DIN EN ISO 5370:2025-01

This document has been prepared by Technical Committee ISO/TC 238 "Solid biofuels" in collaboration with Technical Committee CEN/TC 335 "Solid biofuels", the secretariat of which is held by SIS (Sweden). This document specifies a method for determining the amount of material passing through a sieve with 3,15 mm diameter round holes. It is intended for use in all applications (such as laboratories, production sites, field locations) where the measurement of fines is required. A test portion is subjected to manual screening by means of a sieve with 3,15 mm diameter round holes while utilizing specific test conditions (for example, a template is used to guide the movement of the sieve, rotational speed is specified, the number of rotations is dependent on the nature of the material being tested) and the mass of the material passing through the sieve is determined as a mass percentage of the total mass of the test portion. The fines content is an important parameter since excessive amounts of fines in consignments of pellets can cause problems either in transportation systems or during combustion, or both. It also can cause health problems if the dust is inhaled and it increases the risk of dust explosions. Many of these problems are connected to the tendency of stratification of fines caused by any movement of the pellets. The responsible German standardization committee is Working Committee NA 062-05-82 AA "Biogene Festbrennstoffe" ("Solid biofuels") at DIN Standards Committee Materials Testing (NMP).