Review – Haidu Ceramic Sharpening Stones

I recently received 3 sharpening stones for review from Attila at Haidu Ceramics.  These are Silicone Carbide stones that come in several sizes, which are indicated by either HCA  (230x65x20mm) , HCB (170x60x20mm) , or HCC (100x35x10mm).

These stones are rated with the FEPA grit rating at F180 (JiS 180), F280 (JiS 360), F600 (JiS 1200) and F1,000 (JiS 2600). The F1,000 comes in a Medium (M) and Hard (H) formulation. I received the F280, F600, and F1,00o M grit stones.

Haidu Ceramic Sharpening Stones

Since these stones were making their rounds for reviews from others, they were clearly used, and were slightly dished and uneven. So the first thing I did was lap them. I used the Atoma #140 diamond plate. Lapping the 280 was pretty straight forward – it is solid, but not nearly as hard as Spyderco Ceramic stones (which is good news!). The 600 was more difficult to lap due to it being more dense, and the 1K was about the same, if not just a little bit easier. Overall, lapping them is not impossible, but it is clear that they will keep their flatness well over time. I’d highly recommend not letting them get too far out of flat, though.

On to the sharpening 🙂 These stones are porous, so I gave them a good soak in the bucket for about 30 minutes since they were completely dried out. The bubbles were fine – like champagne. Once they were good and soaked, they only needed a spritz before using. I first started on a Maestro Wu D-4 Veggie Cleaver, which is carbon steel at around RC 57-58.

The 280 did not seem as coarse as it is advertised (JiS 360), but more like a JiS 1,ooo. The stone worked better with a more roughly textured surface, and there seemed to be more burnishing effects than cutting effects with this particular knife, although there is cutting action. On the 600, the action was smoother, and had more positive feedback that reflects the JiS 1200 rating, and left a very good, smooth working edge. The 1K reacted best with this knife – there was still some nice feedback with cutting action, and the polishing effects were more desired. The edge after the 1K was improved over the 600.

The next knife was a cheapo stainless steel paring knife in desperate need of sharpening, which I’d say is RC 50-52. The 280 stone really came to life, with aggressive action that easily reprofiled the very blunt edge. The 600 put a very nice working edge, with there being no real difference on the 1K – this is a characteristic of the softer steels, not of the stone.


I would rate the Haidu Ceramic stones as very good mid-range/ mid-price stones that are very well suited for routine maintenance and minor repair. Their hardness will resist gouging and stay relatively flat over time. The burnishing effects on the lower grit did help “increase” the overall grit of the edge, which is good if you want to finish on the 280, but has the opposite effect if you need to do repair work – but keep in mind that I didn’t try the F180, which should be the most aggressive stone.

I’d like to thank Attila from Haidu Ceramics for the opportunity to try these stones out!


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