Iain Ensolv is based on n-propyl bromide which is a very strong solvent (much stronger than CFC-113). Some laminates, depending on their state of cure, could well be attacked. I'm not quite clear about your cycle: were the boards in the freeboard zone overnight? If so, anything could happen, especially if the refrigeration is up the pole. My guess is that even a 30 min cycle is risky. BTW, if your freeboard isn't working, you are risking undue workplace emissions. This solvent is quite toxic (most manufacturers recommend operator exposure levels in the 5 to 25 ppm range. As a ref, the OELs for carbon tet are from 3 - 10 ppm, depending on the country.). It is also ozone-depleting. Brian [log in to unmask] wrote: > > Teckies, need a little help hear! > > I have recently experienced a problem whilst cleaning double sided FR4 > dual technology multi-layer boards that had been wave soldered. > The boards (4 off) were put into a fully automatic batch cleaner end of > day shift which uses a Brominated solvent 'ENSOLV ionic' .and removed > the following morning first thing. > The cleaning m/c is a vapour degrease system which has a refrigerated > coil at the top of the bath, this provides a free board zone above the > vapour which forms part of the cycle (draining). =20 > The cycle time is usually 30 minutes. > > The problem is that the boards appear to show weave / pre-preg > separation across all of the boards leaving the weave visible but not > through to the top layer. Around thru' hole terminations the board has > clearly delaminated. > > I performed 100% inspection on another one of the wave soldered batch > which appeared fine. I repeated the cleaning exercise and the post > cleaning result was the same. =20 > > Two things to note, firstly, when the board was removed after the > second= > > cleaning operation the m/c had malfunctioned as the cooling coil had > not= > > worked so the free board zone was hot with vapour. What I cannot > guarantee is that this did not happen during the first cleaning > operation (4 off), I can't say I noticed the boards being hot but I > suppose the m/c could possibly have malfunctioned part of the time. > Secondly, these boards have been cleaned previously in the m/c but > during a shift and removed after the cycle. > > Has anyone experienced this type of occurrence? > > CIA, > Iain. > > ******************************************************************** > This email and any attachments are confidential to the intended > recipient and may also be privileged. If you are not the intended > recipient please delete it from your system and notify the sender. > You should not copy it or use it for any purpose nor disclose or > distribute its contents to any other person. > ******************************************************************** > > --------------------------------------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------