Is 3343 1965 Specification

of this office.The analysis proved that the clay content in the sand is less than 5% the is specification for natural moulding sand (is 3343-1965) vide page 4 para 5.1 specified that the moulding sand of different grades should contain 5% to 20% clay.Therefore, the sand available in this area cannot be classified under natural moulding sand.3.