I must be mad sending this to challenge The Oracle himself but....

The real beauty of the OA process is that it required only water - as
distinct from Aqueous Process where Water Soluble, or some would say Water
Washable fluxes were used that required some cleaning chemistry.

Aqueous processes I always thought of as a misnomer and that it should be
called Semi-Aqueous - ergo water only v water plus chemistry.

However, the drawback with the Water Only approach is that it proved to be
inadequate for some of the newer low stand-off devices such as micro-BGA,
flip-chip and some of the smaller discreets <0604. Saponification had to
added in order, not only to get under such devices but, more importantly, to
get the darned stuff out from underneath including the "dissolved"
contaminants.

IMHO - Graham Naisbitt

> I installed the first OA (misnomer, WS is better) full scale
> wave-soldering production line in Switzerland (if not in Europe) as long
> ago as 1965. The company in question is still using it,four soldering
> machines later. I have since aided in many others, throughout the world.
> Advantages of WS:
> - better quality soldering with fewer rejects
> - more tolerant of poorly solderable components
> - widest operating window
> - no expensive cleaning products
> - minimal pollution from overall process
> - lowest production costs
> Disadvantages:
> - requires good process control
> - unforgiving of errors
> - good quality cleaning equipment rarer than you think
> - flux itself is fairly corrosive
> Summary:
> - requires a serious approach and qualification
> - with this proviso, this is the way to go.
>
> Brian
>
> Dehoyos, Ramon wrote:
>>                 Hi Technetters:
>>                 Has anybody done a comparison study of RMA/OA fluxes for
>> wavesolder?  Or any personal experiences in this regard will be appreciated.
>>                 Thanks in Advance
>>                 Ramon
>>
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