Tech Spray make Wondermask P and Wondermask PL - the former is synthetic
latex, non-ammoniated, the latter is natural latex and contains ammonia.
Peter
--
=========================================================
Peter Swanson [log in to unmask]
INTERTRONICS http://www.intertronics.co.uk
INTERTRONICS is dedicated to providing quality material,
consumable and equipment solutions to the electronics
manufacturing and other technology based industries, with
the highest levels of technical support and customer
service.
-----Original Message-----
From: Hans Hinners [mailto:[log in to unmask]]
Sent: 17 January 2001 19:43
To: [log in to unmask]
Subject: Re: [TN] Special through hole pad design
Hi Phil, Ken and All,
Does that Techspray Wondermask have ammonia in it? I had to eliminate
that
from my ancient Hollis waveflow process as a possible cause of over
oxidation. Something I learned from the list in fact.
Hans
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Process Engineer
Toppan Electronics, Inc.
770 Miramar Road
San Diego, CA 92126
(858) 695 - 2222 ext. 241
(858) 695 - 6823 fax
[log in to unmask]
-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]]
Sent: Wednesday, January 17, 2001 5:21 AM
To: [log in to unmask]
Subject: Re: [TN] Special through hole pad design
We use two methods.
1) peelable solder mask Techspray Wondermask P
2) holes with no plating through and about a 10 mil ring of no copper on
the
inside diameter of the land.
-----Original Message-----
From: Ken Fong [mailto:[log in to unmask]]
Sent: Wednesday, January 17, 2001 12:48 AM
To: [log in to unmask]
Subject: [TN] Special through hole pad design
Technetters,
Could anyone advise a design of soldering pad which will not be closed
with
solder during wavesoldering when the hole is not inserted with
component,
but it
can form a normal solder joint when a component is inserted through the
hole
with the lead clinched by auto-insertion machine? The board is 1.6mm
thick
single sided pcb. Thanks.
Ken
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