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January 2007

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Subject:
Re: IPA cleaning
From:
Brian Ellis <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Wed, 10 Jan 2007 14:35:37 +0200
Content-Type:
text/plain
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text/plain (38 lines) 
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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