The prefix "DUP" indicates a specific series within Naniwa’s industrial catalog. Unlike the consumer-grade "Chosera" or "Super Stone" lines, the DUP series was historically designed for . These stones utilize a unique binding resin that holds sharp, monocrystalline alumina particles. The "DUP" signifies a stone intended for high-pressure, high-heat applications where standard water stones would crumble.
Cutting and Finishing
Because this is an "E 18" (Extra Hard) stone, flattening it requires diamond plates. (like a Norton Flattening Stone) as the hardness mismatch will cause the DUP 09 to tear chunks out of the SiC stone, glazing both. naniwa dup 09 ccd e 18 hot