And, if you look inside carefully, are probably *also* much smaller (in protected volume) than the paper-rated ones. Very often they sell the same outside box, with an extra liner added for the "media-rated" version.
(Most of the cheap paper-rated ones use gypsym board in the walls; it gives off water when heated, which helps dissipate heat. This turns out to be very bad for magnetic media. Plus the 125F temp limit for media of course. The liner seals against the moisture from the gysum, plus provides more insulation.)
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timeasmymeasure
Re: Fire Safe Boxes
Date: 2006-04-05 10:37 pm (UTC)(Most of the cheap paper-rated ones use gypsym board in the walls; it gives off water when heated, which helps dissipate heat. This turns out to be very bad for magnetic media. Plus the 125F temp limit for media of course. The liner seals against the moisture from the gysum, plus provides more insulation.)