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: white residues after cleaning
From:	Hans Shin <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Tue, 1 May 2001 09:36:50 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (37 lines)

Doug is correct...wouldn't necessarily want to use Specular Reflectance, which is useful for measuring surface coatings on reflective substrates (also useful for grazing angle analysis).  Actually, you can use specular reflectance if you just simply take a small portion of the residue and put it on a reflective substrate.  A more common approach would be to use an ATR (Attenuated Total Reflection) accessory on a FTIR microscope.

HPLC, Ion Chromatography...takes a bit more time...and uses standards...but nevertheless, good tools...unless it's an inorganic oxide of some sort.

Hans Shin
Pacific Testing Laboratories, Inc.


-----Original Message-----
From:   Douglas Pauls [SMTP:[log in to unmask]]
Sent:   Tuesday, May 01, 2001 9:02 AM
To:     [log in to unmask]
Subject:        Re: [TN] white residues after cleaning

What tests can you do?  Ion chromatography is one.  HPLC is is pretty good
for identifying residual rosin elements.  You might try a surface
reflectance FT-IR, but that signal can be confused with what you get from
the laminate.  These tests can be run on small samples.  I would not
recommend SEM-EDX.  Wrong tool for this residue.

In terms of who can do such testing for you in Europe, I would suggest
trying NPL in the United Kingdom (Chris Hunt or Alan Brewin) or IVF in
Sweden (Per-Erik Tegehall).

Doug Pauls
Rockwell Collins

---------------------------------------------------------------------------------
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