All in the Ammonia/Cupric etchant camp,

Having just returned from a trip outside the US, my apologies for adding to
this topic late.

From a logical standpoint, when designing an etch line, it is best to use
the etchant that gives the best quality etch results at the lowest cost,
which would be zero-free-acid cupric chloride, and then have the etcher
length you need to get the speed you want.

Since an etcher typically lasts 5-7 years, adding length to get more speed
makes sense when you amortize the cost over that time. Since you purchase
chemistry and live with the quality issues on a daily basis, it makes the
most sense to go with the highest quality and lowest running cost etchant.

Best regards,

Phil Culpovich
Oxford V.U.E., Inc.
mailto:[log in to unmask]


-----Original Message-----

Date:    Fri, 10 Sep 1999 13:06:30 +0100
From:    Jim Douglas <[log in to unmask]>
Subject: Re: Ammoniacal vs Cupric chloride Etcher.

Albert

Herewith contact for Cuprammonium Sulphate

ELO-CHEM Recycling Anlagenbau GmbH
Lippertreuter Str. 7
D-88682 Salem-Rickenbach

tel: +49 7553 7051 / Fax: +497553 7052

email 1 [log in to unmask]
email 2 [log in to unmask]

Contact Christian Bernauer

 Note that Rudy has different experiences to our own.
However it all depends on solution conditions and etch machine etc.
Our process etches faster than ammonium chloride with better undercut.

Jim Douglas
----------
From:   Albert Mok[SMTP:[log in to unmask]]
Reply To:       TechNet E-Mail Forum.
Sent:   10 September 1999 03:06
To:     [log in to unmask]
Subject:        Re: [TN] Ammoniacal vs Cupric chloride Etcher.

Dear Jim,

I am interested to know where and how we can acquire the information for
ammonium sulphate etching system is etching faster than that of ammonium
chloride.



>
>Jim Douglas
>Kam Circuits
>
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