If tile absorbs more than 7% moisture it is: (ALSO KNOW THE FOLLOWING: IMPERVIOUS – LESS THAN .5% ABSORPTION – VITREOUS – MORE THAN .5% BUT LESS THAN 3% ABSORPTION – SEMI-VITREOUS – 3% TO 7% ABSORPTION)

If tile absorbs more than 7% moisture it is: (ALSO KNOW THE FOLLOWING: IMPERVIOUS – LESS THAN .5% ABSORPTION – VITREOUS – MORE THAN .5% BUT LESS THAN 3% ABSORPTION – SEMI-VITREOUS – 3% TO 7% ABSORPTION)