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rubbed, rubber. Rubbed brick, brick rubber, cutter, or malm is a soft brick made of special well-mixed fine loamy clay containing a lot of sand and baked (not burnt) in a kiln, readily sawn and rubbed to the required shape. It is used for making gauged brick arches, etc., the extremely fine joints between the rubbers being formed of lime-putty rather than conventional mortar, which would be too coarse.
N. Lloyd (1925);
W. McKay (1957)