... order to improve its purity. Among the 9 products, DP IV is made by mono-crystal nanometer diamond and ... DP V is poly-crystal nanometer diamond. Using DP IV can minimize a surface roughness ... 9.3, to only 0.1~0.3nm. And DP W1.0 can reduce its Ra from 80.0nm to ... ZrO2,BK7 glsss. TYPE: DP W1.5, DP W1.25, DP W1.0, DP W0.75, DP I, DP II, DP III, DP IV, DP V. VOL: 0.25L ...