352 



THE INDIA RUBBER WORLD 



[April 1, 1916. 



tating ordering. There is also included considerable informa- 

 tion regarding the care and abuse of solid tires and some hints 

 regarding alignment, with simple means for testing, this being 

 illustrated by diagrams. The book also contains the guarantee 

 which the company furnishes with each sale of its solid tires. 



"Rubber Facts and Figures" is the title of a compact little 

 book of about 140 pages published at somewhat irregular 

 intervals by Frederic C. Mathieson & Sons, London, Eng- 

 land. Xumber 13, bearing date of February, 1916, is at 

 hand. While small enough to go in the pocket, a vast 

 amount of information has been crowded into it regarding 

 rubber planting corporations in the Far East, telling the 

 authorized capital, highest and lowest prices and number 

 of shares, number of acres planted in rubber, dividends paid, 

 etc. The increases in the outputs month by month during 

 the past two years are given in tabulated form. The number 

 of forward sales announced for 1915 and 1916 is also given. 

 In fact, the book is one which will be found of use as a 

 ready reference by all interested in plantation rubber, either 

 as consumers or investors. 



DETERMINATION OF BARIUM SALTS IN VULCAN- 

 IZED RUBBER GOODS. 



SPECIFICATIONS for purchasing rubber goods frequently 

 permit the use of barytes (barium sulphate) as a mineral 

 filler without having the sulphur which it contains count as part 

 of the specified total sulphur. In such cases, in order to prop- 

 erly correct the total sulphur, the barium sulphate must be de- 

 termined. The Bureau of Standards, of the Department of Com- 

 merce, has recently completed a careful study of the question and 

 has just published the results in "Technologic Paper No. 64." 



When barium sulphate only is used, the amount present is 

 readily ascertained by determining the total amount of barium 

 present. If barium carbonate is used, it is necessary to separate 

 the two salts. By means of tests made on compounds of known 

 composition prepared at the Bureau of Standards, a method has 

 been devised which permits the quantitative determination of 

 barium carbonate in the presence of either lead sulphate or 

 barium sulphate, the two sulphates most commonly used in rub- 

 ber goods. The accuracy of the determination is satisfactory 

 for all practical purposes. This method of analysis for barium 

 carbonate, which is the work of John B. Tuttle, is as follows : 



One gram of the rubber is ignited in a porcelain boat in car- 

 bon dioxide, the residue finely ground in an agate mortar, trans- 

 ferred to a 250 cc. beaker, and treated with 5 to 10 grams am- 

 monium carbonate, IS to 20 cc. of strong ammonia water, and 

 about 50 cc. of distilled water. The mixture is boiled for 15 to 

 30 minutes, filtered and the precipitate thoroughly washed to 

 remove all soluble sulphates. The residue on the filter paper is 

 washed back into the original beaker with distilled water. About 

 10 cc. of glacial acetic acid and sufficient water is added to make 

 the total volume of the solution about. 100 cc. By this procedure 

 lead, barium, calcium and zinc carbonates pass into solution, 

 while barium sulphate and lead sulphide are not attacked. 



Hydrogen sulphide is passed into the filtrate, the lead sulphide 

 filtered off. the filtrate heated on the steam bath, and 10 cc. of 

 10 per cent sulphuric acid added. The following day the pre- 

 cipitate is filtered, ignited, cooled and weighed. 



The final step is to determine the total barium in the rub- 

 ber compound, as barium sulphate, by the method for determina- 

 tion of barytes used at the Bureau of Standards [The Indi.^ 

 Rubber World, December, 1914. page 128.] Barium carbonate 

 is determined in a separate sample by Mr. Tuttle's method, just 

 described, and an equivalent amount of liarium sulphate is de- 

 ducted from the total barium sulphate. The sulphur in the re- 

 maining portion of barium sulphate is calculated, and the total 

 sulphur determination corrected by this amount. 



RUBBER TRADE INQUIRIES. 



[155.] A correspondent seeks an .American manufacturer who 

 can furnish 5,000 valves for bicycle inner tubes, to be shipped 

 from America to Singapore. 



[156 ] .'Xn inquirer desires to be placed in touch with a man- 

 ufacturer of waxed paper, such as is used in wrapping inner 

 lubes. 



[157.] ^\'e are in receipt of an inquiry for Pontianak refining 

 concerns. 



[158.] An inquiry has been received for the name of a 

 manufacturer of flexible rubber curry combs. 



[159.] .^ correspondent wishes to be placed in touch with 

 .■\merican firms who can supply crude rubber stock (washed, 

 compounded and rolled into sheets but not cured) for use in 

 tlie manufacture of about 15.000 inner tubes for automobiles. 



[160.] The name of a company making and selling the hard 

 rubber clincher bead which is the center of tlie bead used in 

 making tires is desired. 



TRADE OPPORTUNITIES FROM CONSULAR REPORTS. 



Representation for American manufacturers of rubber goods 

 is desired by a man in Argentina. Report No. 20.291. 



A Portuguese firm, which exports rubber, desires to secure 

 an import agent in New York City. This firm also wishes to 

 represent .A.merican exporters of goods for Portuguese African 

 colonies. Report No. 20,295. 



Quotations from American manufacturers of jinrikisha tires 

 are solicited by a firm in China using about 6,000 tires annually. 

 Report No. 20,329. 



A Norwegian firm would like samples and quotations f. o. b. 

 New York on rubbers and arctics. Report No. 20.352. 



A man in Italy wishes to purchase American jam jars and 

 bottles for preserves or fruits, with tin lids and rubber rings. 

 Report No. 20,369, 



A Canadian firm would like to be placed in touch with Amer- 

 ican manufacturers and exporters of rubber window cleaners. 

 Report No. 20,412. 



\'ulcanized fiber and other insulating materials are desired by 

 a firm in England. Report No. 20,435. 



A traveling agent in Norway desires to receive samples, cata- 

 logs, quotations, etc.. from -American manufacturers of rain- 

 coats for both men and women. Report No. 20,448. 



DRAWBACK FOR RUBBERIZED AUTO-TOP CLOTH. 



The exportation of auto-top cloth has reached such pro- 

 portions, due to war requirements, that the Treasury De- 

 partment has prepared drawback regulations to meet the 

 situation. As in the case of other classes of drawbacks, 

 manufacturers are required to keep a detailed record of all 

 data necessary for government agents to base a decision as 

 to whether a drawback accrues or not. It is specified that 

 the allowance shall not exceed the quantity of imported cloth 

 used in the manufacture of the exported auto-top cloth, as 

 shown by the abstract from the manufacturing record, the 

 allowance to be reduced according to the quantity of im- 

 ported cloth which the value of the waste, if any, will re- 

 place. The American Rubber Co. and the Stoughton Rubber 

 Co. have been authorized to receive drawback under these 

 regulations. 



