STANDARDIZED AUTOCLAVES FOR TESTING CRACKING RESISTANCE OF CERAMIC TILES
UNI EN ISO 10545-11 STANDARD
Crazing means hair cracks on the glazed surface of the tile. Resistance to the formation of crazing is determined by subjecting the whole tiles to high pressure steam in an autoclave and then checking the tiles for the presence of crazing after applying a colouring substance to the glazed surface. For large sized tiles the standard envisages cutting. The cut pieces must be as large as possible and each part must be checked.