All, I don't mean to spam this group, but, we have a fab that speciallizes on dielectric isolation on 4" Si wafers. We can offer services that many MEMS designers/manufacturers are asking for, i.e. moat etch, oxidation, thick polysilicon (700+um) and grind/polish with +- 2 um thickness control, sub-micron TTV's and angstrom Ra's. No job too large or small. Feel free to email or give me a call. Thanks, Jim Girouard THAT Corporation 508-478-9200 x 129 jjg@thatcorp.com