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Richard, The
climate we usually are worrying about in packing consists of the two factors
Temperature and Relative Humidity. The
(good) alternatives mentioned in these mails all deal with Temperature
variations and are aimed at limiting these. In general the rules are: the
thicker the insulation the slower the variations. Though NO insulation will
ever result in a solid T. All crates we use with a passive insulation slow the
transfer from the T outside to T inside with about 8 hours. RH, even
though not mentioned in the mails, however is much easier handled. Any airtight
packing with a limited amount of air around the object will stabilise the
humidity-content and thereby the RH of the object. Plexiglas will not
buffer against T but can buffer RH. It is a very expensive and awkward solution
though since properly sealed polyester sheeting will do the trick as well. Even
though not mentioned in the original mail I would like to point out that your object
is at least as sensitive and might very well be more sensitive to shocks and
vibrations as to Climate. For
more information on that topic feel free to contact us or go into the CCI site
and look at the PadCad software. Jaap van der Burg Van:
pacinlist-bounces@pacin.org [mailto:pacinlist-bounces@pacin.org] Namens Hinson, Richard Thanks, Geoff. Richard From:
pacinlist-bounces@pacin.org [mailto:pacinlist-bounces@pacin.org] On Behalf Of Geoff Browne Richard, We use USG pink board or
Dow Blueboard insulation, with R-10 insulation value to insulate our
“Severe Duty” crates. You could additionally line the inner case
with Marvelseal or a similar reflective liner – household “Space
blanket” insulators reflect better than 95% of radiant energy in BOTH
directions. From a reliable source, I
also understand that pink board and blue board have passed Oddy tests. Also, if you’re
short on time or suppliers, both Ethafoam and Ester polyurethane foam have very
similar insulation value to pink board and blue board. Foamcore would likely
also work well, better than Plexiglas, which being denser would be more of a
conductor than an insulator. Geoff From:
pacinlist-bounces@pacin.org [mailto:pacinlist-bounces@pacin.org] On Behalf Of Hinson, Richard I'm looking for
information about making climate-control boxes for traveling a small painting
on wood panel. Have any of you out there ever used plexiglass boxes that
can be sealed as inner boxes when shipping delicate art? Is there an advantage
to using plexiglass over 1/2 inch thick corrugated plastic? Are there better
materials to use other than these? |