Naniwa utilizes "DUP" (Diamond Uneven Parallel) technology in this series. Unlike traditional resin-bonded diamond stones that can feel "muddy," this design features diamond particles arranged in specific, uneven parallel lines.
Molding with Naniwa DUP 09 CCD E 18 HOT is not for beginners. The high thermal stability means the material has a wide processing window, but it also presents risks: naniwa dup 09 ccd e 18 hot
Standard water stones often leave a microscopic, foil-edge burr that feels sharp but folds under use. The CCD ceramic chips in the Naniwa DUP 09 create a unique "stochastic" scratch pattern—randomized scratches that prevent a consistent foil burr from forming. Users report that edges finished on this stone hold their sharpness 30% longer than edges finished on a Shapton Glass #1000. The high thermal stability means the material has
Softer stones (like King or generic Norton) struggle with high-vanadium stainless steels (S35VN, VG-10, ZDP-189). The vanadium carbides are harder than the stone matrix, causing the stone to "skate." Because the Naniwa DUP 09 CCD E 18 uses ceramic chips that are harder than vanadium carbide, it cleanly shears carbides rather than plucking them out. This results in a polished, consistent bevel without micro-chipping. Softer stones (like King or generic Norton) struggle