HOME > Chowhound > Cookware >

Question regarding ceramic knives

Zander Jan 29, 2008 10:17 AM

The Kyocera ceramic black blades claim to be made of an industrial-type ceramic, the hardest substance known to man except for diamonds.

My questions is - will these knives shatter if dropped? I had a white cermaic knife and loved it. Unfortunately, I dropped it on the floor and it shattered.

Granted the white was less expensive than the black. If the black doesn't shatter, then it's worth the price.


  1. Click to Upload a photo (10 MB limit)
  1. r
    renov8r RE: Zander Jan 29, 2008 10:27 AM

    Reports vary as to the "impact resistence" of the hot-pressed isostatic ceramic. I have not purchased one, but I have seen these fall from counter height and they did not shatter. Still not sure if it is worth as much as they charge.

    1. t
      ThreeGigs RE: Zander Jan 29, 2008 11:12 AM

      The black Kyoceras are a bit tougher than the white, but still made of the same material (zirconium), and will break if dropped on a hard surface.

      5 Replies
      1. re: ThreeGigs
        C. Hamster RE: ThreeGigs Jan 29, 2008 05:16 PM

        Yes. It will shatter if dropped. But it will probably be less susceptible to the nicks and gouges that the white blade can suffer from.

        1. re: C. Hamster
          renov8r RE: C. Hamster Jan 30, 2008 08:40 AM

          Have you seen this happen? I have not. It might be one of those things like the high school cafeteria tumblers -- they bounce if accidentally dropped but shatter if the spin is right, but I've not seen/heard of the hot isostatic pressed Kyocera actually shattering.

          1. re: renov8r
            C. Hamster RE: renov8r Jan 30, 2008 09:30 AM

            I didn't see it, but my mother chipped hers a lot and then dropped it and it broke into pieces. I suppose that isn't "shattering," though.

            I'll stand corrected and just say that they'll break. :)

            1. re: C. Hamster
              renov8r RE: C. Hamster Jan 30, 2008 04:54 PM

              Mom's was the white? Or did she have the problem with the black hot isostatic pressed blades. I believe the "most affordable" of these is still over $100 for a paring knife; I'd prefer a chef's knife which is closer to $300.

              Not doubting, just trying to help clarify -- the knife I saw dropped from counter height was dropped by the owner/manager of a cutlery store. It had no nicks and appeared fine, not sure if the "must fall a certain way" trick applies or not.

              I would think that "break into pieces" would be something that would be covered by their 5 year warranty, in my experience with Kyocera (and most other Japanese companies) that unless there are obvious signs of misuse they will stand behind the product. Not sure that dropping it would be "accidental damage".


              1. re: renov8r
                C. Hamster RE: renov8r Feb 1, 2008 07:37 AM

                Mom's was white. Zabar's had a killer sale for a set of paring and santuko for $65 so I bought one for her and one for me.

                Mine is perfect still but she's a bit hard on her stuff.

                I doubt if dropping it would be covered but I will look into it. Thanks for the link.

      2. p
        Pampatz RE: Zander Jan 30, 2008 12:45 PM

        I have two of the white ones. I lost about 1/16" inch of the point of the chef's knife. DH put is in the wooden knife holder and I think the tip hit bottom and shattered. It's such a small flaw that I haven't gotten it fixed yet. The cleaver-type is used daily and is in perfect condition

        1. HaagenDazs RE: Zander Jan 30, 2008 02:14 PM

          You have to remember what hardness truly means in the scientific sense. The measure of hardness is it's ability... for lack of a better definition, to scratch something. A diamond is "hard" meaning that just about nothing else in the world can scratch it other than another diamond. So 'brittle' and 'hard' are really completely different things. In other words, if I were you, I would not take your wife's diamond ring and smack it with a hammer!

          Show Hidden Posts