I don't know of any services that do that but you could always dice
them into smaller pieces (4"x4") and then mount them on dummy wafers
(which I think will be significantly cheaper than having your wafers trimmed).

Nicolas Duarte
PhD Candidate at Penn State under Dr. Srinivas Tadigadapa

At 11:53 AM 6/12/2007, you wrote:
>Dear All,
>
>I need to urgently reduce the size of my 8 and 6 inch wafers into 4 inch
>ones. Could you please let me know if any such services (mechanical or
>laser-based wafer cutting) are offered (/available) in Europe ? I guess
>wafer edge trimming might also be necessary.