| Dr. Dave's Hemp Archives | From, Jamieson, Vegetable Fats and Oils, 1943: Hemp Seed Oil. This oil is obtained from the seed of the plant Cannabis sativa, which is chiefly cultivated for its fiber in India, Manchuria, Europe and on a comparatively small scale in the United States. It is, however, also grown for its seed in China, Japan, France, Italy and Russia. Experiments have been made in the United States with certain varieties of hemp particularly adapted for the production of seeds by F. Rabak [Pt., Oil and Ch. Rev., 83, No. 3, 16 (1927)] of the Bureau of Plant Industry, with the object of establishing a new oil industry in this country. Hemp seeds contain from 32 to 35 per cent of oil. Both the extracted and expressed oils have a greenish color. In some Asiatic countries, the oil is used for edible purposes, but elsewhere it is chiefly used as a paint oil. It gives a green soft soap somewhat similar, except for color, to that made from linseed oil. The characteristics are as follows: Sp. g. at 15.5° C. 0.9285; ND40° 1.4723; Sap. V. 190 to 193; Iod. No. 150 to 166; Unsap. 1 to 1.3 per cent; Titer 15° to 16.6° C.; Hexabromides 8.8 per cent. Kaufmann and Juschkuvetsch [Z. angew Chem., 43, 90 (1930)] examined a sample of the oil with the following results: Iod. No. (Hanus) 167; SCN V. 101.6; Sat. Acids 9.5 per cent; Unsap. 0.97 per cent. It contains the following fatty acids: Oleic 11.8, linoleic 49.8, linolenic 22.8 per cent (alpha-linolenic acid 7.5 ). The use of the oil in the manufacture of varnishes is discussed by Kiselef and Charof in Chim. & ind., 23, 1461 (1930). It is said to be an excellent vehicle for grinding colors [H. Friedman, Am. Paint J., 20, 48 (1936) ]. |