LISTSERV - TECHNET Archives - LISTSERV.IPC.ORG

TECHNET Archives

May 2001

TechNet@IPC.ORG

	LISTSERV Archives
	TECHNET Home
	TECHNET May 2001

	Log In
	Register

	Subscribe or Unsubscribe

	Search Archives

Options:	Use Monospaced Font Show Text Part by Default Show All Mail Headers
Message:	[<< First] [< Prev] [Next >] [Last >>]
Topic:	[<< First] [< Prev] [Next >] [Last >>]
Author:	[<< First] [< Prev] [Next >] [Last >>]

Subject:	Re: Weight Gain Testing
From:	"d. terstegge" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Wed, 30 May 2001 09:42:05 +0200
Content-Type:	text/plain
Parts/Attachments:	text/plain (54 lines)

Hi Donn,

I once did a study on the effects of several drying methods. We did measurements of weight gain after a stay in a humidity chamber, and after baking. Maximum weight gain depended on board type, and was somewhere between 0.5 and 0.7 %. With a good balance this is very well measurable.
The moisture level that results in delamination was somthing we took over from existing literature, I think 0.4 % was used as a rule of thumb.
By the way, for daily operation I don't think it's very pratical do do these kind of tests. You have to make sure that it's exactly the same board that you measure before and after the process you're trying to monitor. 

Kind regards,

Daan Terstegge
Unclassified mail
Personal Website: http://www.smtinfo.net 

>>> "Steffen, Don E" <[log in to unmask]> 05/29 2:58 pm >>>
Technetters

Is there anyone out there in the TechNo world that has performed a
Weight Gain Test. I am deriving a Board Cleaning Spec and the amount of
moisture gain in the printed wiring boards is an attribute that I want
to track in order to minimizing the chances of "Popcorning" internal the
PWB. I do not want any delamination to occur since we are processing
material in multilayer.

Any help you can give me would be appreciated.

Donn E Steffen
Senior Quality Engineer
VDO Control Systems
Ph# 219-920-6052
Fax# 219-925-8710
Cell# 219-417-2926
Pager# 219-430-2826



-----------------------------------------------------------
This Mail has been checked for Viruses
Attention: Encrypted Mails can NOT be checked !

***

Diese Mail wurde auf Viren ueberprueft
Hinweis: Verschluesselte Mails koennen NICHT geprueft werden!
------------------------------------------------------------

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

ATOM RSS1 RSS2

LISTSERV.IPC.ORG