ISO 4497:2020 PDF

Overview

ISO 4497:2020 - Metallic powders - Determination of particle size by dry sieving - specifies a standardized method to determine the particle size distribution of dry, unlubricated metallic powders by dry sieving into size fractions. The method applies to powders with essentially equiaxial morphology and is not applicable to flake-type powders or powders that are wholly or mostly under 45 µm.

Key topics and technical requirements

• Principle: Separate powder into fractions by shaking through a stack of calibrated wire cloth test sieves and weigh each retained fraction and the pan fraction.
• Test sieves: Use calibrated non-magnetic wire cloth sieves mounted in non-magnetic frames (nominal diameter 200 mm; depth 25–50 mm). Aperture sizes should follow ISO 565 principal or intermediate sizes and be chosen to resolve the distribution adequately.
• Test portion: Typical masses are approximately 100 g for powders with apparent density > 1.50 g/cm3 and 50 g for densities ≤ 1.50 g/cm3. Minimum test portion is 10 g for smaller-diameter sieves (mass should be adapted to sieve area).
• Sieving method: Can be performed manually or by a mechanical sieving machine. Endpoint criterion: sieving continues until the quantity passing the sieve retaining the largest fraction in 1 minute is