EN 772-3:1998 Methods of test for masonry units - Part 3: Determination of net volume and percentage of voids of clay masonry units by hydrostatic weighing
This European Standard specifies a method of determiningThe net volume of and percentage of voids in clay masonry units (including frogs and cells).
EN 772-3:1998 history
1998EN 772-3:1998 Methods of test for masonry units - Part 3: Determination of net volume and percentage of voids of clay masonry units by hydrostatic weighing