab of Palladium.

Helium is almost as bad, but is better in leak-checks because it
is non-reactive.

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