In case you are still interested in black wax, the following is supposed to
be a good substitute for TCE.  I undestand TCE (and TCA) are not considered
evironmentally friendly these days.  The commercial name is "HyperSolve".
 I understand it is n-propyl bromide (1-bromopropane) with some secret
additive.  Here's one contact for it.

Grant Moskowitz
Aviation and Defense Team Leader
Phone: 619-269-8930
Fax: 619-269-8932
4843 Voltaire Street, Suite A
San Diego, CA 92107
email: gmoskowitz@ecolink.com
Visit our new web site: www.ecolink.com

PS: I'm going to look into the Enthone OMI "stop-off Number 1".

-----Original Message-----
From:   Karl Cazzini [SMTP:karlcazzini@rcn.com]
Sent:   Tuesday, February 26, 2002 10:38 AM
To:     mems-talk@memsnet.org
Subject:        Re: [mems-talk] black wax

A much better masking material Enthone OMI "stop-off Number 1". This
material is a green paint on polymeric compound which dries quickly and is
completley resistant to acids and bases. It is EASILY removed, and simply
peels off like a rubber sheet - no residuals. I have used the Apiezon
"Black Wax" material, but not with the same degree of satisfaction
(especially upon removal - it leaves residuals).

K. Cazzini (Ph.D)
Senior Scientist
Alcon Research Ltd.
>
> From: "ABHIJAT GOYAL" 
> Date: 2002/02/25 Mon PM 10:12:59 EST
> To: mems-talk@memsnet.org
> Subject: [mems-talk] black wax
>
> Hi,
>
>  can you please suggest me some vendors for Black Wax as a mask for KOH
etch.
> Can you please tell me the vendors that are based in US only, since it
will be
> difficult for me to procure my order if they are outside the US.
>
>   Also can you please suggest me something by which I can remove black
wax after I have etched.
>
> Thanks in advance,
>
> Abhijat Goyal
>
>
> Abhijat Goyal
> EE MEMS group,
> MS candidate,
> Dept. Of Electrical Engineering,
> State College, PA
>
> Ph: (R)814-2350917
>     (O)814-8653664
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