All masonry units are manufactured to conform to ASTM Standards C-90 Type II for hollow load bearing units and C-145 for solid load bearing units.
The raw materials used in the manufacture of lightweight masonry units conform to ASTM C-331.
It should also be noted that the concrete brick produced meet ASTM C-55 Type S for moderate strength brick and ASTM C-55 Type N for high strength brick where moisture penetration is to be minimal.
All fire rated masonry units, based on the equivalent thickness procedure, are produced from lightweight haydite or slag aggregates and will conform to NCMA, BOCA or Underwriter requirements depending upon specification.