So you're saying not being concerned about exposed fibers could leave a yacht to be desired.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
Sent: Tuesday, June 19, 2007 12:03 PM
To: [log in to unmask]
Subject: [TN] SV: [TN] fibers
Genny,
When you shrub your back against a board with exposed fibers, you may
get disrupted fibers into your skin.
What do the netters say? Will she be angry and disrupt the exposed
fiber on the PC and unplug?
Allright, we have to think then. Very odd question. The FR4 fibers are
from the beginning a woven mat with bundles of glass fibers. All is
surrounded and completely 'molded' in epoxy and cured. The only few
occasions when I've seen exposed fibers have been after(incorrect) board
repair or modifications of boards (machining with various tools). Also,
board edges have sometimes exposed some fibers from bad depaneling. What
I know, noone has been anxious about that, because normal humidity won't
penetrate far into the structure. However, compare with the gelcote on a
sailing boat's hull. If the gelcote is damaged, water can indeed
penetrate along the fibers in a long time scale. A friend of mine did
not care about his boat for many years, the gelcote was scratched after
endless pulling boat from water, across stone and sand to avoid
tidewater. It was a small boat for fishing. After some years he left the
boat in the water for one season, and...when I helped him to get it on
land for repair, it weighted tons. He did not understand. I did. The
glassfiber construction had sucked such a lot of water, that the weight
was about 200 kg extra!
One can't compare a plastic boat to a PWB, but logically, some water may
find its way into a FR4 structure likewise. Water molecules have a
infamous capability to diffuse into various materials, as we all know.
My two ounces
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Genny Gibbard
Skickat: den 19 juni 2007 17:26
Till: [log in to unmask]
Ämne: [TN] fibers
Trying again - would appreciate your knowledgeable responses or direct
me to some info or sources of reading on this:
What are the dangers associated with each of exposed fibers and
disrupted fibers in FR4 laminate?
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 15.0
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 15.0
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
-----------------------------------------------------
|
