Electronics Forum | Mon Jun 02 20:38:42 EDT 2014 | davef
I believe that you get better responses when you start a new thread, but that's just an opinion, not a rule. BR ... davef
Electronics Forum | Sun Jun 01 13:25:26 EDT 2014 | davef
Eurolanders and Asians are the primary users of immersion tin. In the US, the use of immersion tin is restricted due to the concern over the thiourea that used in tin plating process. Thiourea is a suspected carcinogen. I’m inclined to say, “aww, as
Electronics Forum | Sun Jun 01 13:50:12 EDT 2014 | sync40
Thank you for your reply davef. Although the US restriction, I think that there are plenty of users of immersion tin in Americas, mainly low-volume fabs that do not plan to outsource finishing, or do not plan or can not invest in a HASL. If we res
Electronics Forum | Mon Jun 02 15:51:17 EDT 2014 | sync40
Thank you so much again davef for your new reply. This past weekend I was looking for more information regarding this subject, but, as you stated there is no information about thioruea concerns during assembly soldering operations, mainly focused in
Electronics Forum | Fri Sep 28 00:50:40 EDT 2018 | benny
How much is the exposure tolerance for PCB auto dry film?
Electronics Forum | Sat Sep 29 04:55:49 EDT 2018 | sanneyyu
for pattern position with +/-2mil tolerance, pattern width may minus 0.5mil max with the traditional auto exposure.etching tolerance determined by the base copper foil.
Electronics Forum | Fri Sep 28 02:48:46 EDT 2018 | teresat2
Principle A layer of photosensitive material (photosensitive oil or dry film) is applied to the copper foil on the board surface, and PCB manufacturer should be use the position is exposed by black film, This applies to most PCB factories, especially
Electronics Forum | Thu Aug 11 20:03:41 EDT 2022 | SMTA-69946521
I have a question about Humidity Indicator Cards (HIC) in sealed PCB packages. If a PCB package is temporarily opened where the HIC card indicates 20% humidity exposure and then the PCB package is resealed with a new HIC card. How is the 20% moisture
Electronics Forum | Wed Jun 21 14:14:43 EDT 2000 | Gary Hunt
I need to construct test boards for which will be repeatedly subjected to Highly Accelerated Stress Screens, (HASS), and am looking for recommendations for materials. Would an Epoxy Glass or an Epoxy Glass Composite be least suceptible to exposure t
Electronics Forum | Mon Nov 19 11:59:54 EST 2001 | seand
Hello everyone, Is it possible to quantify what you consider "Low Level" vs. High Level x-ray exposure? Is anyone aware of what level of exposure the airlines typically use in security applications? Thanks, Sean
