Victor, Too broad a question. Depends on the mask. Depends on the solvent, time, and temperature. Depends on what heat and for how long. Etc. Doug Pauls Principal Materials and Process Engineer Rockwell Collins On Thu, Feb 9, 2017 at 1:57 PM, <[log in to unmask]> wrote: > Fellow TechNetters; > > Should the PWB/PCB solder mask be IMPERIVIOUS to a wide range of > process solvents? > What is the temperature break down of solder mask? > > Victor, >