Document Oz5O9YGvM7ZobxZo2O0bnBqq1

328 29th Xaiionat Safety Congress Sews Letter Committee--)auks J. Duggax (Chairman). Carbide & Carbon Oioaicals Corp, Sooth Charleston, \V. V*. K- S. Macuc. Incandescent Lamp Dept, General Electric Co, Cleveland, Ohio. ) H. T\ru>t, Procter & Gamble Co* Cincinnati. Ohio. engineering Committee D. S. ifrEAOPy (Chairman). American Cvasaaid Ox, New York, X. V. Harold \\\ Baker. Eastman Kodak Cd, Rochester. X. Y. F. VV. Juttas. Westvaoo Qslorine Products Gorp, Carteret. X. J. *Si E- \Vnrnx<* Liberty Mntnl luwmn (*a_ Boston. M?** thsta Sheet Committee--S. M. McCctcheox (Chmnaa), The Dow Chemical Co, Mid land. Mich. *Kaith 0. Kiuut, Atummna Co. oi America, Pinsbsith Pa. Health Committee--Da. Lcosaso GscccBuac (Chairmen). X. Y. State Department ox Labor. New York. X. Y. "Johx S. Shaw. Hercules Powder Co, WUmntytcn, Del Membership Committee--C E. SevtOO (Chairman), Monsanto Chemical Co, Boston. Mas* \V- L MAmrrmrr, Electric Storacc Banery Co, Philadelphia, Pa ^N C* BatL** (Chairman). Union Carbide & Carbon Corp, New York, John Cleubos. Michigan Alkali Co, Wtandone, Mich. 'Ralph L Roctss, Jt, Toseiicc Eastman Corp, Kingsport. Toon. Pubtieirr Committee--S. D. Ki*KTATia<x (Chairmen). ChexmoJ & MetaHorriraJ Enrinerrmg. Nor York. X. Y. A. L Watsok, Hoppers Co, Pittsburgh. Pa. Ct^accoe Wtax. Niagara Alkali Co, Niagara Falls. X. Y. Safety Instrnetion Card Committee--F. Kixr. (Chairman). Lever Brothers Ce, Cam bridge, Mass. Joax Roach. Deputy Commissioner of Labor. Trenton. X. ). K. E. Root. Willard Storage Battery Co, QnthitL Ohio. Statistia ft Contest Committee--K. C Slums (Chmrmmj. Tht Tnvrlcr, him, Co, Hartford, Cams. ^ Mixn. E. I. do Pont dc Xctnoan & Co, Inc, Wilmington, DeL ' Pitt General Ckrrmn TUESDAY LUNCHEON' SESSION Octobcr S. 1940 The opening session was a special lunch eon meeting, attended by a large number of delegates. GoteraJ Chairman Ralph O. Keefer. Purchasing Agent, AJamraum Com pany of America. Pittsburgh. Pa, presided. Following the luncheon. the Chairman trd- corned the dd^ates and grata, spoke briefly of the Section** activities during the PM Jtar, and then introduced the speaker of the occasion. Mr. O. S. True. whm< ad dress is given below. The Use of Rubber and Rubber Compounds in the Chemical Industry Bras. TRITE United State* Rabbet- Company. New York. N. Y. Strictly speaking, robber as such would be of little value to the dtonial industry. It owes its valuable properties to an ability to combine chaniall)' with certain sub stances nch as sulphur, and Co its ability to incorporate with and to hold in uniform Chemical Section 329 dispersion certain reinforcing materials such ws carbon blade. Also the duality and dura bility of modern compounds has been much unproved by the addition of small quantities of accelerators and anti-oxidanUk lor the most part complex organic materials which improve the uniformity of the cure and in crease the rests&noe to natural aging. Robber can be compounded so as to pro vide substantia] resistance to corrosion and abrasion, as well as high dielectric, low coefficient of beat transfer, and masted ability to absorb vibration and shock. These properties rubber of value to the chemical industry. With regard to corrosion, an ow-pmoit problem in the chemical industry, rubber cao be compounded to satisfactorily resist the following: I. Most inorganic adds--indoding hydro chloric. phosphoric, dilute sulphuric etc. t Most organic arid?---such as arctic formic tartaric etc 3. Inorganic Iasi*--caustic soda, etc 4. Inorganic salt* chlorides, sulfates etc 5. Organic salts--acetates tartrates, etc 6. Bloch solutions -^i>pocti1orilcs chlo rine soturietis So one compound is satisfactory for use in connection with all of the above classifi cation* but a suitable cuntpound can br ob tained for each individual requirement. Robber is not suitable for use with the following: 1. Strung axidiring agents such as nitric and chronic arid*. Z Aromatic hydrocarbon* mrii as benaol and tofaxoL y Aliphatic hydrocarbon.*--petrokuro and hs derivatives. Robber has one further limitation which should be borne m grind: tamely- tempera* tore. While compounders have improved the temperature irsistance of rubber. 160 to yt> degrees F. must Still be considered the practical maximum for industrial rubber poods, if long fife is to be obtained. For present purposes, son* generalitatfon may be made There is the type abra sion by a material sliding over a sur face a shoring action, and there is the type caused by nupinging of a material against a surface, abrasion dne to impact. Between the two extreme r>pes is an infinite number of romlanathms. Different rubber com* poonds are necessary for different tjpes of abrasion, bat unless the impact is so severe as to cut the robber to pieces, the proper compound has a very high degree of re sistance to abrasion. Without qualitative tests it is not possible to say just bow much more resistant rubber is than some other material, but such tests on be made if nec essary. When corrosion and abrasion are both present, rubber is an ideal material al though if the corrosive action is so severv as io mate necessary a compound designed pri marily to rcdfi corrosion, is might be necmsarv to sacrifice some abrasion resistance. With regard to dielectric for potentials up in JOjOOO vote, rubber is generally coorid- rrvri the best available commercial insula- tion. Furthermore, rubber can be com pounded to provide low water absorption, thus maintaining its high insulating factor, a characteristic oat enjoyed by most other insulating materials. Rubber msolatum finds its most use with electric wires and cables, although it has also wide appHoti<xi m connection with electro chemical proc esses where resistance to corrosion and to stray cuttoi* losses are both important. The ability of rubber to absorb vibration and shock i* doe to a high degrm of re*3tence. If displaced under load it immcdiatdy returns to its original position when the load is removed. The woieiuoxt is accomplished n*hb a minimum of internal friction. This characteristic enable* engineers to design rubber springs and vibration dampaters, a recent application of rubber that is proving very beneficial m many of the process indus tries. Rubber may be considered a good thermal insulator with coefficient of heat transfer corresponding approximately to that of .as bestos. Tins permits transfer of solutions through rubber lined pipe with small loss of heat content, and evaporation m rubber lined vacuum errstaHiters without excessive radi ation. On the other hand, low heat transfer precludes the possibility of temperature con trol by indirect heating in robber lined jacketed kettles or similar equipment. It be ing necessary to maintain temperature b) heating coils or direct injection of steam. Robber compounds vary in tensile stmigth from Z000 to KUDO lbs. per sq. inch, in elongation or stretch from 600 per catt to