Michael,
The best guesses have been undercured solder mask and flux. Is the
subcontractor using the same board vendor, the same mask, the same flux, the
same oven, and the same reflow profile? There is one older solder mask that
really stinks - to the point you want to puke, so even a nominally cured one
can do it too. What about under (or un)cured epoxies or silicone
glues/sealants? Is the subcontractor using a different source of PTH can
type capacitors? Some have amine based electrolytes that smell awful, if
they leak (which will give you no end of other problems, trust me :) ).
And Steve made an excellent point about ventilation.
Lead has no odor and neither does lead oxide. The only "simple" lead
compound I know of that has any smell is PbH4 and you only get that from
magnesium/lead alloy acid hydrolysis or cathodic reduction of lead salts.
You won't get it from molten tin/lead in a solder pot.
regards,
Bev Christian
Nortel Networks
> -----Original Message-----
> From: Chad Gustafson [SMTP:[log in to unmask]]
> Sent: Thursday, August 19, 1999 6:44 PM
> To: [log in to unmask]
> Subject: Re: [TN] Noxious Fumes from Reflow Operation
>
> Michael,
>
> This is not my area, but it is possible that the fumes are coming from
> Lead.
>
> Chad Gustafson
> Manufacturing Engineer
> JMSPI
>
> >>> "Mcmaster, Michael" <[log in to unmask]> 08/19/99 04:29PM >>>
> I'm a board fabricator that sub-contracts to an assembly shop to run
> some boards through a reflow assembly shop. We've recently
> (significantly) increased the volume of parts going through this
> process. The assembly shop is complaining about a "noxious" odor while
> runing these boards. While they are trying to figure out how to capture
> the fumes, I'm trying to figure out what they are. I have an Industrial
> Hygenest who can tell me how much of something's there, if I can tell
> him what it his. MSDS's being what they are, I'm not too confident that
> I'll be able to isolate all the possible candidates.
>
> I figured from the worldwide audience of assembly experts on Technet, I
> ought to be able to get a couple of ideas about what the odor might be.
> Does anyone have any suggestions?
>
> I'd also be interested if anyone knew of a lab that could bake a board
> or two, capture and analyze any volatiles emitted.
>
> Thanks in advance for any feedback.
>
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