India rubber world . mzation at about 100° to 110° C. the tireis pressed into a mold made of a bad heat-conducting ma-terial, like asbestos, so formed that, while the tire is furthervulcanized under greater heat, the portions which form thetread become hardened and the inner part remains elastic. 342 THE INDIA RUBBER WORLD [July 1903. ADULTERATION OF RUBBER. TII F compounding or adulteration of crude Indiarubber atfirst hands—in other words, by the gatherers—is an evilwhich both importers and manufacturers strenuously importer and almost every manufacturer at times hasbeen surpris
India rubber world . mzation at about 100° to 110° C. the tireis pressed into a mold made of a bad heat-conducting ma-terial, like asbestos, so formed that, while the tire is furthervulcanized under greater heat, the portions which form thetread become hardened and the inner part remains elastic. 342 THE INDIA RUBBER WORLD [July 1903. ADULTERATION OF RUBBER. TII F compounding or adulteration of crude Indiarubber atfirst hands—in other words, by the gatherers—is an evilwhich both importers and manufacturers strenuously importer and almost every manufacturer at times hasbeen surprised and annoyed to find lumps or balls of rubber,the interior of which developed billets of wood, stones, bricks,cast off clothing, and a variety of worthless make order to guard against this, when rubber is accepted fromthe gatherers it usually is cut open for an examination of theinterior. This method being generally followed, serves to checkthis sort of dishonesty. Many lots of rubber, however, are. causes ; exhaustion of the rubber trees, the admixture of milksother than those coming from the Htvea, the addition ofearthy substances and finally its mixture with farinaceous sub-stances, such as fecula, starches, etc., and in proportions suchas could not have occurred by accident. What has broughtabout these results? At any rate this fraud should not be al-lowed to continue; it should be arraigned, stopped, and de-stroyed. Such a destructive state of things to our industriesmust be brought to a stop, or it will in the future become dis-astrous if obstacles are not placed in its progress. Actionshould be taken at the earliest possible moment by giving thegreatest publicity to the proof of this state of things. Insiston the merchants furnishing pure material, and that they intheir turn demand pure material from the importers and thosewho gather the material, so that the milk from the Htvea maybe pure, that there may be no mixtures with other milks, thatthere may
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