GB/T 9776 - 2008 standard is formulated around building plaster. It defines the term definition of building plaster, standardizes its classification and marking. In terms of technical requirements, it stipulates key performance indicators such as setting time, strength, fineness and flexural strength of building plaster. At the same time, it gives detailed test methods, covering the measurement process of various indicators, as well as product inspection rules, including sampling scheme and judgment criteria. The standard is for the production and mass inspection of building plaster to ensure that it can meet different engineering needs in the construction field and ensure the mass of construction projects.