Good morning Nigel,
Somehow, I have become our company's sanitizer expert, largely because I do
the testing for the effects of residues.  So I have been doing SIR testing
on sanitizers in uncleaned form, to represent what would happen if it got
onto an active assembly; on samples that have been rinsed with 50/50
IPA/water; and some test boards that have been rubbed around on a surface
cleaned with the sanitizer to see if anything transfers.  So far, I like
the sanitizers that don't have chlorine as an activator, like the
alcohol/peroxide blends.  Some chlorinated sanitizers, evan at low
concentration I have found to be corrosive.  I have a lot more testing to
do and am considering writing all this up for one of the upcoming
conferences.

*Douglas Pauls *| Principal Materials and Process Engr | Advanced
Operations Engineering

*COLLINS AEROSPACE*

400 Collins Road NE, MS 108-101, Cedar Rapids, IA  52498  USA

*Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773

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On Thu, Jun 11, 2020 at 2:43 AM Nigel Burtt <[log in to unmask]> wrote:

> Did we ever come to any conclusions about "safe" disinfectants to use in
> electronics manufacturing/PCBA assembly areas, before all the old heads
> started getting 'Nam hooch flashbacks?
>
> The 'Formula 409' mentioned seems to be uniquely US product and
> unavailable anyway. All the good stuff, whilst it is good for cleaning
> benches mats etc  appears to risk leaving residue that may be corrosive if
> any contaminates product.
>
> Anyone using stuff like 'Versan' broad spectrum disinfectant (active
> ingredient low % sodium hypochlorite) or 'Bio-Hygiene' all purpose
> sanitiser (active ingredient lactic acid)
>
> Is dilution only with DI water recommended with these types of cleaners
> rather than straight from the tap/faucet?
>