By Les Hymes (auth.), Les Hymes P.E. (eds.)
The impetus to create this ebook originated from numerous issues. this sort of was once the perceived price to the of a set in a single quantity of quite a lot of info pertinent to the explanations and methods for de fluxing published wiring assemblies (PWAs). This e-book is anticipated to be of use not just to these engaged within the electronics packaging but additionally to these in comparable fields looking details pertaining to conceivable equipment of facing one of many en vironmental problems with our time: the destruction of the ozone layer surrounding and keeping the planet with which now we have been entrusted. the amount of data relative to delivering PW As freed from residues advert versely impacting operation, reliability, and lifetime of digital items is develop ing, and it'll proceed to extend at an sped up fee as we search to compare our expertise wishes and needs with our environmental duties. on the time ofthis writing, which has spanned the latter section of 1989 and early 1990, the problem of selecting a brand new method of generating PW As freed from dangerous residues whereas utilizing environmentally applicable production recommendations ap peared to be the foremost obstacle of nearly all of these focused on the broadcast wiring meeting undefined. To many this intended using varied fresh ing media and/or procedure or gear improvements; to others it intended the removing of the necessity to fresh via fabrics or method changes.
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Extra resources for Cleaning Printed Wiring Assemblies in Today’s Environment
A good SIR setup allows for ease in testing many samples simultaneously, requiring some sort of switching mechanism or matrix box to individually test all samples. An example of commercially available equipment which can be programmed to apply a bias, measure the SIR at regular intervals, and 34 CLEANING PRINTED WIRING ASSEMBLIES Fig. 6. Commercially available data acquisition system for SIR tests. 6. For temperature and humidity control, one may use either an oven with a saturated salt solution controlling the humidity or a chamber with a microprocessor which controls both temperature and humidity.
For temperature and humidity control, one may use either an oven with a saturated salt solution controlling the humidity or a chamber with a microprocessor which controls both temperature and humidity. The latter is preferred simply because there is less maintenance compared to checking a saturated salt solution. Some specifications require minimum absolute SIR values as a pass/fail criterion, whereas others require a minimum SIR relative to the SIR value of a control. A relative value is preferred since it is simply allowing a minimum degradation due to the presence of flux residues.
9 shows the effect of flux selection on cleaning material choice. Not all cleaning materials can remove all flux residue types, nor do all flux residues need to be removed. 1. Rosin The vehicle in rosin fluxes is rosin or colophony, a naturally derived material from pine trees. In the United States, the word rosin usually refers to the natural substance whereas the word resin refers to a synthetically made material. In the UK, the word resin is used instead of rosin. The rosin material normally used in fluxes is water white rosin, a high grade material, similar to compounds used in varnishes and lacquers.
Cleaning Printed Wiring Assemblies in Today’s Environment by Les Hymes (auth.), Les Hymes P.E. (eds.)