Akasa
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I don't think I would trust that to stop a APDS round from a 110mm rheinmetall smoothbore.
And maybe... He might be talking about some ceramic materials that I'm not familiar with, but those are a whole different kettle of fish.
Aluminum (III) oxide (transparent alumina) is a new type of armor. It is used in many more military applications (such as interceptor missiles).
In a test, the armor survived 9 hits from a T-72 without any damage.
Currently, the actual armor composition of the Type-99/ZTZ-99 remains unknown. There are public photos of experimental Chinese composite armors, specifically Al2O3 under test. The armor didn't sustain any significant damage after being shot by a T-72C 125 mm armament seven times or a 105 mm armament nine times in a range of 1,800 meters, while rounds that are used in the test are unknown. The tank's front armor protection is claimed to be equivalent to 1,000~1,200 mm of steel armor, possibly against shaped charge warheads. Also, there are significant differences between the armor packages displayed on the current Type 99s and earlier 99 models seen in 1999.