The notified rule establishes the test method for determining the specific surface of cements, expressed in cm2/g, using Blaine permeability apparatus. The method may be manual or automatic, the former being the reference method. This rule applies to cements to be used in the creation of mortars and concretes. This rule does not concern safety issues, if there are any, associated with its use. It is the responsibility of the user of this rule to establish appropriate health and safety practices, and to determine the degree of application of the regulatory limitations prior to use.