Vigon 200 works fine, but remember the high pH (can be as much as 11). Good rinsing is a must.
/Inge

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: måndag 8 februari 2010 07:33
To: [log in to unmask]
Subject: Re: [TN] Flux Cleaning

The more the flux is 'cooked', the harder it is to remove. As you apparently use a rosin-based flux, it may become very difficult. It is not helpful to say you use an ultrasonic cleaner without telling us your soldering time/temp profile, cleaning products and procedure, ultrasound data etc.

I suggest you consult your flux manufacturer for advice on how HIS flux residues may be best removed. For cleaning to wire-bonding standards, you will probably have to go to more than a solvent, such as Vigon or Kyzen products, if the flux maker cannot help.

There is no 'best' product.

Brian

jonathan noquil wrote:
> Hi All
> What is the best flux cleaning agent that can effectively remove flux 
> on ENiAu bond pads?
> We solder a copper strap on the silicon with PbSn5 at 350 degc 
> temperature, the flux contaminates the bonding pads.
> Paste is from Heraues. We used an ultrasonic cleaning equipment.
> During Au wirebonding, we have lots of bond off occurences? We tried 
> to do FTIR on the surface and found some traces of that resin contamination.
> 
> Is the flux difficult to remove with flux cleaning agent when it was 
> reflowed at high temperature?
> 
> 
> Thanks
> 
> 
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