D10

A parameter used to indicate that 10% of the mass of sand / soil are less than a defined diameter for a particle size, being determined by the use of sieves. For example, if 10% of a material passed through a sieve of 0.125mm, then this would mean that 10% of the particles are less than 0.125mm whilst 90% would be greater than that size in diameter. The figure used with the D will vary according to requirements and is frequently used to determine the gradation index of a material, primarily a sand for used in sports turf applications.