A Wonder Book of Rubber

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ... Compounding Ingredients TN THE preceding chapter we told that there are a great many standard compounding ingredients, the general characteristics of which are understood by practically every manufacturer of rubber goods and surely by every rubber chemist. To go, however, into a detailed discussion of these materials would involve a book twice the size of this one. As an indication of the infancy of the rubber industry, our best authorities are gradually leaning toward the opinion that vulcanization is not as was generally supposed a chemical change, but merely a mechanical re-arrangement of molecules. When we consider that for years we have been working on the adverse theory, it shows that much is still to be learned about rubber. The most universally used of all compounds is Sulphur, which in some form is always necessary to effect Vulcanization. From among the many other ingredients that are employed by the expert compounder, those most frequently used are: Aluminite, asbestos, zinc oxide, litharge, white lead, barytes, whiting, china clay, fossil-flour, mica and talc. Less frequently used materials, which give the compound some distinct characteristic for some particular use, are: Asphalt, camphor, clay, chalk, charcoal, cork, earths of various kinds, emery, flint, gelatine, graphite, leather waste, lime, paraffin, pitch, coal, pumice, sawdust, shellac, sand, slate, soapstone, starch talc, tar, varnish and wheat UPPER: CRUDE TAPPING METHODS USED ALONG THE AMAZON, BRAZIL. LOWER LEFT: ON MALAY PLANTATIONS THE MORE SCIENTIFIC HERRING-DONE PROCESS IS EMPLOYED. LOWER RIGHT: EXTRACTING LATEX FROM THE LANDOLPHIA VINE, PORTUGUESE, EAST AFRICA UPPER: COLLECTING THE LATEX ON AN EAST INDIA RUBBER PLANTATION. CENTER: 3ERINGUEIRO, OR BRAZILIAN...