The cement shall be provided with a factory certificate according to the factory, type, batch number and mark number. The certificate shall include the cement brand, factory mark, type, mark, ex factory date, batch number, certificate number, compressive strength, flexural strength, stability and other inspection data and inspection conclusions. Sampling and reinspection at the construction site shall be carried out according to the fact that every 200 tons of cement produced by the same manufacturer, of the same type and with the same grade is a batch