Patent ID: 7004823

Claim:
A treating sheet for preparation of a materialographic sample or a set of materialographic samples, said sheet being substantially circular and having a back side and a face side, said face side comprising at least two annular treating zones, between said at least two treating zones said face side comprises intermediate annular distancing zones, each of said treating zones having a grinding or polishing surface, each distancing zone creating an annular channel between juxtaposed treating zones, wherein the entire radial width of each of said treating zones provides a contact surface, said treating zones have a width between 10 and 100 mm and wherein at least one of the annular channels between said treating zones has a depth measured from a lowest point of the channel to a plane defined by an upper surface of an adjacent treating zone, the adjacent treating zone lying next to the channel and closer to the center of the sheet than the channel between 0.1 and 3 mm.