Subject: | |
From: | |
Reply To: | (Leadfree Electronics Assembly Forum) |
Date: | Wed, 10 Jan 2007 14:35:37 +0200 |
Content-Type: | text/plain |
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This is almost inevitable. IPA is, and always has been, a poor defluxer.
Worse, it is highly flammable with a flash point well under room temp
(~12°C) and the vapour is toxic. So-called "no-clean" fluxes are
designed not to be cleaned and this is made worse by the higher
soldering temps of LF alloys. Either do not clean or, if you must clean,
use a water-soluble chemistry and clean with water (cheap, no flash
point, non-toxic).
Brian
S.Badrinarayanan wrote:
> Dear All,
>
> After wave soldering we clean our lead free boards with Iso Propyle Alcohol
> (IPA)even though we use a no clean flux. The boards are immersed in IPA tank
> and cleaned.Recently we are wittnessing white patches on the board after this
> cleaning process. How can I eliminate the white patches. Is there any
> alternate cleaning method available. Advance Thanks for the help.
>
> Badri
>
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