TY - JOUR N2 - The main bulk density representation in the molding material is opening material, refractory granular material with a particle size of 0.02 mm. It forms a shell molds and cores, and therefore in addition to activating the surface of the grain is one of the most important features angularity and particle size of grains. These last two features specify the porosity and therefore the permeability of the mixture, and thermal dilatation of tension from braking dilation, the thermal conductivity of the mixture and even largely affect the strength of molds and cores, and thus the surface quality of castings. [1] Today foundries, which use the cast iron for produce of casts, are struggling with surface defects on the casts. One of these defects are veining. They can be eliminated in several ways. Veining are foundry defects, which arise as a result of tensions generated at the interface of the mold and metal. This tension also arises due to abrupt thermal expansion of silica sand and is therefore in the development of veining on the surface of casts deal primarily influences and characteristics of the filler material – opening material in the production of iron castings. L1 - http://www.journals.pan.pl/Content/101914/PDF/afe-2016-0070.pdf L2 - http://www.journals.pan.pl/Content/101914 PY - 2016 IS - No 3 DO - 10.1515/afe-2016-0070 KW - Molding mixture KW - Cold -box - amine KW - A casting defect KW - Opening material KW - Veining A1 - Hrubovčáková, M. A1 - Conev, M. A1 - Vasková, I. A1 - Benková, M. PB - The Katowice Branch of the Polish Academy of Sciences DA - 2016 T1 - Opening Material as the Possibility of Elimination Veining in Foundries UR - http://www.journals.pan.pl/dlibra/publication/edition/101914 T2 - Archives of Foundry Engineering ER -