P80, P120 and P220 is recommended for flat grinding.

P80 and P120 is generally recommended for flat grinding sample holders, and P220 is recommended for flat grinding single sample holders.

Tip for flat grinding large samples.

Flat grinding very large samples with Piatto is not recommended because of the high forces needed. An alternative to the usual stone grinder is Aka-Allegran-9 with 15 µm DiaMaxx-M.