THE INDIA RUBBER WORLD 



[November 1, 1918. 



1,551. Treating latex, process and product. General Rubber Co., New 



York City. U. S. A. 

 1.557. Treatment of rubber like and similar materials. General Rubber 



Co., New York City, U. S. A. 



NEW "z¥aLAND. 



39,564. Rubber substitute and process. The Western Rubber Co.. 1143 

 Dock street, assignor to M. Gregory— both of Tacoma, Wash- 

 ington U. S. A. 



LABORATORY APPARATUS. 



LABORATORY WATER HEATER. 



CONTINUOUS supply of hot water is very desirable in 

 the lalioratory, particularly if it is always obtainable at 



will. The illustration shows a very neat 



ami dependable apparatus for this purpose. 

 In operation a simple turn of the hand 

 wheel shown at the right turns on both 

 sjas and water, the gas being ignited by 

 small pilot light projecting over the 

 burner. The burner is gauze-covered. The 

 fiame passes up the stack and heats the 

 water descending through a spiral pipe. 

 Tile ordinary size will heat a pint of water 

 a minute, from 50 to 130 degrees F. Other 

 sizes are furnished. All are com- 

 pact and easily mounted as wall 

 attachments over the labora- 

 tory sink or in some other 

 J\ 1/ convenient location. (Buffalo 



^=*^ Dental Manufacturing Co., 



Bufifalo. New York.) 



FOLDING FILTER PAPERS FOR RAPID FILTRATION. 



The following practical method of folding and placing quan- 

 titative filter papers in funnels has been described by H. A. 

 Noyes in "The Chemist Analist." The filter paper is folded as 

 shown in I of the cut. 

 The amount the paper is 

 folded past (a) depends 

 on the funnel used. The 

 corner is torn off so that 

 when placed in the fun- 

 nel the crease (b) has 

 no chance of drawing in 

 air w^hich lessens the 

 rate of filtration. The paper is shown in II folded in this way 

 and properly placed in a funnel. In this position about 300 cc. 

 of filtrate per minute is possible. The rate of filtration depends 

 on these points: (1) good contact of paper with funnel; (2) 

 the absence of a fold of paper e.xtending to the top, thus pre 

 venting suction down the side of the filter; (3) increased filtra- 

 tion pull due to point of the filter being centered over the outlet 

 but not touching the sides of the funnel. 



ENGALITH. THE ENGLISH GALALITH. 



Galalith. a German composition product of casein, is now be- 

 ing manufactured by three British concerns under the name 

 "Engalith." Large quantities of this substance are being made 

 for war purposes, and for export to America, France, Spain, 

 and Italy as well. It is produced in rods, tubes, and sheets, and 

 in some sixty different colors, and is worked up into a great 

 variety of articles for which hard rubber is commonly used. 

 Being slightly hygroscopic, however, it is not adapted for 

 articles that have to come into frequent contact with water or 

 acid, such as knife handles, bathroom tiles or basins, fountain 

 pens, fishing tackle, storage battery cells, and tooth and nail 

 brushes. 



Briefly, the process of making Galalith consists in rendering 

 the casein insoluble by the addition of salts and acids. The 

 product is then dehydrated and dried, when, by the addition 

 of formaldehyde, Galalith is obtained. The process is protected 

 bv numerous patents. 



REPORT OF THE COMMITTEE ON THE POISON- 

 OUS NATURE OF SOME ACCELERATORS, AND 

 PRECAUTIONS REGARDING THEIR USE." 



By Richard D. Earlc. Chairman. 



OWING to the increasing use of certain organic compounds 

 as accelerators in the vulcanizing of rubber goods, many of 

 which are marketed under misleading trade names, it is de- 

 sirable to call the attention of rubber manufacturers to the 

 poisonous properties of some of these products and to the fact 

 that disagreeable factory experiences may result unless due pre- 

 cautions are taken. 



The more common accelerators used to-day are aniline, hexa- 

 methylene-tetramine, para-phenylenediamine, para-nitroso di- 

 methylaniline and thiocarbanilide. 

 . ANILINE. 



SvMPTONS OF Poisoning. In small amounts, pallor, vertigo, 

 and blueness of lips result. In large doses muscular weakness, 

 strangulation and death. 



Antidotes. Fresh air, change of clothing, artificial respira- 

 tion. Use of milk in diet is recommended. Use of alcoholic 

 stimulants predisposes to poisoning and is excessively injurious 

 after poisoning has occurred. 



HEXAMETHyLENE-TETRAMINE. 



Symptoms of Poisoning. Rash and inflammation of skin 

 which has been in repeated contact with stock containing this 

 material. In severe cases blisters filled with watery fluid result. 



Antidote. Cleanliness and care in regard to clothing are the 

 best preventives. Change of occupation will cause the rash to 

 disappear, leaving no permanent effects. 



PARA-PHENYLENEDIAMINE. 



Symptoms of Poisoning. Inhalation of the dust gives the 

 symptoms of a common cold with sneezing and extreme depres- 

 sion. In larger quantities death with symptoms similar to those 

 of ptomaine poisoning. This is probably the most poisonous of 

 all the accelerators proposed up to date. 



All efi^orts should be made towards prevention of inhalation 

 of dust, by means of suction hoods over the mixing mills. 



PARANITROSO DIMETHYLANILINE. 



Symptoms of Poisoning. This causes a severe inflammation' 

 of the skin, increasing in severity according to the e.xposure. 



Antidote. Change of occupation. 



thiocarbanilide. 



S\'^IPT0MS OF Poisoning. Tliis material decomposes when 

 heated to vulcanizing temperatures with the formation of phenyl 

 mustard oil, the fumes of which cause pallor, blueness of gums 

 and lips. Probably the least poisonous of the common organic 

 accelerators. 



Antidote. Fresh air. 



recommendations. 



1. — Cleanliness is essential. The hands should be washed 

 before eating. Before leaving the factory a shower bath should 

 be taken and a complete change of clothing made. 



2.— Mixing inills should be provided with adequate suction 

 hoods, in which an efficient draft is maintained. 



3.— Ventilation of press rooms, especially if thiocarbanilide is 

 used. 



4. — Immediate attention to early symptoms and, if possible, 

 temporary change of occupation in the factory. 



5. — Periodical medical examination of employes in mixing and 

 compounding departments, and an educational campaign among 

 employes in regard to non-use of alcohol and chewing tobacco 

 while at work. 



6. — In the case of accelerators sold under trade names it is sug- 

 gested that steps be taken to ascertain the nature of the material. 



