Miguel, The first place to investigate would be your soldering iron tip temperature. With no-clean/low residue materials, tip temperature should be between 600-700 degrees F. If the tip temperature exceeds 700F, you will heat this flux too rapidly, causing it to "explode" of sorts, resulting in the splashes you are experiencing. With NC/LR materials, a good heat bridge must be made prior to applying solder to the connection point. In product failure analysis evaluations we have done, there is usually some evidence of "charring" when the tip temp is too high. This would look like a black residue (burnt flux) around the joint area, possibly contained in the splashed material also. Hope this helps. Pat Kane Contamination Studies Laboratories ############################################################## 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 ##############################################################