Date : 17/8/96 15:34 Msg From: ATUL RASTOGI Dear martin, The solder mask problem you have defined is not because of temp at wavesoldering.Solder masks can withstand a temp of 280 to 300 deg C.Your problem could because of any of the basic 2 reasons.One is the problem of bare PWB itself or second could be the compatibility of your wave flux with the solder mask ink. The basic reasons for the problem in bare PWB could be - 1.There could be a contamination on the copper traces resulting in poor adhesion. 2.There could be moisture entrapped in the solder mask ink. 3.There could be insufficient curing of the solder mask. You need to closely work with your PWB supplier and the flux supplier to sort out this problem. Thanks Atul Rastogi Altos India Ltd >>>>>>>>>>>>>>> Posted: Thu, Aug 15, 1996 12:11 PM Msg: HJJG-2306-8979/20 From: ("RFC-822": <TechNet-request(a)ipc.org>, SITE:INTERNET) To: ("RFC-822": <technet(a)ipc.org>,SITE:INTERNET) CC: AIL.EHTP/PCL Subj: Ass: Soldermask problem! RFC-822-Headers: Resent-Date: Tue, 13 Aug 1996 07:57:59 -0700 Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> Encoding: 28 TEXT X-Mailer: Microsoft Mail V3.0 Resent-Message-ID: <"f9q1S3.0.UP6.ie74o"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/5718 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask] We are experiencing a problem with a soldermask on a a PCB during wave soldering. The mask tends to degrade during wave soldering and remove after cleaning. This defect is only seen over thin copper traces (especially around vias) and not over the bare PCB. Can anyone tell me what is the typical temperatures a solder mask can withstand during the wave soldering process (e.g. preheats, max. temp and time etc.) Also is anyone else having this problem or can the flux or the cleaning process be causing this problem. Thanks in advance Martin Dooner AMT Ireland University of Limerick Plassey Limerick [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** <<<<<<<<<<<<<<< *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************