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July 2011

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Sat, 16 Jul 2011 09:04:11 +0300
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text/plain
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text/plain (47 lines)
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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