Gloves turned green while holding hot PCBA

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Today the line experienced the white gloves turns green at t... - Apr 26, 2002 by Yngwie

Sounds like the mask wasn't properly cured. What kind of so... - Apr 26, 2002 by blnorman

Thanx for the feedback. The solder mask is PSR-4000 ( nee... - Apr 27, 2002 by Yngwie

Yngwie

#19695

Gloves turned green while holding hot PCBA | 26 April, 2002

Today the line experienced the white gloves turns green at the point of contact when holding fresh board that came out from wave soldering. Was that the effect of inproper solder mask curing at PCB house during fabrications ? For a proper cured solder mask, what is the max temperature the mask can withstand.

Your feedback is very much appreciated.

thanks

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blnorman

#19696

Gloves turned green while holding hot PCBA | 26 April, 2002

Sounds like the mask wasn't properly cured. What kind of solder mask is it? We use a photoimageable mask on our boards. The secondary cure is ~ 90 minutes @ 150�C. One of the cured mask tests is solder bath resistance where it has to resist degradation at 290�C for greater than 10 sec.

IPC TM-650 has tests for solder masks, I'm not sure of the specific test methods though.

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Yngwie

#19703

Gloves turned green while holding hot PCBA | 27 April, 2002

Thanx for the feedback.

The solder mask is PSR-4000 ( need to confirm this - not too sure ). If the board got in touch with the solder bath, for the contact time of 3 - 6 secs, this should not be the case for proper curing process right ?.

thanx again.

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