Kris, Transene Company offers epoxy resins which would meet your needs. We also offer TMAH as well as proprietary isotropic and anisotropic silicon etchants. Our products may be viewed at www.transene.com. Feel free to contact me if you would like to discuss your application further. Christopher Christuk Transene Company 10 Electronics Avenue Danvers MA 01923 Tel: 978 777 7860 Fax: 978 739 5640 Email: Christopher@transene.com -----Original Message----- From: kris [mailto:crikxo@yahoo.com] Sent: Thursday, July 10, 2003 2:21 PM To: General MEMS discussion Subject: [mems-talk] Protection of backside of chips in TMAH Dear all, I am trying to etch si in TMAH solution.I have very small chips(not wafer) to be etched.As we need to have mild stirring for the etchant solution,i was wondering how to place my chips in the etchant solution. Is there anyway that i can etch small chips in TMAH solution.I want to know if there is any vendor who can supply me epoxy so that i can attach my chips to any glass substrate and cure them which also protects the backside of the chips.I need epoxy that should not change PH of the solution as the etch process is highly sensitive to the change in PH values. Your suggestions would be highly grateful. Thanks Kris __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com