1.1 This test method covers the determination of particle size distribution of putting green and other sand based root zone mixes. Particles larger than 0.05 mm (retained on a No. 270 sieve) are determined by sieving. The silt and clay percentages are determined by a sedimentation process, using the pipet method. This procedure was developed for putting green rootzone mixes; those assumed to have sand contents of 80% by weight or greater. Particle size analysis of soils may be performed by this or other test methods described in Section 2. This test method also describes a qualitative evaluation of sand particle shape. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.