In June of 1996, ASTM C 1329-96 Standard Specification for Mortar Cement was approved. Previously, only the Uniform Building Code included a standard for mortar cement, a relatively new cement product designed for use in demanding structural masonry applications. Like masonry cement, mortar cement is a hydraulic cement primarily used to produce masonry mortar. However, mortar cement must meed lower air-content limits than masonry cement and is the only mortar material or system that has minimum bond-strength requirements. The approval of ASTM C 1329-96 reflects the increased availability and use of mortar cement across the United States. It means that the ACI 530/ASCE 5/TMS 402 Building Code Requirements for Masonry Structures can incorporate similar provisions for the acceptance of mortar cement in structural applications in all seismic performance categories. Referenced by the National Building Code and the Standard Building Code, this document governs the design of masonry in much of the eastern part of the United States.