[null and void]

We had one operator who wasn’t allowed in the photolithography line. Her perfume interfered with the photoresist...

[pfflier]

We had unusual failures in final test of printed circuit boards right after thanksgiving one year. Lots if internal shorts and bridges. We found traces of aluminum in failure samples.

Turns out that people who had aluminized christmas decorations at home were bringing the particles to work on their clothes and shoes. Even though we wore lab coats the particles were mobile enough to get into the air and mix with the conformal coat during the application process, the last step before final test.

[biggerten]

We had a vapor phase degreaser that the gals in PCB assembly found worked wonderfully and much more quickly than cleaning by scrubbing.

Unfortunately, it’s real purpose was to clean stainless steel parts for penile implants, and left traces of flux on parts bound for the cleanroom.