1.1 This specification covers three types of mortar cement for use where mortar for masonry is required.1.2 The values stated in SI units are to be regarded as the standard. Values in SI units shall be obtained by measurement in SI units or by a This specification covers three types of mortar cement for use where mortar for masonry is required. Mortar cements are classified as Type N, S, or M, according to the prescribed physical requirements. Mortar cement shall conform to the prescribed requ