Has anyone used ordinary (plumbing for copper pipe joints) flux. It is 
inexpensive, not acid variety, comes as a paste, almost a gel. Would 
this be acceptable from a chemical action viewpoint? My favorite is 
Oatey #5 soldering paste. hazardous ingredients are  zinc chloride and 
ammonium chloride. I guess the chlorine might be an issue.

On 7/23/2010 7:37 AM, cdb wrote:
>
> :: Solder sucker and/or desoldering iron (vacuum) on each individual
> :: pin:
> :: Hard to get all of the pins cleaned out enough to pull the chip
> :: out,
>
> I don't recall how many layers your board has or if it has large power
> planes, but gel flux (expensive'ish) dotted around the pins to be
> desoldered, and then a desoldering iron applied with 1mm or less tip size,
> allow solder to heat through hole etc, wiggle tip head around, the pin
> should move, then suck.
>
> Before buying gel flux, often applying new solder to the pin will 'reflux'
> the joint plus act as a interface (can't think of the proper word at the
> moment) to the desoldering tool.  Solderbarid can also be more effective
> sometimes I've found than a desoldering iron.
>
> Motto: To desolder, solder is needed!
>
> Colin
> --
> cdb, colin@btech-online.co.uk on 23/07/2010
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