1. Sort of. (from brittle to "rubbery", never really becomes a liquid before
decomposing)

2. Higher operating temp.

3. Yes.

Bob Dube

-----Original Message-----
From: Hiteshew, Michael <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Wednesday, July 12, 2000 12:11 PM
Subject: [TN] Glass Transition Temperature (Tg) Questions


Hi,
        I've been reading up on laminate materials and have some questions
that I hope some-one can help me with:

1. What is the "glass transition" ? What is the glass transitioning from and
to? I'm guessing it's the plastic stage that occurs in a material just
before it melts.

2. What is gained by a higher Tg in tetrafunctional and multifunctional
epoxy-glass?

3. What is meant by the prefixes "tetra" and "multi" as they're applied
here? Is it a reference to the number on bonds in the chemical structure of
the epoxy or glass?

Thanks in advance,

Michael Hiteshew
Lockheed Martin NE&SS-Baltimore
[log in to unmask]
(410) 682-1259

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - 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 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################