Re: bans on HCFC-141b

This substance was banned from use as a solvent on 1 January 2002 across 
the EU (EC Regulation 2037/2000). There are certain exemptions to the 
HCFC use ban e.g. a temporary exemption for precision cleaning of 
electrical and other components in aerospace and aeronautics 
applications where the use ban shall enter into force on 31 December 2008.

If you are not in that industry sector exemption, you should not be 
using it. If you do fit into that exemption, you have exactly three 
months to qualify a substitute cleaning process.

Sorry, but that's the law.

Brian

Juan T. Marugán wrote:
> Good evening from Spain.
> 
> The problem we have is the following. After soldering, we conformal coating a 
> class 3 polyamide board (blind vias) with Parylene C. Until this moment, all is 
> OK.
> 
> Then, the board pass the ESS -thermal cycling-, and it is at this moment 
> when appears a halo around the solder joints. The test tape performed in that 
> area fails. I�ll send some pictures to Steeve Gregory for reference.
> 
> We have coated at the same time (and processed in the same conditions, 
> that is soldering, cleaning�) the �suspicions� polyamide boards with other type 
> of boards (polyamide & rigid). We only obtain negative results with the first 
> ones.
> 
> We have sent some boards to an external lab for FTIR testing, and we are 
> waiting for the final results.
> 
> Our though is that cause of the problem is the PCB, but we need to 
> demonstrate it. It's like some contaminant appears under the conformal 
> coating caused by the temperature (from the inner layers of the PCB?)
> 
> So, what we need is that somebody turns the �light� on.
> 
> Thank you for your help.
> 
> 
> 
> Juan T. Marugán López
> Supply Chain Management
> Indra Sistemas SA (Spain)
> 
> [log in to unmask]
> www.indra.es
> 
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