Hi Le,

You'll have to measure the Tg after the treatment. Tg of the material
can be measured using Differential Scanning Calorimetry (DSC) or
by TGA (Thermogravimetric analysis).

As long as the temperature is well below the Tg of the material its
OK. However it is good to check and see what the effects of the heat
treatment process is.

Regards,

Adil
(Used to be a lamination engineer-polyiimide and FR-4)


>From: Le Dai Tri <[log in to unmask]>
>Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>,        Le Dai Tri
><[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] Procedure for Tg measuring
>Date: Mon, 14 Aug 2000 16:39:40 +0700
>
>TechNeter,
>
>We purchase Prepreg in roll then cut into suitable worksize, before
>sending prepreg to Laminating process we have IR heating process:
>Maximum heating temperature was 115 deg.C (FR-4).
>
>1. Can anyone have any experiences about this treament ? it is effect
>     or not ? Does it effect Tg of Prepreg material?
>
>2. Can I measure Tg by ourselves ? I want to confirm Tg before and
>     after IR treatment. If posible please show me where I can get
>     procedure.
>
>Any help would be appreciated.
>
>Best regards,
>Tri'.
>_______________________________________
>E-Mail    : [log in to unmask]
>

_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.

Share information about yourself, create your own public profile at
http://profiles.msn.com.

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d
##############################################################
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
##############################################################