This European standard specifies a method for the determination of the characteristic size of the openings of a single layer of a geotextile or geotextile-related product using the wet-sieving principle.
BS EN ISO 12956:1999 history
2020BS EN ISO 12956:2020 Geotextiles and geotextile-related products. Determination of the characteristic opening size
2010BS EN ISO 12956:2010 Geotextiles and geotextile-related products - Determination of the characteristic opening size
1999BS EN ISO 12956:1999 Geotextiles and geotextile-related products - Determination of the characteristic opening size
1989BS 6906-2:1989 Methods of test for geotextiles - Determination of the apparent pore size distribution by dry sieving