Hi John:
> >For example, at a previous employer, I observed several instances of FETs
> >(in a 3kVA instrument) exploding and sending molten metal (mostly from the
> >leads and the lead's solder pads) through chassis vents, that subsequently
> >caused the surrounding cheesecloth to ignite.
>
> WOW! I wouldn't have though that there would be enough energy in the
> droplets after their flight through the air to cause ignition. Did you
> treat the cheesecloth with potassium nitrate solution before the test?
Molten metal has:
high temperature
high stored energy
high thermal conductivity
A small drop (1-2 mm diameter) of molten
copper falling through about 0.4 meter
will ignite non-flame-retardant plastic
material (I've done the test and have the
pix).
Very much smaller pieces would ignite
unalduterated cheesecloth.
Best regards,
Rich
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