Don
        A number that was seen on this forum at one time was 30 grams of
component mass per 1 square inch of total pad area.  I have used this on
some oscillators and it was OK.

Joe Hurst, CET
PWB Designer
Computing Devices Canada
A General Dynamics Company
[log in to unmask]
613-596-7816


-----Original Message-----
From: Steffen, Don E [mailto:[log in to unmask]]
Sent: Friday, September 17, 1999 11:35 AM
To: [log in to unmask]
Subject: [TN] Bottom Side reflow.


Technetters

We are doing a double side reflow. What is the formula to determine the
maximum component mass double side reflow so the components will not fall
off during reflow. I realize it is also necessary to know the amount a
surface tension also necessary. Is there a point, such as 14 pin or less IC
that I can safely process through the reflow. What is the experience of the
industry? I appreciate any responses you can provide!

Donn E Steffen
Senior Quality Engineer
VDO Control Systems
Auburn, IN 46706
Phone (219)925-8887
Fax (219)925-8710
Email: [log in to unmask]

##############################################################
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 Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################

##############################################################
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 Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################