[time-nuts] temperature stability basics

[William H. Fite]

How about surplus HRSI tiles off the Shuttle?



On Sat, Nov 27, 2010 at 1:47 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>wrote:

> In message <05fb5f7f819d035fdc8556f9b4842b98.squirrel at webmail.sonic.net>,
> "Rick
>  Karlquist" writes:
>
> >The general consensus was that
> >all foams were more or less similar thermally,
>
> There is indeed very little difference, in particular if the foam
> is encapsulated so the open/closed bubble difference is eliminated.
>
> These days aerogel is the big thing, and Aspen Aerogel's "spaceloft"
> series of products are seeing a lot of use in tight spaces.
>
> It is also possible to buy aerogel as granulate, for instance from
> United Nuclear, but be aware that it will draw moisture like there
> is no water tomorrow, so always use gloves and a respiratory filter.
>
> I'm not sure the mechanical strength of aerogel would be any use
> for military OCXO's[1], but for lab-settings, it would work fine.
>
> Poul-Henning
>
> [1] People tend to forget that aerogel is one of the strongest
> materials *relative to its weight*, and at the same time the
> solid with the lowest density.  The first thing people do on
> picking up a piece of aerogel is typically to crush it.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
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