The purpose of this standard is to describe a test method to determine the pozzolan content in three-component cements (clinker, setting regulator and pozzolan). GRADES. 1 When the cement has filler in quantities equal to or less than 5%, an additional error between —3 and +5% is made in the result obtained. For a given filler, this error is systematic. 2 This standard will be reviewed when the corresponding CEN standard comes into force.