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Maker Pro

Temperature indication by effect on plastic part labels?

N

N_Cook

Jan 1, 1970
0
Valve amp with the three main lumps made by the same manufacturer and the
same sort of 0.05 mm soft white plastic part labels on the outside , so PVC
or polythene perhaps.
Output Tx label as original , choke just starting to show signs of
ruckling/cockling, and the mains transformer noticably ruckled , still same
white and footprint is the same ie the edges are in the original position.
So mains Tx has got the hottest presumably, any guesses as to what sort of
temperatures, and what if the label was seriously ruckled with distorted or
unreadable script or discoloured and shrunken footprint ?
 
N

N_Cook

Jan 1, 1970
0
From trying to find thermochromic materials, this is some data I got along
the way, from trying Mylar film (or metalised plastic anyway) ;
bubbles/wrinkles 75 deg C, shrinks 80 degree C and shrunk to 1/4 95 deg C so
pvc and polythene probably similar
 
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