Hi Mike, We used to apply roller tin on flex circuits in the 1970's. There were two rollers through which the circuit was passed. The bottom roller dipped into molten solder. The molten solder was deposited onto the circuit as circuit was squeezed between the two rollers. The process was quite variable and hard to control as I remember. I haven't seen one of those since the late '70s. We also used a hydro-squeegee to level plated tin/lead. After that we began using "reflow ovens" to fuse plated tin/lead. Next can hot air solder leveling both horizontal and vertical; HASL was born. PR -----Original Message----- From: Michael Bell [mailto:[log in to unmask]] Sent: Monday, March 24, 2003 3:39 PM To: [log in to unmask] Subject: [TN] Roller Tinned PCB's Hi all, Just a little stumped on terminology here, what is "Roller Tinning". What is the specific differences between this method and HASL??? Are there any specific pros/cons for the Roller method??? Any information would be appreciated. Cheers Mike --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------