Document bBX5LZZkLVgwY7qB4m7LDO8y

FILE NAME: Caterpillar (CAT) DATE: 1958 Apr DOC#: CAT035 DOCUMENT DESCRIPTION: Recommended Asbestos Standard - Published in Industrial HygieneJournal '>r, -lii i. ippiemcnt lire ami handbook mi. D. C. Pharmnrramum >ok Co., \X C E : iii brief lATION rs to - are: polish tem`II ES: -i may ** |f6" lllcl, ter as 'nuta I techalnat mib*'*ied, Ii or fin Industrial Hygiene Journal c . iu:<x)M M K xni:n c o n t r o l jito(.'KDl'RES: To prevent- r\|wMtrc in high concentrations of mini plmiw silica dust, prove.5 vaiiiSaiinn and/nr en- closure art* flu- Itest mean.- nf control. For some opcTalinns a dust respirator approved by tin- l \ S. Bureau of Minos piny be satisfactory. IV. Specific Procedures A. FIRST AID: None. SPECIAL MEDICAL PROCEDURES: (1) Preplacement: Clinical and rliost radiographic examinations should 1 made on all jwrsons prior to job assignment. (2) Periodic: Since there is onlv lim ited information about the harmful effects of amorphous hiiica in in dustry, exposed ix*rsonnoI should have careful jxriodie medical ex aminations, including chest x-ray. Pulmonary function testing may lie useful. (3) Treatment: Xo satisfactory treat ment other than removal from rxjw ure, and therapy for any com plicating infection. 01 V. Literature Reference- L ........ it. W. ei al; Industrial !fy. nene !*otiiidattou Transaction Bulletin No. '>, IS2-HM. 2. IhciNKtai, I*, tsi Ilvreii, T.: Indu-tm l Dust. .Mi-Craw-Hill (;0., l nc. New York, l'.la-J. ' 3. Fihskii, I). A.: AMA Arch, o) ml. ami Ore. Med., S: 112. J95.3. 4. I-.'.MtuK, .1. S.: ml. Med., 7: 470, y.3,\. 5. P.w.ioAiin, A. ami Cou.kt, A.: AM A Arch, nf ml. Ilyg. and Oee. Med., It: 3S0, 10A4. 6. SniKi'Kiis, (!. W. II., et al: AM A Arch, of ml. Health, 18: 125, 1057; ibid, 18 203, 1!I5;; ibid, 18: 2M), 1057; ibid. 18 303, JO:. lllirf i n 409, 1957. 7. Smaui, 11. n am Andkiison, \V. M.; ml. Med. and iurg., 21: 509, 1952. S. T kbiikn-s, lh1), and Bkaiid, It. It.; AM A Arch. 1ml. Health. 18: 55, 1957. 9. U. S. Public Health Service; California Department of Public Health; Nevada State Health Department; Oregon State Hoard o| Health: Progress Hejx.rt of Rludy of Pneumoconiosis Hazards in the Dtalomile Processing Industry. 195,j. Asbesios I. Hygienic Standards A. RECOMMENDED MAXIM PM AT MOSPHERIC CONCKNTRATIOX (.x hour.-i: 5 million particles jx*r cubic foot of air (M IT C F).' '(1) Basis for Recommendation: Exiterieme in industry,* * " and ani mal exiieriment.s."-' B. SEVERITY OF HAZARDS; (I) Health: Long continued inhalation of asl>esfos dust result- in a form of pneumoconiosis known a.- site-- tosis. The primary efleet of inh.dation i- an interstitial pulmonary fibrosis. The disease is eliaracteri2,t| by aslfstos Ixidies in the lungs and sputum. Has>d on rocntgcuologiral examinations, asl>esio.-i.- can I f clas sified as minimal, mmlernte, and advanced. It is a seriou- disease in sime instances, but more frei|uent!y it remains tiondi-abling for many years, even without appreciable rymptouw, as long as soine other serious disease does not su|>orvenr to cause deal!).' Chief symttoms of advanced asbestosi- are variable cougli, dyspnea, sultstcrnal ehe-t pains, decreased chest expansion, weakness, emaciation, cluhlicd Un ger lijts, and curve*! fingernails. ,.\nv aiilireciablc deerea-e in the amount of asliestos dust in the breathing atmosphere will raiiso a decrease in the incidence and severitv of aslM`stosis. Individual sueeptil.ility varies.* There have lieetl re|Hrts of in increased incidence of lung can cer in |>erxoiis with asltestn-is.' (2) Fire: None. C. SHORT EXPOSURE TOLERANCE: Not applicable: JL Significant Properties A fibrous magnesium calcium silicate which occurs in v;iri**s cdmhisinfiiui^ greyish or greenish masses, either coin jwet or of long silky fibers, flax-like anil readily sejiarated. Aliout 95% of commerical asls-slos is chrysotile, which is derived from ser]>entine, ami is a hydrous magnesium ^ L~ .. . NOy 24 (f?o ; ____ K3LP.7 G. MEIKS TV 163 silicate containing from water of crystallization. to 14 per cent 111. Industrial Hygiene Practice A. ItECUGNllION: The spinning and weaving-of asbestos, in combination with other textiles for lire proof and heat rcsistaut cloth, result, in dust exposure It may be used by itself or combined with other materials for valve packings gaskets, boiler lagging and pipe cover ing, protective clothing, shielding ma terials, and as automotive brake huings. In the building industry it is used in the manufacture of asbestos cement products, heat insulating, and fire proofing materials. 11. EVALUATION OF EXPOSURES' As bestos dust may be sampled with the electrostatic precipitator or by the lmpingcr method using alcohol or alcohol and water, os the collecting medium * ami dust counts made by the standard gilt hehl technique.* ihe recommended cl`!iX|lm ,.1,,' Un0i,pllcnc concentration of 5 All 1 Q- is based ui>on the impmger sampling procedure. C' C `Vi'EOL PRO ORDURES: Prevention of asbestosis dejienils entirely upon preventing ex posure to concentrations of dust sulli- ciently high to produce the character- tic reaction. Enclosure or local exhaust ventilation arc the principal means oi i dust control. U. S. Bureau of Mines ap proved dust respirators may be worn as t v u pi? tef l,0D *or omc 0]icrations. iV. bpecific Procedures A. ITitSl A ll): None. ! ! ? r ? AL PROCEDURES- U) 1 replacement: Cluneal and radio graphic chest examinations prior to job assignment. (2) leriodis; Exposed ersonuei should April, 1958 Inch have periodic clinical examinations for signs and symptoms of asbes tos. These should include exami nation of the sputum for asbestosis bodies, and chest x-rays of rood quality. * (3) Treatment: No satisfactor/ treat- went other than removal from ex- P<wure and therapy for any com plicating infection. V. Literature References 1. American Conference of Governmental 1m ustrmj Hygienists: AM A Arch, oj Ind. Health, 0: 201, 1957 .h ` ` Health, I I : 204, A19i5u5. Arch- oi . m - 3. 1)01.1., it.: Urit. J. /,,</. iIed Jg 6 . PJo. ' 4. Duezsen \V. c., et al: Public Health Bulletin No. 241, Supt. of Doc, Wash ington, D. C , 1928. , 5' { S T ? ! * /' AND, liATC- T.: Industrial ' ihist. AlcGraw-Hill Book Co, Inc, New York, 1954. b. F ai.uau., Lawrence T.: Industrial loMcology. ihe Williams Jc Wilkins to ., Baltimore, M d, 1957. PJ4U ' ^ J '' Ct ^ : Tllorox P- S` ^ AI-: AAM ArcA. of lud. Health, J1: 1S5, 1955. . 9. McPueeteiis, S. B.: ( o x , IS; 229, 1920. J. Ind. Uyg. A W ji AK BLOOMFIELD, J. J.: * 11 v l t Uev th RCPU- 52: 17J3> 1837. x f A7 n Fra? k A.: Industrial Hygiene > *1, hr ,0XK0}Sy> 1. Interscience " I ublishers, Inc, New York, 1948. '1* K- W- AMA Arch, of Ind. Health, i t : 198, 1955. 12. \onwAi.n, A. J , et al: AMA Arch. Ind. Uyg. and Occup. Med. 8: l, 1951, The zckctionz Tavc b c c u m a Z ' n t ^ k k o t m m u " melho<j " ' l e*J*>iurt valuation, to th e v tu u l induzioni tu un ,,t espoture nu toa U*fC' and applicability z z z Of hazard n zzzztfitzdTzr1" cuntnd. P erm utent expozur and not r*" " relied upon pnrnary mzam J a W doof " M iA* oi hazard: n, W , modtm(C) ^ _ i'iV 4