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Not in the least surprising. May I refer you to Chapter 8 "Contamination
due to components" of a certain book? This does not specifically refer
to connectors, but more to hot-tinned parts, lead frames, the plastics,
electroplated parts and so on. In it, there is mention of tinning using
unwashed or poorly washed water-soluble fluxes and horrendous levels of
measured ionic contamination. In Appendix 1 of the same work, I made a
suggestion for a standard for the cleanability of components. This idea
has occasionally been referenced in other papers but we still await,
many years later, such a standard.
Brian
On 15/07/2011 20:19, Steven Kelly wrote:
> Hi All,
> Today is my day for headaches.
> We assembled a flex circuit (put a couple of connectors on) and did the Ionic contamination test after our standard cleaning procedure and failed.
> After much scratching of heads we decided to take a bare flex - solder it - not add the connectors and test - passed the ionic test easily.
> We then took the connectors and put them in the ionic unit - one hit 76 ug/cm2 as received and 6.9 after cleaning. The other was 9.6 ug/cm2 as received and 6.6 after cleaning.
> So my question is - do the connector manufacturers have to sign up for a certain cleanliness level and second question what the *&?" do I do now.
> Regards Steve Kelly
>
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