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Euphorbia tirucalli resin from South Africa

, : Euphorbia tirucalli resin from South Africa. Bull Imp Inst [Gr Brit] 42(1): 1-3

The sample of resin was prepared in Natal by extraction with denatured alcohol of the coagulum obtained from the latex of E. tirucalli. It weighed 20 lb. and consisted of lumps, fragments and powder varying in color from light to dark yellowish-brown; the material was brittle. Chem. examination showed loss at 100[degree] C in vacuo 5.8%. ash 0.6%, acid value 6.3, saponification value 45.1. m.p. 51[degree]. Solubility in acetone, alcohol, benzene, chloroform, ether, petroleum ether (b.p. 60-80[degree]), and turpentine, in the cold, on heating, on cooling, and after standing for 24 hrs., is given. Expts. at the Imp. Institute, supplemented by studies at the Paint Research Station, Teddington, showed that linseed oil varnishes and paints are too slow-drying at ordinary temp, for general use, even with abnormally high drier content; heating ameliorated this defect. The weathering characteristics of both the varnishes and paints were reasonably good but the varnishes were sensitive to water. The resin might find limited application in spirit varnishes as an alcoholic solution. It is conceivable that such resin might find a limited use in the linoleum, oilskin and leathercloth industries, or possible even as a paper size while the supply conditions for the more orthodox materials are difficult.


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