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July 1998

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Subject:
From:
Smith Russell MSM LAPO US <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 23 Jul 1998 05:29:00 +0200
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A 3%-7% solution of HCl works good, Watch Citric, It can be difficult to
rinse and forms Copper citrate crystals fairly easily.
As for titrating a weak acid , use .01 n NaOH , take 1 ml of solution
dilute to 50ml . titrate to ph 7 it should take about 10 ml of reagent ,
if not vary the ratio of working bath to water . KOH will also work in
much the same way

 ----------
From: WHATEVER
To: [log in to unmask]
Subject: [TN] Acid stoper in developing
Date: Wednesday, July 22, 1998 5:31AM

I wonder how many of you using acid stoper during developing of dry
film?
say citric acid. and I would like to hear your comments. For those
chemists
out there, I like to know whether it is really possible to titrate a
weak
acid with three Ka ?


Oh, by the way, anyone using resist lamintor with two sets of rollers,
hot
to hot; Like to try or modify a one, if you have some information, would
you
please share  with me?

Thanks.

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