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以往的试验工作表明，脆的具有马赛克结构的金刚石ＰＤＡ３２１效果最好。此后，又有了更脆的具有马赛克结构的磨料ＰＤＡ２１１。图１６所示为树脂粘结的粒状磨料ＰＤＡ６５７ Ｎ５５、马赛克结构磨料ＰＤＡ３２１ Ｎ５５以及新型树脂粘结磨料ＰＤＡ２１１ Ｎ５５的试验结果。
Previous experimental work shows that the brittle diamond PDA321 with the mosaic structure works best. Since then, there have been more brittle with a mosaic structure of the abrasive PDA211. Figure 16 shows the results of a test on a resin-bonded particulate abrasive PDA657 N55, a mosaic structural abrasive PDA321 N55 and a new resin-bonded abrasive PDA211 N55.