This is one of several ASTM specifications on this ballot that was last updated in 2017 and has not been balloted since that time. During this five-year period, many changes have been made to more current brick specifications that have yet to be incorporated into this specification. The changes in this proposal are intended to incorporate such text into this specification. This is needed in order to make the content of the brick standards as consistent as possible except where they need to be different due to application, treatment or otherwise. Please note that this specification needs to be updated in 2022 to remain an active ASTM standard.