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Hmmm you could be onto summt Glatt...I would argue your points...many small ali signs have cross members to aid installation whereas many plastic signs are a cheap alternative, often fixed through the face and not supported with ali thus increasing the costs to a level that you might as well have ali in the first place...Glass will become extremely fragile under extreme heat but not break unless a force is applied. A bottle can sit in a fire an not break. It will melt if the fir is hot enough. It wont break unless corked/capped and expanding air breaks it or it is hit in some manner...and finally...the heat of a fire can be localised, scorching some plantlife, wiping out others but hey! Im no expert. The real clue here for anyone who cares would be the text still on the sign...that cetainly couldnt withstand the heat needed to melt ali, whether it was lead paint, vinyl graphics or anything else...so...plastic it is.
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