I am also interested in this, particularly for No Clean Flux.
By the way, are any of you MIL/High Reliability folks using no clean?
*** Are any of you NOT using no clean as the result of some testing or
evaluation? ***
Thanks,
Michael Lang
[log in to unmask]
----------
From: TechNet-request
To: technet
Subject: Re:Compatibility of soldermask & flux
Date: Monday, April 28, 1997 9:16AM
Hello Technet...I have a question regarding this discussion:
How can I know if a soldermask is compatible with a flux ? Do the suppliers
of mask / flux have this information ? Or we probably need to do some
tests...What kind of test ?
Thank you in advance
>Resent-Date: Thu, 24 Apr 1997 17:58:30 -0700
>Resent-Sender: [log in to unmask]
>Old-Return-Path: <[log in to unmask]>
>Date: Thu, 24 Apr 97 17:12:46 cst
>From: "ddhillma" <[log in to unmask]>
>Encoding: 52 Text
>To: [log in to unmask]
>Cc: [log in to unmask]
>Subject: Re: Solder bridging after wave solder
>Resent-Message-ID: <"dIt133.0.EbD.gozNp"@ipc>
>Resent-From: [log in to unmask]
>X-Mailing-List: <[log in to unmask]> archive/latest/12234
>X-Loop: [log in to unmask]
>Resent-Sender: [log in to unmask]
>
> Hi Elizabeth -
>
> You might try investigating the compatibility of the soldermask and
> the flux chemistry. I have found that the soldermask texture (i.e.
> either shiny/smooth or matte/rough) and the specific flux interaction
> is very important. The general industry trend is that shiny soldermask
> will have more solderballs/bridging than matte soldermasks but I have
> found that with certain flux chemistries I can use shiny soldermasks
> with no solderball/bridging problems. Good Luck.
>
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
>
>______________________________ Reply Separator
_________________________________
>Subject: Solder bridging after wave solder
>Author: [log in to unmask] at ccmgw1
>Date: 4/23/97 7:19 PM
>
>
>Dear Technet,
>I have a customer who is reporting bridging on the solder side of the board
>after wave soldering. I have seen the boards, and they look quite messy,
>with solder sticking to the mask as well as between component leads and
>pads. The mask itself is adhering nicely. The mask is PC501 from Haven,
>with C101 hardener. This was recently discontinued by MacDermid and picked
>up by Haven. The flux is no clean, ENFLUX NCF-8660, and is under pressure
>with nitrogen. The wave itself is at 500 degrees F, with preheats set to
>get the board to 210 to 220 degrees F when it hits the wave. The same
>design board with LPI ran fine, so I do not suspect a problem in another
>area of the process.
>
>No other customers are reporting this problem, and I am at a loss as to
>where to investigate further. The customer is not happy, and wants a
>resolution today! If anyone has any insights, please let me know.
>
>Thanks,
>Elizabeth Falk
>Process Engineer, Beaverbrook Circuits
>
>***************************************************************************
>* 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] *
>***************************************************************************
>
>
>
--------------------------------------------------
Annie Laberge
--------------------------------------------------
Matrox Electronic Systems (MES)
***************************************************************************
* 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] *
***************************************************************************
|
