I didn't want to have Doug catch me napthing on this.
Doug is right on the Conformal Coat choice if you want to use silicone.
The original confusion with the term mineral spirits and dry naptha came
from use.
They were originally part of TT-T-291F which superseded the E revision
and TT-T-295.
Type I was known as Varsol or regular mineral spirits with a low flash
point.
Type II was also a regular mineral spirit with a higher flash point and
slower evaporation rate.
Type III had a higher flash point and was odorless.
There was no water allowed in any of them and they all had 0.50 %
benzene content. Dollars to Doughnuts ( to coin a phrase ),the higher
flash point and lower evaporation rates caused people to mix terms like
naptha and dry together to define them.
This spec was cancelled and superseded by A-A-2904.
A-A-2904 spec was cancelled and superseded by MIL-PRF-680A.
P-D-680 was a spec for Dry Cleaning and Degreasing solvent. You would be
hard pressed not to see the Naphta and dry cleaning connection.
P-D-680 was cancelled and superseded by ( drum roll here while we pause
for the spirit of the moment and my clean getaway ) MIL-PRF-680A.
Although there is no moisture allowed I'll sign my name anyway.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Wednesday, August 24, 2005 11:17 AM
To: [log in to unmask]
Subject: Re: [TN] "Dry" Naphtha
I think we are talking about two different, but similar materials.
Mineral spirits have a slower drying time than Naphtha. Both are
petroleum distillates. I know that we order them here as two different
materials.
Technically, gasoline and kerosene are both naphtha's as well.
I think the original reference to "dry" naphtha is a more refined grade
of naphtha were pains have been taken to remove the water. I suspect
technical grade naphtha may not be pure enough. Technical grade
isopropanol also has a fair amount of water in it. If you are using a
silicone conformal coating, water is the last thing you want around.
Steve, we use Dow Corning 1-2577, which is a silicone conformal coating.
We don't use the one that you cite, but I would be happy to help if I
can.
What questions do you have?
Doug Pauls
Bev Christian
<[log in to unmask]
OM>
To
Sent by: TechNet [log in to unmask]
<[log in to unmask]>
cc
Subject
08/24/2005 12:56 Re: [TN] "Dry" Naphtha
PM
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]>
; Please respond
to
Bev Christian
<[log in to unmask]
OM>
Steve,
On this website they equate it to Varsol, virgin mineral spirits. MY
GUESS would be that we are talking about mineral spirits where the
supplier has taken some pains to make sure there is very, very little
water in it.
142 Mineral Spirits
55 gal. drum
Virgin Mineral Spirits- high flash (Varsol) (Kwik Dry Naphtha)
http://www.palmettoenvironmental.com/index.asp?action=page&name=6&subnam
e=5
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: August 24, 2005 1:40 PM
To: [log in to unmask]
Subject: [TN] "Dry" Naphtha
Howdy All!
I got a call and an email from somebody from one of our other
facilities asking about "Dry" Naphtha. I told her I had never heard
of it.
She said that on the spec sheet for a Dow DC6-1104 RTV, it calls out
to mix 80% of Dry Naphtha with it to use for conformal coating
I've done a search and can't find anything on Dry Naphtha, I called
Tomco-Harwell (where we usually get our chemicals), and called
Dow Corning as well, but nobody can tell me what Dry Naptha is, or
where to get it.
Could it also be known as reagent grade Naphtha?
Even better still, has anybody out there worked with Dow DC6-1104
that can help me out about how to apply it as a conformal coating?
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
__________________________________________________________________
This message may contain information that is privileged and confidential
to
LaBarge, Inc. It is for use only by the individual or entity named
above.
If you are not the intended recipient, you may not copy, use or deliver
this message to anyone. In such event, you should destroy the message
and
kindly notify the sender by reply e-mail.
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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
-----------------------------------------------------
---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential
information, privileged material (including material protected by the
solicitor-client or other applicable privileges), or constitute
non-public information. Any use of this information by anyone other than
the intended recipient is prohibited. If you have received this
transmission in error, please immediately reply to the sender and delete
this information from your system. Use, dissemination, distribution, or
reproduction of this transmission by unintended recipients is not
authorized and may be unlawful.
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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
-----------------------------------------------------
|
