TY - JOUR N2 - The aim of the hereby paper is to present the developed model of determining the volume and surface porosity based on the main fraction of polifractional materials, its experimental verification and utilisation for the interpretation of effects accompanying the formation of a moulding sand apparent density, porosity and permeability in the blowing processes of the core and moulds technology. L1 - http://www.czasopisma.pan.pl/Content/101952/PDF/afe-2016-0108.pdf L2 - http://www.czasopisma.pan.pl/Content/101952 PY - 2016 IS - No 4 DO - 10.1515/afe-2016-0108 KW - porosity KW - Sand grains KW - Moulding sand A1 - Dańko, R. A1 - Dańko, J. PB - The Katowice Branch of the Polish Academy of Sciences DA - 2016 T1 - Determination of the Surface and Volume Porosity, on the Basis of the Main Fraction of the Polifractional Matrix of Moulding and Core Sands UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/101952 T2 - Archives of Foundry Engineering ER -