[log in to unmask] wrote: > > All, > > Would like to know if fresh no clean flux should contain water. It depends on the no-clean flux. IPA-based fluxes do not contain water except as a minor contaminant. I don't have a concentration level, but it will be the water level of the fresh IPA used to prepare the flux. There is no reason for the water except that IPA with a little water is a lot cheaper than IPA with almost no water. IPA-based fluxes will absorb water if exposed to humid air, allowing the water content to increase with time. VOC-free, no-clean fluxes use water instead of IPA as the solvent, 95-98% by weight. The reason for the water is that IPA is a VOC, so water is more environmentally benign. ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################