Doug Following from Phil's input, I should point out that if you change the solvent to a MIL Spec qualified coating, you run the risk of rendering the coating non-qualified.... because you changed the solvent. You really should check this out with the coating manufacturer before you jump. As Phil stated, additional issues that will arise involve the way in which the material cures. We select solvents very carefully to give the best handling / processing / curing characteristics that will ensure compliant results with IPC-CC-830 / IPC-A610. As you know, we also have new water based coatings, but these should NOT be mixed with anything - not even water! They are pre-blended to suit the given application method. Perhaps you would be wise in purchasing your coating pre-blended this way from your supplier? Regards, Graham Naisbitt [log in to unmask] http:// www.concoat.co.uk <http://www.concoat.co.uk> For instant access to Product Data Sheets register on the Tech-Shot area of http:// www.concoat.co.uk <http://www.concoat.co.uk> Concoat Limited Alasan House, Albany Park CAMBERLEY GU16 7PH UK Phone: +44 (0)1276 691100 Fax: +44 (0)1276 691227 Mobile: +44 (0)79 6858 2121 -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of [log in to unmask] Sent: Thursday, July 19, 2001 01:38 To: [log in to unmask] Subject: Re: [TN] White residue from conformal coating Graham, Thanks for the insights on the "blush" phenomena. How interesting that it comes up in the same discussion as your "work naked bonus". Is there any link between the type of solvent in the coating and blush, or is it exclusively humidity related? One project that has been suggested for me is to replace the toluene and xylene we use as acrylic thinners with methyl propyl ketone. If such a switch were made, would you expect a greater or lesser susceptibility to blush, or is it immaterial (no pun intended). Doug Pauls Rockwell Collins ---------------------------------------------------------------------------- ----- 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 the following message: SET Technet NOMAIL 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 the following message: SET Technet NOMAIL 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 ---------------------------------------------------------------------------------