This part of ISO 9652 specifies reference methods for testing a) the compressive strength of masonry units; b) the compressive strength of masonry; c) the flexural strength of masonry; d) the water absorption of clay units; and e) the compressive strength of mortar. It is applicable to masonry built with units of fired clay, calcium silicate, concrete (including autoclaved aerated concrete), natural stone or manufactured stone. NOTE The methods may be suitable for testing other walling materials, but they have not been examined as reference tests in this respect.