Frank:
Two more considerations:
UV curable water-soluble (in lieu of waiting 30-60 minutes to cure the
mask)
Water-soluble tape or tape dots for large holes.
Al Kreplick
Sr. Mfg. Eng.
Teradyne, Inc.
North Reading, MA
978-370-1726
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Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
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cc:
Subject: Re: [TN] Water soluble solder mask
Frank: Some things to consider for temporary water soluble solder mask:
1. Method of application: screen print, auto-dispense XY system, hand
application, etc.
Board volume and feature complexity can influence choice of application.
2. Type of material: filled, unfilled, water base, alcohol base etc .
Method of application, type of cure, dissolution rate, type of washing
equipment/chemistry, assembly compatibility SMT-wavesolder-mixed technology
need to be considered for material choice.
3.Board features to be masked: large features, cut-outs, melting metals
etc.
These types of masks usually don't do well over large areas or spanning
cut-outs larger than about 0.300 - 0.400", they can also have a tendency to
flake or crack when used on Sn/Pb when subject to melting temperatures.
4. Applied mask shelflife and storage: masked board storage conditions,
method of storage, hold times prior to use etc.
The humidity, how boards are stored ie wrapped-unwrapped-slip sheets-flat
stacked-edge stacked, hold times greater than three to six months can all
influence the ability of the material to perform correctly.
Michael Barmuta
Staff Engineer
Fluke Corp.
Everett WA
425-446-6076
-----Original Message-----
From: Frank L Norman [mailto:[log in to unmask]]
Sent: Thursday, January 24, 2002 6:22 PM
To: [log in to unmask]
Subject: [TN] Water soluble solder mask
Hi all,
Looking for insight about using water soluble solder mask.
We are currently using a latex solder mask made by Litton. But now the
question as been asked if water soluble mask could be used instead. Note,
batch washer(Aqueous Tech. Washer) is used to clean PWAs.
Frank Norman
Raytheon
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