Have you looked at a peelable masking.  This will stand-up to cupric and
is fairly easy to apply.  We use an SD 2954.



Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com
 

-----Original Message-----
From: Brummer Chuck [mailto:[log in to unmask]] 
Sent: Tuesday, February 01, 2005 2:06 PM
To: [log in to unmask]
Subject: [TN] Peel able Etch Block

Hi Everyone,

I need to protect the backside of a flexible circuit where the copper is
exposed through the Polyimide through our cupric etcher.  The opening is
to
deep for dry film and if I use liquid resist that thick I cannot get it
to
strip.

Does anyone know of a "peel able" etch resist that might work for this
application?

Suppliers or vendors are welcome to contact me directly

Thanks in advance,

Chuck Brummer
Siemens Medical
[log in to unmask]
818.734.4930

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