HASL does not leave a flat surface for the screen print operation, this is especially true for very fine pinch boards. Plus OSP is a "cleaner" process, MANY of the fab shops are not properly equipped to clean boards after the HASL operation. If a fab shop can't clean a board to <3 mg. cl. sq. in. they shouldn't sell boards that are to be used in a no-clean process. I'm sure CSL will add to this one. This is a BIG issue to all of us building high reliability products. >>> Sheila Smith <[log in to unmask]> 01/23/98 03:27pm >>> Hello, Please refresh my memory ... what are the advantages/disadvantages of HASL over other processes? Specifically, why would a Customer direct a PWB supplier that HASL is not to be used ...? Sheila Smith ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################ ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################