Hi Technetters,
I have a white residue coating all over my reflow oven innards (almost looks like white fungus). How can I absolutely be certain that it's flux and not anything else?are there any tests available for this? I am planning to check the oven exhaust for correct air flow rates.....anything else I should be looking out for?. We are using a water soluble halide free flux and SnPb solder

Thanks in advance

Amol Kane
M.S (Industrial Eng.)
Process Engineer
Harvard Custom Manufacturing 
941 Route 38  Owego, NY 13827
Phone: (607) 687-7669 x349
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