Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Post reflow cleaning

#27306

Post reflow cleaning | 18 February, 2004

We are having problems removing the flux residue from our boards in our batch cleaner. We use Indium SMQ92J which I hear is notoriously difficult to remove. Can anyone suggest a similar paste (price/performance) that has better results with cleaning without having to use high concentrations of wash chemical.

Thanks in advance

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Mike Konrad

#27310

Post reflow cleaning | 18 February, 2004

You have two choices� Change your paste or beef-up your wash chemical.

I�ll let others discuss paste options but as far as wash chemical is concerned, consider chemicals specifically designed for such applications.

Zestron is promoting A300 as suitable for �difficult� pastes. A300 is only practical in wash systems that are equipped with a wash water recycler.

Petroferm and Kyzen also have suitable offerings.

Zestron: http://www.zestron.com

Kyzen: http://www.kyzen.com

Petroferm: http://www.petroferm.com

Mike Konrad Aqueous Technologies (909) 944-7771 ext 29 www.aqueoustech.com konrad@aqueoustech.com

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#27311

Post reflow cleaning | 18 February, 2004

I actually have Kyzen's Aquanox 4520 in there now. Trace Melton at your place is working on the problem for me also. I have sent him detailed pictures showing the problem. I will post any solution we come up with for the benifit of other smtnet'ers.

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greg york

#27361

Post reflow cleaning | 23 February, 2004

Is this a white residue on the joint and surrounding area's, if so the only thing I can remove it with after cleaning is an Isopar(Isoparrafinic hydrocarbon), my guess looking at other pastes where I have seen this is it is a type of wax used in formulations which is notoriously difficult to get off and being a wax not that soluble in many semiaqueos solutions.Isopars are generally not water miscible so must be used post wash.Hope this helps solve problem

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greg york

#27362

Post reflow cleaning | 23 February, 2004

Is this a white residue on the joint and surrounding area's, if so the only thing I can remove it with after cleaning is an Isopar(Isoparrafinic hydrocarbon), my guess looking at other pastes where I have seen this is it is a type of wax used in formulations which is notoriously difficult to get off and being a wax not that soluble in many semiaqueos solutions.Isopars are generally not water miscible so must be used post wash.Hope this helps solve problem

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greg york

#27363

Post reflow cleaning | 23 February, 2004

Is this a white residue on the joint and surrounding area's, if so the only thing I can remove it with after cleaning is an Isopar(Isoparrafinic hydrocarbon), my guess looking at other pastes where I have seen this is it is a type of wax used in formulations which is notoriously difficult to get off and being a wax not that soluble in many semiaqueos solutions.Isopars are generally not water miscible so must be used post wash.Hope this helps solve problem

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Ken

#27365

Post reflow cleaning | 23 February, 2004

Why are you cleaning a NC solder paste?

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jdumont

#27367

Post reflow cleaning | 24 February, 2004

We clean some of our boards because we are in the medical and military industries.

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