Figure 6.15 shows the relationship of glass BK6 with polishing time, stock removal, and polisher wear amount, lapped to a matte surface, and polished with CeO2 powders and an acrylic resin pad (polisher). In the early stage of polishing, the work surface still remains rough, producing small stock removals and large degrees of polisher wear. However, once a mirror-like surface is obtained, stock removal increases significantly in proportion to the polishing time. On the other hand, pad (polisher) wear turns out to be small, which also increases in proportion to the polishing time [19].