Typically HASL flux/fluid is a high bp organic + activator, similar to a  
water soluble flux without the volatile thinner. Usually these were designed to  
be water soluble, since board fab processes are all water-based, except for 
some  solvent based processes used in Scottish board fab houses. 
That might be the problem here- HASL residues left on the incoming boards  
which your shop is trying to remove using solvent technology. 141b has about the 
 same characteristics as 1,1,1-trichlorothane, but it will benefit from the  
addition of methanol as noted by BNE.  

Bill  Kenyon
Global Centre Consulting
IPC TAEC  Lifetime Member
3336 Birmingham Drive
Fort Collins, CO 80526
Tel:  970.207.9586   Cell:  970.980.6373




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