What is oxide ceramic?
Oxide ceramic is aluminum oxide sintered at high temperatures. Natural occurrences: corundum, sapphire, ruby. These natural minerals consist of 99% aluminum oxide. Alumina is naturally colorless. The slightest admixtures of chromium oxide cause red tones ("sinter ruby"), the addition of cobalt oxide creates our blue grains ("sinter sapphire"). In the medical-technical application area (prosthetics), colorless / white mixtures are preferred because they are absolutely bioneutral. Colorless oxide ceramics are also used in high-performance machine construction.
Why do we use oxide ceramics?
... for sharpening knives?
Oxide ceramics are harder than steel!
Rub a hard object against a switch. The softer material wears out, the hard material remains intact. Since this "ceramic" is much harder than steel, it is ideal for sharpening European and even the harder Japanese steel knives.
... for nail and foot care?
Oxide ceramics are durable, have a closed surface, are bioneutral and can be disinfected. It maintains the care properties without wearing out. Would you still want to take care of your feet with a 10 year old metal rasp