We are using Urethane coating on an assembly that uses  63/37 solder. We 
are using organic water soluble flux. We are Ionic testing after wash and 
we are well within IPC cleanliness specifications. We installed a 
selective coating machine and in our initial run of product we had some 
small bubbles that look like foam. Our customer does not like it but our 
stand is that it meets IPC-A-610 and J-STD-001 requirements since there in 
no obvious voids between conductors. They were worried about corrosion if 
a bubble was against a lead. The bubbles are fully encapsulated. Does 
anyone think this is a valid concern? 



Joel Alexander
Quality Assurance Manager
TT APSCO, INC. 

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