Crude Rubber and Compounding Ingredients: A Textbook of Rubber Manufacture |
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accelerator acetone acetone extract alcohol alkali alum aniline antimony balata ball Barytes benzine benzol benzoyl peroxide bisulphide boiling calender canization caoutchouc carbon cements cent chemical chloride of sulphur coagulation coal tar color contains crude rubber cure degrees F dissolved distillation dried elastic ether evaporated fabric fiber filter free sulphur grades gutta gutta-percha hard rubber heat Hevea hydrocarbons inches india rubber ingredients insoluble insulating isoprene known Lampblack latex lead lime linseed oil liquid Litharge magnesia material mechanical melting metal method mineral mixed mixture molded naphtha nitric acid obtained odor ordinary ounces paraffin patented peroxide petroleum pounds powder resin rosin rubber compounding rubber manufacturers sample sheet shellac silica soda soft soluble solution solvent specific gravity steam substance sulphate sulphide sulphuric acid surface temperature tion tires tree tube turpentine vulcanized rubber washed waterproof yellow Zinc oxide
Popular passages
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 334 - Contamination of the compound, such as by the use of impregnated tapes, will not excuse the manufacturer from conforming to this specification.
Page 314 - Before preparing a sample for analysis the analyst shall, by inspection, assure himself that it has not been contaminated. The sample shall be prepared by taking pieces from various parts of the original sample and separating them from foreign matter. The rubber shall be ground to the required fineness on a rubber mill or cut with scissors so as to pass a No. 14 sieve.
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...