My company currently has a requirement for preheating circuit boards before
soldering chip components (capacitors, resistors) to the board to avoid
thermal shock to the part.  For manual installation or remove/replace
operations with a solder iron, the requirement is to heat the board on a hot
plate or hot air nozzle for 5 minutes before soldering. We typically work
with epoxy/glass or polyimide/glass boards and the size of the parts varies.

I was wondering if other companies have similar requirements for preheating.
How long is the preheat and at what temperature?
Any experience without preheating boards (type of parts, boards, solder iron
temp, any damage seen on components)?
Specifically I would be interested in data that anyone might have on this.
Thank you
Tom Lesniewski
TRW Space & Electronics

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