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
---------------------------------------------------------------------------------