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Crude Rubber and Compounding Ingredients: A Text-Book of Rubber Manufacture ...
Henry C. Pearson
No preview available - 2016
accelerator acid action added alcohol amount ball boiling called caoutchouc carbon cements cent chemical chloride coagulation color combined comes complete compound connection consists contains cover cure degrees F dissolved distillation effect elastic evaporated extract fabric filter fine give grades gutta gutta-percha hard heat inches india rubber ingredients insoluble insulating iron known latex lead less lime liquid Litharge machine manufacture mass material matter mechanical melting metal method mineral mixed mixture molded natural obtained ordinary oxide Para patented pounds powder prepared present pressure properties proportion pure reclaimed removed resin result rubber compounding sample sheet similar soft soluble solution solvent sometimes specific gravity steam substance substitute sulphide sulphur surface temperature tion tires treated tree tube turpentine usually various vulcanization washed weight yellow zinc
Page 315 - Extract the sample continuously for 16 hours, unless the solution in the thimble is still colored at the end of that time, when the extraction shall proceed for a further period of 4 hours or longer.
Page 333 - The vulcanized compound shall conform to the following requirements, when tested by the procedure of the Joint Rubber Insulation Committee.
Page 345 - ... cover shall be cut from clamp to clamp (taking care not to injure the duck), and this pressure maintained for 5 min. At the end of this time the hose will be submerged in water to determine whether the inner tube is porous. The escape of air through the tube shall be distinct enough so that the porosity will not be confused with the escape of air which is confined in the structure of the hose. In the event the hose fails on bursting test at the point at which cut was made for porosity test and...
Page 321 - If the alcoholic-potash extract is over 2 per cent of the rubber as first calculated, subtract this excess also from the rubber. The organic-acetone extract shall be obtained by taking the difference between the total acetone extract and the free sulfur. The organic-acetone extract, free sulfur, total sulfur and alcoholicpotash extract shall be figured on the amount of gum as found by the above procedure.
Page 316 - ... or 3 cc. of bromine (if the acetone extract indicates a large amount of free sulfur, the amount of bromine should be increased). Heat gently on the steam bath until the solution is practically colorless and filter into a 400-cc. beaker. Dilute with distilled water until the volume is about 400 cc. Cover the beaker with a watch glass, heat to boiling on the steam bath, add 10 cc. of 10-per-cent barium-chloride solution and allow the precipitate to stand over night.
Page 317 - H2SO4 (10-per-cent) and determine the sulfur in the usual manner. Barium sulfate determined above is assumed to have been added as such . Obviously, if barium carbonate is present, it must be determined in order that an undue correction will not be made.
Page 319 - Dissolve the precipitate from the filter paper with hot chloroform, and catch the solution in a weighed 100 to 150-cc. beaker. Wash the flask with hot chloroform which is added to the same beaker, in order to include any insoluble matter adhering to the walls of the flask. Evaporate off the solvent...
Page 316 - Add to the flask containing the acetone extract 50 to 60 cc. of distilled water and 2 or 3 cc. of bromine (if the acetone extract indicates a large amount of free sulfur, the amount of bromine should be increased). Heat gently on the steam bath until the solution is practically colorless and filter into a 400-cc. beaker. Dilute with distilled water until the volume is about 400 cc. Cover the beaker with a watch glass, heat to boiling on the steam bath, add 10...
Page 315 - Solutlon, water and adding two or three drops of concentrated hydrochloric acid. If there is any insoluble matter or cloudiness the solution shall be heated on the steam bath over night and filtered. All reagents shall be of a purity equal to that called for in Krauch's "Standard Chemical Reagents; their Purity and Test.