Cast Iron for the Manufacture of Glass Bottle Moulds

JSGT 1936 V20 T045-T053

 A proposed specification of the composition of refined pig iron suitable for glass bottle moulds was, total carbon 3·1% (maximum), sulphur 0·07 (maximum), phosphorus 0·45 (maximum), manganese 0·8–1·5, the silicon content varying according to the thickness of the casting. Two such pig irons of different silicon contents (e.g. 1·59 and 2·68%) covered, by appropriate mixtures, all casting thicknesses from 3/8” to 1 ¾”. Little alteration of composition occurred if the raw materials were melted in crucibles, but allowance was made for the increased carbon and decreased silicon contents brought about by cupola melting. The molten metal was partly desulphurised and refined in the ladle by treatment with sodium carbonate.

N. L. Evans, W. Goacher & J. E. Hurst