Tetra-etch is a brand name for a sodium napthalene process, this is classed as a hazardous process here in sunny England and we had trouble getting subbies to use it (they all refused). An excellent alternative was suggested by our supplier, namely Sodium Ammonia etch, this has been evaluated by us and compares very favourably with the previous Tetra-etch results.
We are using it to etch PCTFE prior to bonding a membrane to the component. Once etched the component needs to be shielded from UV as this degrades the etch over time.
If you require any more info drop me a line.


Regards
Ian Squires
Senior Production Engineer
-------------------------------------------------------

Graseby Dynamics Ltd
A Smiths Industries Company
Park Avenue, Bushey, Watford, Herts, WD2 2BW
Web Site: www.gradyn.co.uk
Phone:    01923-228566 xt 295
Fax:      01923-221361
E-mail:   [log in to unmask]

Registered in England no. 480992
Registered office:
765 Finchley Road, London, NW11 8DS
-------------------------------------------------------

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################