TECHNET Archives

July 1997

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Condense Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Mime-Version:
1.0
Content-Type:
text/plain; charset="us-ascii"
Old-Return-Path:
Date:
Thu, 10 Jul 1997 08:29:45 -0400 (EDT)
Precedence:
list
Resent-From:
Resent-Sender:
TechNet-request [log in to unmask]
X-Status:
Status:
O
X-Mailing-List:
<[log in to unmask]> archive/latest/13891
X-Sender:
TO:
Return-Path:
<TechNet-request>
X-Loop:
Received:
by ipc.org (Smail3.1.28.1 #2) id m0wmIDR-000BjhC; Thu, 10 Jul 97 07:20 CDT
Resent-Message-ID:
<"aZwl72.0.3V8.eEDnp"@ipc>
Subject:
From:
Sheila Smith <[log in to unmask]>
From [log in to unmask] Thu Jul 10 08:
50:57 1997
>From willli Thu Jul 10 07:
21:12 1997
X-Mailer:
Windows Eudora Pro Version 2.1.2
Message-Id:
Parts/Attachments:
text/plain (68 lines)
Rudy, You are SO right !!  As we all discover at some point in our lives,
"you really do get what you pay for" ....  I'm having a difficult time
trying to justify to Purchasing that just becuase a laminate manufacturer or
(worse yet) distributor says his material meets say Mil-S-13949/4, that
doesn't mean we can indiscriminately "drop" it into out processing line and
not expect anything to change!!  


At 10:54 PM 7/9/97 -0400, you wrote:
>In a message dated 97-07-09 05:27:25 EDT, you write:
>
>>Having seen lots of SIR data from OTHER facilities, the problem could be a
>>fault in the tester, or technique.  Did good old Bob retire around that
>time?
>> Did water quality in the rinse system change?  Did the DI water unit
>>suddenly go south?  There are lots of factors that can cause poor SIR.
> Don't
>>assume any one factor is the problem.  
>
>Sir Doctor Guru of SIR
>
>You run two pieces of laminate, one from vendor A, the other from vendor B,
>through the same process, and one passes easily, the other fails miserably,
>and you repeat this test, with 100% reproducability.... if you can make
>another deduction from this data, TechNet is awaiting your assessment....:-)
>>
>>I do agree that no two laminates are the same.  Varying levels of porosity
>>and varying resin compositions can dramatically effect SIR, or at least
>their
>>processing characteristics.
>>
>Sir Doctor:
>
>Most of the poor, overstressed PCB fabricators have only their vendors to
>(pick one) 1. turn to for assistance  2. blame, and having been in both
>positions more than once, it is clear to me that we all need to see what the
>options are.   I for one, and suspect many others, never considered that
>laminate could vary to this extent.   This was a great learning experience
>for me, and I was hoping to spread the benefits....
>
>Yours in science, and PCB fabrication:
>
>Rudy Sedlak
>RD Chemical
>
>***************************************************************************
>* 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]      *
>***************************************************************************
>
>

***************************************************************************
* 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]      *
***************************************************************************


ATOM RSS1 RSS2