Reviewer: Geotechnical Analysis Desk Date: April 14, 2026 Subject: ASTM D422 – Standard Test Method for Particle-Size Analysis of Soils 1. Executive Summary ASTM D422, formally titled Standard Test Method for Particle-Size Analysis of Soils , served for over six decades as the definitive laboratory procedure for determining the distribution of particle sizes in mineral soils. Withdrawn by ASTM International in 2016, this standard is no longer maintained for new use, but its legacy endures in countless existing geotechnical reports, specifications, and engineering libraries. This review evaluates D422’s historical strengths, practical weaknesses, and its relationship to the modern replacement standards (primarily ASTM D6913 and D7928).