HI TOM,
THE MAIN PROBLEM ENCOUNTERED IN A POST REFLOW, HASL RINSE IS IMPROPER ION
CONTAMINANT REMOVAL. YOU DID NOT MENTION IF YOU WERE UTILIZING A
PROPRIETARY, OR OTHERWISE, CLEANER. IF YOUR WATER IS RELATIVELY SOFT YOU
MAY NOT HAVE ANY ADDITIONAL PROBLEMS; PROVIDING YOUR REFLOW AND
WAVESOLDER ARE PROBLEM-FREE. I.E. PROPER OPERATING AND MAINTAINANCE
PROCEDURES ARE PRACTISED.
IONIC CONTAMINATION CAN BE DETERMINED BY TESTING. HOWEVER, IF YOUR CURRENT
CUSTOMERS ARE HAPPY, WHY BOTHER.
BEST REGARDS,
LENNY KURUP TECHNICAL REPRESENTATIVE - CHEMICAL DIV.
EMX ENTERPRISES LTD., MARKHAM, ONTARIO, CANADA. 905-475-8000
On Tue, 2 Sep 1997, Thomas C Han wrote:
> Hi all,
>
> I am a small contract manufacturer located in San Jose. We use OA flux
> and water soluble solderpaste for wave-solder and reflow, repectively. I
> currently use city water for cleaning(approximately 500 gal/day). I have
> not run into any contamination problems on the PCBs from this process
> yet. Is there a need to switch to DI? If so, what are some of the pros
> and cons of using DI water?( cost, effectiveness) Also, if I do need to
> change, what is the best way to setup a system? Our current in-line
> cleaner consists of two wash chambers, rinse chamber, and a final rinse
> chamber that can utilize different source of water from the previous.
>
> Any information or suggestions would be greatly appreciated.
>
>
> Tom
>
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