Published at Saturday, May 25th, 2019 - 05:43:19 AM. Ceramic Tile. By Delmare Cariou.
Finally, there is the issue of a ceramic tile being food-safe. Many decorative ceramic art tiles are used as serving trays for a variety of hot and cold foods and it is important that these not leach out chemicals. Even a glaze said to be food-safe often is not. John Hesselberth and Ron Roy, in their book, Mastering Cone 6 Glazes demonstrate this by placing a lemon wedge on a 'food-safe' glazed piece of ceramics. Within hours the glaze is discolored from leaching out of the chemicals.
For ceramic walls in dry areas not subject to much physical contact most any type of tile and glaze is adequate. For wet areas flat tiles, low relief tiles or even high relief tiles can be used so long as they are not in a hazardous place that a body can inadvertently come into contact with them. A large frog leaping out from your shower wall at body height is probably not a good idea. Obviously, porous tiles are not good for wet areas. So long as the tile is vitreous – has been fired to maturity such that the crystalline structure is unified – the tile or glaze is OK, however the joints between the tiles will need to be sealed. Again, the best bet here is a high fired stoneware tile with a dependable glaze.
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