TECHNET Archives

October 2005

TechNet@IPC.ORG

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 >>]

Print Reply
Subject:
From:
Kevin Glidden <[log in to unmask]>
Reply To:
Date:
Mon, 3 Oct 2005 13:41:18 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (104 lines)
 
Ah yes, I forgot that part ....IPC-A-610 / J-STD-001 Class 3 MIL/AERO. 
These boards are used in logic and / or power supply for aircraft lighting
(wing-tip, flood, runway, etc).

One of my first initiatives in my new position will be to perform the
required SIR / IC testing to support
use of the water soluble for Class 3 product.  I was just curious on the
concern of mixing flux types.

Hoping to hear from Mr Pauls...


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David Tremmel
Sent: Monday, October 03, 2005 1:32 PM
To: [log in to unmask]
Subject: Re: [TN] Mixing Fluxes: Water Sol and Rosin

Kevin,

That depends on the class product you are building/repairing and what kind
of environment your boards are used in.

I have used water-soluble flux and then a rosin or no-clean flux afterwards
for touch-up work and it really comes down to cleanliness.  If the
water-soluble flux residue is removed thoroughly, then it should not be a
problem using a different flux for touch up, but as it has been said, it
depends (sorry for any copyright infringement).

What I recommend is do your own tests.  Examine any field failures which
have been previously reworked and look for any corrosion or residues in the
reworked areas.  Although the reworked area may appear to be clean (using a
microscope), sometimes any undesired residues are not seen until a unit has
been in the field for a while.


The gurus with the chemical degrees and the millenia of experience can
probably explain it better.

Ramon, you're a sharp cookie with a lot of experience, care to chime in?

David


>From: Kevin <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              Kevin
><[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] Mixing Fluxes: Water Sol and Rosin
>Date: Mon, 3 Oct 2005 11:34:53 -0500
>
>Is it acceptable to mix flux types on a single piece of hardware?  I 
>have background in MIL/AERO requirements of the "rosin only" creedo.  
>My past experience is with rosin types only, to avoid all the emotional 
>customer issues and testing requirements.  However, I am now working 
>for a company and their SOPs dictate use of WS at first solder, 
>followed by water clean.  They then dictate rosin for any touchup, with 
>hand clean only.  Is there a risk in mixing water sol and rosin on a single
piece of hardware?
>What about resin and rosin?
>
>---------------------------------------------------
>Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 
>or (re-start) delivery of Technet send e-mail to
>[log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing 
>per day of all the posts: send e-mail to
>[log in to unmask]: SET Technet Digest
>Search the archives of previous posts at: 
>http://listserv.ipc.org/archives Please visit IPC web site 
>http://www.ipc.org/contentpage.asp?Pageid=4.3.16
>for additional information, or contact Keach Sasamori at [log in to unmask] 
>or 847-615-7100 ext.2815
>-----------------------------------------------------

_________________________________________________________________
¿Cuánto vale tu auto? Tips para mantener tu carro. ¡De todo en MSN Latino
Autos! http://latino.msn.com/autos/

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet
NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send
e-mail to [log in to unmask]: SET Technet Digest Search the archives of
previous posts at: http://listserv.ipc.org/archives Please visit IPC web
site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2