Dave, I was told that the bare boards come in slightly under cured to relieve some of the stresses of the manufacturing process. This came from a man who had 30 years experience in PCB manufacturing industry. I don’t know if you can truly 'over cure' the board epoxy? Ted -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David Tremmel Sent: Friday, October 05, 2007 9:32 AM To: [log in to unmask] Subject: Re: [TN] Via plugging with LPI soldermask... Hello, Below it was stated that ' . . . the manufacturing process doesn't over cure the material'. What happens to PCB material that is overcured? Does the dialectric of the material change? Does it cause signal attenuation in the vias? Thank you in advance, David Tremmel 847 557-9574 - Phone 847 557-9573 - Fax http://ValuRecovery.com VALUE RECOVERY Quality is the nature of the service --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------