Hi All, Can anyone help with this problem a PCB fab customer of mine has? Process - Electrostatic spray solder mask. Problem - Soldermask missing from areas. This seems to be related to the base laminate (FR4). When two identical boards on two different batches of laminate are processed side by side the problem is always on one batch. What effect could the laminate have? What other factors could cause the problem? TIA Geoff layhe www.lamar-uk.co.uk ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################