D09 / E18 Reference Grit: #180 (Coarse)
. In some industrial systems, "E" followed by a number indicates the specific micron size or mesh count of the abrasive particles. : Likely refers to the manufacturing process, specifically Hot-Pressing
For context, here is how the Naniwa DUP 09 CCD E 18 Hot stacks up against modern alternatives in the same price range ($120–$180 USD for a used unit). naniwa dup 09 ccd e 18 hot
The "E 18" suffix is the binding density. "E" stands for "Extra Hard." The number 18 refers to the percentage of binder volume relative to abrasive. An "E 18" stone is extremely dense. It releases abrasive very slowly, which explains why these stones last for decades. However, this hardness also means the stone —it is a splash-and-go stone. If you soak an "E 18" stone, it will become brittle and crack.
Systems adhering to the parameters are critical to environments where precision must coexist with harsh physical conditions. D09 / E18 Reference Grit: #180 (Coarse)
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The "Hot" press construction allows for aggressive grinding of hard surfaces like concrete or stone. The "E 18" suffix is the binding density
Given the difficulty in finding direct results, perhaps the keyword is from a specific platform like "Taobao". I'll search for "naniwa dup" on Taobao..