Hi ya' Bruce! If you don't go above 180 degrees C. you should be oakie-dokie...actually the temp limit according to IPC-SM-786A is 220 degrees...and they also detail that statement by saying that's the temperature as measured at the top center of the part. This is just a comment and a question, I was kinda' wondering if anybody has actually had package cracking that they've been able to witness first hand with their own two eyeballs on the floor while it's being built? I ask this because in the 10-years that I've been doing this I never have. Not to say that none of the boards I've built have never had cracked packaging, because I didn't learn a lot about this stuff until after 3-4 years or so working in this industry. But are the cracks ever visible? Or are they always microscopic? Just curious...that's all. -Steve Gregory-
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