Buzzi Unicem USA Portland cement products are manufactured within the guidelines of either ASTM C150 (Standard Specification for Portland cement) or ASTM C595 (Standard Specification for Blended Hydraulic cement).  Our masonry product line is manufactured within the guidelines of ASTM C91 (Standard Specification for Masonry cement).  Qwix® is regarded as a hydraulic cementitious material per ASTM C219.