The minimum and maximum densities of non-cohesive soils correspond to the lowest and highest possible state of compactness of a non-cohesive granular material. This test applies to natural soils where the largest elements have a diameter less than or equal to 50 mm and where the weight percentages of dry material pass through sieves with a square opening of 31,5 mm and 80 micrometres by side are respectively 70 % and 12 % or less.