To what extent has the PCB industry changed to single ply for pre-preg as opposed to core which has been available in single ply for a long time. What are the fears about single ply pre-preg? Are 2 plies really better than 1 thick one? What are the attitudes towards so called "green laminate"? Is it simply a case of eliminating bromine, is it vital to meet UL V- 0 if the alternative could have such an impact on the environment? These questions were prompted by a major user of PCBs in Europe. George Wheadon Nelco UK