Mortar code

M2.5, M5, etc. As of May 18, 2023, the commonly used mortar codes are M2.5, M5, M7.5, M 10, etc. , according to the purpose can be divided into masonry, plastering, joints and other categories, but has nothing to do with the label. Mortar is the binding substance of building bricks, which is made of a certain proportion of sand and cementitious materials (cement, lime putty, clay, etc.). ) and water.