NOTE 1    This method is designed to determine the level of impurities larger than 3,15 mm with a specific density >1 g/cm³, such as stones, glass, rubber, metal and certain types of plastics.

NOTE 2    During the processing of the sample, hand sorting of light impurities with a specific density ≤1 g/cm³ (e.g. plastic foil) can also be done.

NOTE 3    Some heavy extraneous materials (e.g. lumps of clay) can fall apart when submerged in water.

NOTE 4    Heavy extraneous materials smaller than 3,15 mm can damage milling equipment, when reducing the material in size to produce laboratory samples.