The paper presents results of measuring heat diffusivity and thermal conductivity coefficients of used green foundry sand in temperature
range ambient – 600 o
C. During the experiments a technical purity Cu plate was cast into the green-sand moulds. Basing on measurements
of the mould temperature field during the solidification of the casting, the temperature relationships of the measured properties were
evaluated. It was confirmed that the obtained relationships are complex and that water vaporization strongly influences thermal
conductivity of the moulding sand in the first period of the mould heating by the poured and solidified casting