MEMS-talk: What is the recommended process method to produce a 50 +/- 5 micron through hole in a 1mm thick Pyrex wafer? Dimensional tolerances and repeatability are important to our design. -- Patrick Roman, M.S. Microsystems Engineer Code 553- Detector Systems Branch Room E042 Building 11 NASA/ Goddard Space Flight Center Greenbelt,MD 20771 phone: (301) 286-3558 fax: (301) 286-1672 mobile: (202) 294-8602 email: proman@pop500.gsfc.nasa.gov