> Does any one know a test for measuring the degree of cure for solder resists that works and provides a useful measurement. One of our students recently looked at this without much luck. He found some correlation between the IPC/BS pencil hardness test and tests with the "more scientific" Vickers micro-hardness test, but the Vickers test proved tricky to get quatative results from (perhaps more sophisticated micro hardness equipment would help). It is difficult to prepare DSC test samples that are representative of manufacturing conditions - if you cut out a small peice of coated board the results are dominated by the PCB properties - I had wondered about printing onto something like PTFE & then peeling of the film for testing (how are you preparing your samples Bob?). Differential Photo Calorimetry might be an alternative. David Whalley