Sender: |
|
X-To: |
|
Date: |
Thu, 20 Apr 2006 20:58:52 EDT |
Reply-To: |
|
Subject: |
|
MIME-Version: |
1.0 |
Content-Transfer-Encoding: |
7bit |
Content-Type: |
text/plain; charset="US-ASCII" |
From: |
|
Parts/Attachments: |
|
|
A couple of other things about Tetrahydrofuran.
Exposure to the chemical has been well covered. However, the TLV of
exposure in the US is still high for the properties outlined for Europe. 200 ppm is
pretty high, but my guess is that will be lowered. Anyway, the internet says
a million pounds a year are used in the US.
THF is an excellent solvent, as Rudy has pointed out. I cannot imagine it
will just attack parylene, and not attack the epoxy of the board, solder
mask/marking inks, and potting compounds on your discrete components from the
picture of your module. Some of the other solvents Rudy offered you are either
the stuff for dissolving epoxy so it can be coated on to glass fabric, or the
solvent used in the multilayer PTH line for removing epoxy drill smear.
Finally, THF is pretty flammable. I did not look up ethyl ether, but if
you use it, pretend you are using starter fluid for a gasoline engine.
Denny Fritz
MacDermid, Inc.
---------------------------------------------------
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
-----------------------------------------------------
|
|
|