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

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