Ahh, small detail here.... Remember that there is a difference between Chlorine, the element, and Chloride, a salt of the element. Chlorine, the element is added to water to kill bacteria, and it is QUITE poisonous, and thus they watch about there being too much. When you clean PCB's you introduce Chloride, NOT CHLORINE, and I have never heard of chloride being regulated. Life is in the details.... Rudy Sedlak RD Chemical Company ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################