Electronics Forum: exposure (Page 1 of 29)

Thiourea exposure in manual soldering of immersion tin PCBs

Electronics Forum | Mon Jun 02 15:09:10 EDT 2014 | davef

I've never heard of anyone affected by thiourea during assembly soldering operations. I believe the greatest concern of exposure to thiourea is during the board fabrication process. BR ... davef

Thiourea exposure in manual soldering of immersion tin PCBs

Electronics Forum | Sun Jun 01 03:42:49 EDT 2014 | sync40

Hello to everybody in this forum, I would like to know any information that you kindly may have about the following subject: We very often do manual soldering assembly of immersion tin finished PCBs. Since thiourea is used in the formulation of the

Thiourea exposure in manual soldering of immersion tin PCBs

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

Thiourea exposure in manual soldering of immersion tin PCBs

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

Thiourea exposure in manual soldering of immersion tin PCBs

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

Thiourea exposure in manual soldering of immersion tin PCBs

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

How much is the exposure tolerance for PCB auto dry film?

Electronics Forum | Fri Sep 28 00:50:40 EDT 2018 | benny

How much is the exposure tolerance for PCB auto dry film?

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.

How much is the exposure tolerance for PCB auto dry film?

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

PCB Material selection

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

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