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hollow brick stresses
amer., Makarov.	пустотный кирпич с площадью пустот не более 40% от площади постели кирпича
build.mat.	керамоблок (Heavier bricks are poor insulators of sound while light weight and hollow bricks provide good sound insulation. slideshare.net zal)
construct.	пустотный кирпич с площадью пустот не более 40% или не более 25% от площади постели кирпича; перфорированный кирпич (Ma_russie); пустотный кирпич; пустотелый кирпич
geol.	пустотельный кирпич
tech.	дырчатый кирпич; пустотелый кирпич (Bricks may also be classified as solid (less than 25% perforations by volume, although the brick may be "frogged," having indentations on one of the longer faces), perforated (containing a pattern of small holes through the brick removing no more than 25% of the volume), cellular (containing a pattern of holes removing more than 20% of the volume, but closed on one face), or hollow (containing a pattern of large holes removing more than 25% of the brick's volume). wiki Alexander Demidov)

hollow brick: 6 phrases in 2 subjects

Building materials	4
Construction	2