Document 06o5QyQQnRQwXDK63qJek0M0n

FILE NAME Talc TALC DATE 1972 Apr DOC TALC404 DOCUMENT DESCRIPTION Notes on Seminar on Asbestos Supplementary Notes Supplied to the Attendees of the IITRI SEMINAR ON ASBESTOS April 4-7 1972 IIT Research Institute 10 West 35th Street Chicago Illinois 60616 Tuesday April 4th Chairman - Dr. Colin F. Harwood Morning wrt 9:00 - 9:30 Registration 9:30 - 9:40 Opening Welcome 9:40 - 11:00 Introduction Dr. Harwood 11:00 - 11:15 Coffee Break 11:15 - 12:00 12:00 - 1:00 Introduction cont'd Lunch Dr. Harwood Afternoon 1:00 2:00 2:15 3:30 - 2:00 2:15 3:30 4:00 Medical Aspects Coffee Break Dr. Nicholson Medical Aspects cont'd Dr. Nicholson Questions and Speakers from Floor Wednesday April 5th Chairman - Dr. Colin F. Harwood 9:00 www 10:15 10:15 - 10:30 10:30 - 11:30 11:30 GW 12:00 12:00 - 1:00 Afternoon ' 1:00 - 2:00 2:00 2:15 - 2:15 3:15 3:15 - 3:45 3:45 - 4:00 Legal Aspects Coffee Break Legal Aspects cont'd Questions and Speakers from Floor Lunch Mr. Tim Harker Mr. Tim Harker Plant Control Tech- niques Coffee Break Plant Concentration Levels Experience of Good and Bad Practice Questions and Speakers from Floor Dr. Harwood Dr. Harwood Mr. Nathan Willens Thursday April 6th i Chairman - Mr. Reg Reg Reg Davies Davies Davies Davies Davies Davies 1ITRI ASBESTOS SEMINAR gen AGENDA Page 2 Afternoon 1:00 - 1:45 1:45 - 2:15 2:15 2:30 - 2:30 3:30 3:30 - 4:00 Basis for the Occupational Exposure Levels Worker Protection Aspects Coffee Break Mr. Duncan Holaday Worker Protection Aspects cont'd Questions and Speakers from Floor Mr. Duncan Holaday Friday April 7th Chairman - Dr. Colin F. Harwood Morning 9:00 - 10:00 10:00 - 10:15 10:15 - 11:45 11:45 - 12:00 Monitoring Thecry Coffee Break Standard Methods of Monitoring Questions from Floor Mr. John Stockham Mr. John Stockham production Total US production 1969 valued at an estimated 10,648,000 was 125,936 tons The United States utilizes about fourth of the world's production of asbestos practically all of it is imported from Canada and Africa Figure 1 graphically illustrates domestic supply and consumption 3 ASBESTOS EMISSIONS 3.1 Industrial Sources Before entering into the main source of asbestos emissions that is through commercial manufacturers processes it is worthwhile to consider briefly other less mission sources These may be listed as obvious but important 8 Rock Outcrops e Farming 6 Construction fi Talcum Powder 3.1.1 Rock Outcrops It has been pointed containing rock outcrops out previously in Table 1 in very many areas of the that asbestosUnited States It is interesting to note that in 1920 Staten Island was once considered a large enough outcrop that mining on a commercial scale was undertaken there Emission from such outcrops will occur due to the natural eroding processes of earthquakes temperature wind rain Thus wind and borne erosion contain asbestos particles products will inevitably 3.1.2 Farming Farming of the soil in areas containing asbestos rock will cause the emission of the soil are always dusty fibers Such actions as tilling of operations unless of course it happens to be wet the extent of the emissions will depend on IIT RESEARCH INSTITUTE 4 the concentration of asbestos in the soil Studies have been conducted on the effect of such emis- sions on the health of the local population The evidence though not very conclusive suggested that asbestosis could be caused by agricultural employment 3.1.3 Construction The outcrops of containing rock will give rise to emissions whenever construction is undertaken Hence such activity as excavating for housing pipe laying and road making must be considered as a source 3.1.4 Talcum Powders Talcum powder is a mineral rock dust very closely related mineralogically to asbestos The main difference lies in the fact that talcum powder is characterized by its has a platy morphology fibrous nature while asbestos The fact ficant fibrous that talc is very content now leads frequently found with a signito a very important situation since the total quantities of talc mined in the U.S. exceeds that of asbestos |: metic It was pointed out by Cralley that the majority of cos- talcs contain significant quantities of fibrous particles Virtually everybody from babies up is exposed to cosmetic talc and so are exposed to the threat of asbestos bodies Apart from the ably in industry as in the production of Another large use is of crops cosmetic use talc is used very consider- for example a filler and as a lubricant pharmaceutical tablets and rubber goods as a carrier for pesticides in the spraying On a more exotic note there on the use of talcum for polishing with stomach cancer because of its has been recent publications rice and its association asbestos content Even more 11T RESEARCH INSTITUTE 6 Te a Doe oe ug inet children may be endangered by 2 tte ee in ou. be balloons Ces above discassion on talc has been included for com- should pleteness in this report concerning asbestos Certainly it not be neglnegleected cted when considering the health effects and hazard of asbestoasbestoss fibers Other studies discussing the presence of asbestiform fibers in the mining of talc are those of Siegal and of Greenberg 6 3.2 Manufacturing Processes 3.2.1 Introduction Several tasks preliminary to the manufacture of asbestos products are potential emission sources These are common to all asbestos processing They include such functions as unloading and storage of milled asbestos subsequent transport of the bagged asbestos to the bag opening area fluffing of the compacted fibers and a mixing process where asbestos fibers are dry mixed with other materials The bagged asbestos is usually unloaded from railway boxcars moved to storage areas and finally transported to bag opening areas by lift trucks Opportunities exist during each of these operations for bags to become damaged and spill fibers to the atmosphere The amount of emission from the bag opening and dumping processes depend upon the degree to in some instances the bags are cut which the open with tasks are enclosed sharp knives and the contents dumped into a container or onto a conveyor belt The compacted fibers from packing at the mill are fed through a willow or Moody fluffer which fluffs up and separates the fibers This operation may also be employed as a blending stage wherein several grades of fibers are thoroughly mixed HT RESEARCH INSTITUTE 7