A FISHING LINE SINKER

摘要

Abstract The invention relates to a fishing line sinker which is formed by pressure moulding a cement matrix composition comprising at least ferrous-ferric oxide and hydraulic cement. A preferred sinker composition comprises magnetite in an amount of from about 40% to 85% by dry weight and high-alumina or Portland cement in an amount of from about 2% to 25% by dry weight. The sinker preferably has magnetic properties. The invention also relates to a method of manufacturing the fishing line sinker wherein these components are mixed together with water and other optional components, including additives and/or excipients, to form a dough or paste, and the dough or paste is pressure moulded into any desired shape, size and weight, then cured to form the sinker. The sinker may then be made absorbent or porous by a sintering process, firing process or autoclaving process.