You might look at
http://www.ammt.de/html/wet_etching.html
They manufacture a holder from PEEK and can do backside window or
illumination. I'm sure there are others.
>Hi,
>Does any one know where I can get backside protection sample holder for
>KOH wet etching.
Information provided for example only; not an endorsement by NIST.
--
- Jim Beall 303-497-5989
beall@boulder.nist.gov