Text item: 

     Anybody,
     
     Any ideas if i had stored the paste at either -20C or at 20C for a 
     minimum of 1 month?
     
     Thanks,
     Siegfried


______________________________ Reply Separator _________________________________
Subject: Re: ASSY: Solderpaste storage
Author:  [log in to unmask] at SMTPGATE
Date:    4/15/97 12:09 PM


Siegfried,
     
I've used Kester 244 (RMA) quite extensively and find it to be a very 
forgiving paste with wide process windows, and very easy to clean.  At 10 
deg C for an unopened container, I suspect you would have no problem with a 
storage time of 6 months from date of manufacture, after that I'd start 
doing solderability tests depending on your specific requirements (or just 
watch your results carefully).  I've had some at 5 deg C. for over a year 
and still have seen no performance loss.
     
As far as the -10 deg C, I don't have any input, perhaps others do.  I'd be 
interested in knowing that also.  I suspect there would be no problem as 
long as the paste is allowed to warm to room temperature before being 
expose to air (and resulting condensation).
     
Larry Morse
Celwave RF
[log in to unmask]
     
     
     
     
 -From:        Siegfried Quemado <[log in to unmask]>
Subject:     ASSY: Solderpaste storage 
Date:        Tue, 15 Apr 97 09:39:00 PDT
     
--------------------------------------------------------------------------- 
We're currently using Kester R244 and if anybody out there has used this 
paste, please share with me your experience with this paste and how it 
performs when it has been stored at relatively "extreme" temperatures,
such as -20C and 10C. We are currently storing ours at 4C and we would 
like to determine what our storage tolerances should be. We are looking 
at a window between -10C and 10C.
     
Also, has anybody used this paste after it has been stored at around 8 
hours at approximately dry ice temperature? What do you suppose would 
happen after paste stored at this cold temperature is reflowed?
     
Regards,
Siegfried Quemado
[log in to unmask]
     
*************************************************************************** 
* TechNet mail list is provided as a service by IPC using SmartList v3.05 * 
*************************************************************************** 
* To subscribe/unsubscribe send a message <to: [log in to unmask]>   * 
* with <subject: subscribe/unsubscribe> and no text in the body.          * 
*************************************************************************** 
* If you are having a problem with the IPC TechNet forum please contact   * 
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      * 
***************************************************************************

Text item: External Message Header

The following mail header is for administrative use
and may be ignored unless there are problems.

***IF THERE ARE PROBLEMS SAVE THESE HEADERS***.

Resent-Sender: [log in to unmask]
Precedence: list
X-Loop: [log in to unmask]
X-Mailing-List: <[log in to unmask]> archive/latest/11990
Resent-From: [log in to unmask]
Resent-Message-ID: <"ID1TL2.0.tEA.5szKp"@ipc>
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=US-ASCII
Mime-Version: 1.0
Organization: Unregistered version of SpikeMail
X-Mailer: SpikeMail 3.10
To: [log in to unmask]
Subject: Re: ASSY: Solderpaste storage
From: "Larry Morse" <[log in to unmask]>
Date: Tue, 15 Apr 1997 12:09:23 -0800
Message-Id: <[log in to unmask]>
Old-Return-Path: <[log in to unmask]>
Resent-Sender: [log in to unmask]
Received: by ipc.org (Smail3.1.28.1 #2)
     id m0wHELk-000BlnC; Tue, 15 Apr 97 14:57 CDT
Resent-Date: Tue, 15 Apr 1997 17:28:42 -0700
Received: from ipc.org by simon.ipc.org via SMTP (940816.SGI.8.6.9/940406.SGI)
      id RAA17625; Tue, 15 Apr 1997 17:28:42 -0700
Received: from simon.ipc.org ([168.113.24.64])
          by ormail.intel.com (8.8.4/8.8.4) with SMTP
       id PAA29733 for <[log in to unmask]>; Tue, 15 Apr 1997 1
5:47:00 -0700 (PDT)
Received: from ormail.intel.com by relay.hf.intel.com with smtp
     (Smail3.1.28.1 #2) id m0wHH23-000qDNC; Tue, 15 Apr 97 15:48 PDT

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To subscribe/unsubscribe send a message <to: [log in to unmask]>   *
* with <subject: subscribe/unsubscribe> and no text in the body.          *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************