Paper catches fire ~451F
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http://answers.yahoo.com/question/index?qid=20080903111520AA5XA5k ] [[ I actually don't like to base my opinions off of Wiki articles and Yahoo(Ask), but there are a few sites that give the same reference. ]]
Those cards don't go above ~250F or they will auto-shutoff.
Cardboard I believe to be more durable to heat.
The 451F thing is largely popular opinion based on the book "Farenheit 451" but realistically different kinds of paper will have different autoignition temperatures depending on their thickness, coatings, impurities, cotton/wood ratios, etc.
Here's the real way to find out:
Yeah that's way more complicated than pulling 451F out of your ass, but suffice it to say the resulting number IS somewhat higher than the 105C (221F) most cards shut off at.
As for the solder, yes some varieties melt at temperatures as low as 90C but those varieties would never be used for computer parts. More likely would be solders in the higher end of the temperature range - some solder doesn't melt until 450C - so I wouldn't worry too much about that.
