Roller Tin is the cheapest out I didn't know anyone still offered it. It is an old crude method of applying SNPB to single sided PCB's. HASL, is Hot Air Solder Leveling where the PCB is dipped into molten SNPB then air knives blow off the excess SNPB 'leveling' the solder. Leveling is a stretch too - because it creates sags, drips and runs. Not real level. Some of those defects are insignificant to the assembly process, unless they get out of control. Rolled tin is for very cheap things like punched SS PCBs for toys. The cost of HASL is so low, I haven't seen a hot rolled board in ages. RS Phone 877-622-EMS1 Fax 877-622-3672 Cell Ph 989-245-2606 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Michael Bell 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 -----------------------------------------------------