nonvitreous tile

nonvitreous tile

Ceramic tile having a degree of vitrification evidenced by a water absorption greater than 3%; an exception is nonvitreous floor and wall tile, which has a water absorption above 7% but less than 18%.
References in periodicals archive ?
2) Especially nonvitreous tiles are used indoors as wall tiles and semivitreous tiles are only used indoors, on walls and floors.