Water-soluble flux
 Disclosed is a water-soluble solder flux and a method of fabricating circuit boards which does not adversely affect the insulation resistance of the boards. The flux applied to the board comprises a vehicle including at least two random copolymers of polyalkylene glycol with various amounts of ethylene oxide and propylene oxide. The flux also exhibits a low viscosity for improved copper coverage. 
London Chemical Company AT&T Bell Laboratories
B H
B23K H05K
inventional inventional
Mir K. Chia C.
Ali Chang