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Other grades are used for special surface treatment. Other grade products which include CS high purity zirconia, ZR reactive zirconia, HC hydrated zirconia and YZ yttria stabilised zirconia are vital to the creation of specialty ceramics such as structural and piezoelectric ceramics, oxygen sensors, thermal barrier coatings and pigment coatings. Average particle sizes from 0.6 to 4.3 microns.