| 摘要 |
971,772. Mould and core materials. F. W. BERK & CO. Ltd. May 30, 1962 [June 16, 1961], No. 21923/61. Heading B3F. A foundry moulding sand comprises in admixture, sand, peat and an amount of a alkali metal hydroxide or a strongly alkaline water-soluble metal salt sufficient to increase the pH of the composition to 7 or more. Preferably sodium hydroxide or sodium carbonate are used.
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