Document evK9BJEe56qLmQk5banybZnog

ik l<r y Xn r ~ ' ' "" Ki i -qua?- ^rrrmrm.r'tfynomflon WJS'u'H RAriroiPrr. ?I3!'T,r'?P.i;AM3 CWFVBIPAMY imbtitute plamt r. o. nox ?m. ctmisroN. wrsi vtfr.ii.. i,K. .J. Sexton, H.D. Cir*iry Medical Department - l lant 512 o.i. 29 November 1%3 oritin.n<.| d.m- Iivlustrial Hygiene - Plant 512 ItHtf d**% CPfjf Hr. 1.. ii. Plcf: inson Mr. J. W. Parry **M Construction Insul.il ion Mop Mr. 11. s. Eastman Mr. F. E. Henry Building 511-20LH ______ Mr. . > c. C.inmbruno Mr. It. A. Heal > .^j- ~~ Mr. u. A. Huber Mr. 1). P.. ltitheny'-tfc` M- . It. r. Ping Mr. 11. H. Kctcliam IV. i:. M. best Mr. L. B. Weddell - Safety Dept. tv. c. u. T- :mehl Mr. F. G. Comerford In accordance with Mr. P. E. Henry's request of nvirsdav, 7 Uov 53, I have investigated the fabrication of "Carey-Temp" pipe coverir.r,. 'Ihis operation is carried out with band saws arid, on the basis of visual observation alone, it lias been decided tlvat there should be no health lvtr.ird .iscociated with this particular type of operation. K f' .' Tliis investigation took place during the morning cT T)rnv-v' jys J!i !! 'v l>3, in the compiny of Hr. K. B. Lanham, Foreman of tire Fabric,it.ion insulation !.-hc>p, and consisted merely of observing the process of the cutting of lnlf sections of eight inch diameter "Carey-Tcirp" pipe covering with a 1. m i .saw. It ) el fort was made, at that time, to determine the actual, concentration <>l .'tjinspheric dust being produced during this operation. It: should not le w scary to perform this specific test so long as working condition:', -no n a .'.It' v:l appreciably from ttoso observed on this date. However, a marc th .rough '.illation of these condition:: will be performed if (1) i*- is rj.e : 'r i aPy '.polled. (2) nnj'loyecs begin complaining atom reactions such n n > * '..'l, it . , (3) a thief:--!' material, i.e.,more than two inches in diam'i' : m ' itutc.l for fabrication, or 00 the fabrication shop logins cu* i. i--.- s eh ui- '-I In If-sect ion from large blocks of "Carey-Temp". Very truly yours, <7? ' *r f 11. K. lycb' Industrial Hygienist. V) l lV A 2 4 0 5 r\ O UCC 016130 O !i.i; l. rue Lion Insulation Shop - building r>Ll--2018 Report 63-111-3-G-l t A SUIliV\1'Y; . lh<' Construction .Insulation Shop (Building 2010, Plant 012 location, r utii.. 1 v fabricator, largo quantities of insulation block with ventilated tun! nr::;. Hus mote efficient procedure of fabrication has replaced an. older, live 1km.red, pract:ice of using, simple Ivuv.lsaws to do the job. However, it has, at lie same time, cirated a 1/ uLth hazard resulting from exposure to excessive concentrations of utnospheric dust. The Ituzard to health lias l.ocn evaluated and ruport p> ' d''usly ' v.'ilh the result l_lx.it one material, "Thermobestos" was clearly idont: f ied with the h.v.-.uid (exceeded Tl.V) and anotlier material, "Kaylo", was safe to fabric He (v.ithin Tl.V). The. pivsent rcqort (the third on this subject) was initiated in an attempt to supply answers to three basic questions: (1) was there any rr-'>r in the original evaluation of "Kaylo", (2) can supplementary exhaust vx.' i 1 d ion induce the "TlKnvv'L-xstos" hazard to within safe acceptable .limit"., an 1 (3) i' a ha sard to health produced in the fabrication of a third material, i.r:,, "Carey- Temp". . ' r ' . j.I. r The information uncovered in the present evaluation reveal the following facts: 1. "I.aylc" insulation blocks can lx: safely fabricate I with the existing equipment. 2. "Thcrmober.tcs" insulation blocks cannot' t<2 rd'-lv f t! r i-rated ol . the present time with existing equipment, but could ' safely fabricated if the exhaust ventilation is improved. 3. The TLV (Threshold Limit Value) for "Curey-T1 mn" is Identical wi th that: established for both "Kaylo" and "Thenrol.- os", i.c., 20 mppcf (million particles per cubic foot) ol air. . "Carcy-Tcm.p" also cannot be safely fabricated ;:i .h th existing equipment, but could be if .improvements-are mu', in ventilation system. S. 'I he original "downdraft" exUiust vontil ation rale;, : fit her land saw, do not meet the reconmcnded capture vebwii.y rate of H,000 fpm (feet per minute). n. The supplementary "overhead" oxluust vent id.a I bn mm I'tli bind . :.r.;s, is an improvement and t lie rates do mewl: 1 !i i -mm aide I capture velocity rate of ll,000 1pm.* * 1.11. lV joi l:; 02-111-1-0-1 and G2-NI-2-G-1 UCC 016131 A2405 * I J be "1'a.iyjo" insulation material lml to lie re-evalu n < I 3. The Const ruction Insulation Shop requested that a n<:v: insu lit ion material, i.e., "Carey-Temp", be evaluated. lli.: investigation of 6 Mar 1963 was conducted liecauso 1. The Construction Insulation Glop recently Kid installed i supplementary exliaust ventilnt ion on Loth Lvuv! r>r.::; and. desired to know if this additional control met hod would re-.luce the "Thennobestos" dust concentrations to within safe acceptable limits. A comparison of the reasons listed above discloses that each was ililCerent in content and concerned actually with different investigations hit ill. wore interrelated in part, i.e., each was concerned with the same environment, t.l.e same location and the same specific methods of fabrication. C:\nse') .i. ntly, the sampling procedures, utilized in each .instance, basically were identical and in accordance with the following condensed explanation: first: Two methods of fabrication, i.e., cutting and edging, , and cutting a radius, wore evaluated at each land saw * r since this is standard practice followed in the fabrication of any insulation material. Second: The environmental conditions of both preceding r'ports, i.e., 62-IH-l-G-l and C2-IM-2-G-1, were duplicate.1 in that all cutside.doors to the building were closed. Third: Each dust sample was collected in the operator's breathing . zone as he worked in the fabrication pro-cess. fourth: The complete fabrication of "Carey-Temp" insulation blocks -was evaluated in two ways: First, with all available ventilation in operation and second,with only the original downdraft ventilation in operation. Gp'cialized sampling procedures were utilized also 're.;- ;vtion:.: ( I the 1 ittvr tvs investigat ions, in an endeavor to evaluate Uv- nt irv i-xiuust: 'Mitilat.ion system which had been inst illed as recoinm-nd-v ', 'i wure ns Collews: I'i- t The complete fabrication of "Tlvimobes-'oe" i-sut it ion bfo-'k:;. v.ms- evaluated in two wtv;;: fit St, wi.tb il' i' I able ven i i bat ion in operation -ind sc' <>nd ,w.i.l b '-nly ! i - * original, downdraft ventilation in operal. ion. ft .ond: 'Hie complete fabric.it i'-n of "Car-`,y-T-,:!i| '' ii l : -i i Id; Vs was evaluated while utilizing all available ::h . i t ventilation. UCC 016132 A 2 4 05 2 M. J l. is necessary to explain that "Kaylo" insulation Mocks worn net included -r? a pu t of this evaluation since the initial investigation, (performed \ without supplementary exhaust ventilation) disclosed only ona exposure exceeding tlw TLV of 20 mppcf of air and, tharofera, it could be assumed That any ventilation that might be added should be more than adequate in controlling the hazard. EVALUATIONS: } A, Atmospheric dust exposures: .. 1. The concentrations of inhalable dust, present in the breathing zone when fabricating any one of the three types of insulation materials, were determined in accordance with the following procedure: a. Three locations and nine different conditions of exposure, as described on Page 9, were selected for evaluation. b. Atmospheric dust samples were collected through the use of the impingement1' principle of air sampling. The midget impingcr apparatus (described on Page 5 ) served as the instrument of use. * 9 i c. The concentration of dust collected in each sample was cstuLlishc-iV r Ii through the use of standard light field microscopic counting . techniques as described on Page 5. 2. 'The size of the particles of inhaled dust was determined, for bath "Knylo" and "Thcnrobestos", in the initial survey of 1962 in accordance v.'ith the procedure described on Fage 5. Consequently, no effort war, expended to ' repeat the determination for any of the insulation materials since the sawing tecliniques as well as equipment, i,e., saw blades with three teeth to the .inch operating at 2200 linear feet per minute, were identical cn i . loth occasions and, therefore, the size of the particles should not be **1 expected to deviate to any great degree from the prior recorded values. 3. 'Die composition of the dust, i.e., percentage crystalline free silica or ik percentage asbestos was determined for both "Kaylo" and "Thennolostos" i . in the initial survey of 1962. Consequently, no effort was expended to i rcpcat this determination since the materials used on loth occasions, were reported as being identical in composition. However, since the composition of "Caroy-Tomp" was not established at any earlier date; it was deemed imperative that it be determined and reported at this time. This was accomplished as described on Page 5. B. local exhaust ventilation controls: ` 1. The velocity of the air being exhausted through the ventilation h-a I openings on hath hand saws {ill and 112) was measured through the use of a V Model 60 Anemotherm air meter. k; 2.- Four variable conditions of interest were evaluated: i" a. 'IIio velocity of air through tlie downdraft hood on both saws with all p.. ` other floods on the system closed off. * This means to strike against, as (in this application) the striking or dashing of atmospheric *r: {fust particles against the hat tom of a small impinger flask containing a specific volume of dust-free water as a collecting medium. ' . A240o3 t >* - *r \ 11/i i di '< 'i 'I I! i I: A > i<i' , : Ml Mii.l I o'! in lln'ch l`JO-2, stated that <m. inh i1 -if. i-n Ivi.-n i 1 ii illli piv j.n the Construction Insulation Slop wltanovrr "rtM jii'sii tation Ldooka ve I abricaled. In July 19G2, a second sinvey was conducted f in ordor to evaluate three new "Thermobestos" mifcrlals which had b-jen r.'.iiipliotJ ' hv l.lv.> minufaclm ') for evaluation. This survey revealed that, alUr-i| h llie inlnl.ution hu/.ar.l to health had been substantially reduced fboin lint : v inter1 1 during, the first survey, the atmospheric dust ccnrcnti-ations ben.-, *.r.-: i:: ' I during f il l-icati.cn of thc:e new products, were still in excess of the Tin- shijd limit V.ilu.'s au designated in the first report, Therefore, all reconmenduiuns .Iv/uhl lU'Liin exactly as stated .in the initial report of flu'cli 1%2. Ilf', n mufacturer and Union Carbide's Pure Inning l>-.-p t * u -i i expressed i 1',1'Ml' <!<.'- 1 ot concern alien! the findings revealed in this initial report .'nun if v.ms uncovered l.l*it. the ininuCacturer's Research Department also l.i 1 evaluated these milerialr. in ! was not aide to produce resul ts comparable with fIvir: reiifainc! in ihe tvp-.rt of f.u'ch 19G2. Tliat .is to say, the atuosj h"iic -lust con a nil. a lions r.*por!ed lay the manufacturer, when pioccssing "Thcrcr. T'-rd/ s" in-.ul.it ion klocl , w to substantially higher thin those reveal/' i in ! "i i s t y--lll-l--f'--.1. Hi is revelation disclosed the need lor a more extensive, ev ihuit 1711 cl this piviblem s .> as to resolve all differences of opinion relative to the r alm'-spheric dust exposures in this environment. ^.r This decision in favor of further evaluation, prcreli ! 11.j preduction of a much nore extensive study than was originally planned, .1 study which eventually encompassed three separate intervals of dust sum,-ling, miLysis, .and cvalution before all of the unanswered health problems ecuId 1 1 resolved. DlSClK&lOil: Tlrim i hree inv''Si:.igal:ions were actually initial ed for the gvnvr-'l p-n ,/ver. of loth clarification and identification - pur|oi.elv for cl.iri.1 ic 1' v n icIimI 1 v),vjj \1 to health (if any) connected with the fabrication of flu/'- different insulation nuteri il"- and identification of acceptable measures lor u.v in reducing all. exposures to within safe acceptable limits- I ! vwnvcr, each invest i y, 1'. ion occurred for clearly identifiable reasons as explained below: l'h" investigation of 24 Jan G3 was conducted bcenu; : l- ili" Johns I'unville Company m limit tod 1 rc|:'M . ' i.-v th ir Research l'<qvirtncnt, which c"ii! lined data th \ 1 ! 1 si!; that submitted by this depart m til in Report 1 I ' -1 2. Thin dep u tncnt desired to clarify the reasons I- : 1 I isorcpincy lxitween the two reports .m l In ! 11 v , : 'V.'i li" aclmt conditions as tlrv "xisf in fie > ' :n\ v r-'iim-1P . II,. i nver-f i pe I ion of 25 and 2h ! h I'd v 1 : .m.lu'l' I i- : 1. In I lie 11. 'ceding invcr.tig.il i >11,I lie tv. ' iiv n! ionr 1 ills in quest'"ii, i.c., "Tlicnnol e: !:> .m l "1 17J0" v; r b'l'od i 1 idv"ri;ciiU.y durijig tlie sum- .1! t-ernoon, a 11 ' ` n vhi.h w is not in keeping with an all-mpt to spimul if" 11 :'ivlitinn ! tlie ci ig.inal report. In ' II* original repn : , 1 n i Mf.-nun! is walnited on separate occasions to a:: tv | 1 . i.lud ' i * I ' u.il'i.l.i I 7 that any one sa q l.e might cixitaii. in ; Heed lv Loth iterations. A24054 UCC 016134 Yri**.vr ' i. V*f 1 V JttHtTSI n i ?.nnAi,, wtnrti?.ptn!nrJOW CO.C373!l?.rri u-- UNION CAnniWK dSflSPfllCAtJB COMPANY institutb plant t. o. eox 2A3I. chri[sion, wist viffcim* u{H**+> Mr, S. C. Giainbruno C*nMf tr<*ih* Industrial Delations ** 23 October 1963 opf-MeJical Department - Plant 612 c*rr * Hr. Mr. v,. U. 11. fo' Dickinson Ins(man Mr. B. A. Huber Mr. P. r. King Dr. i;. M. Post Ur. c. IJ. Dctnchl An|wrlnf UHr rfolt Hr. JJ. W. l'erry ivij.fi . Insulation Block Djst Suivcy Mr. P, Construction Insulation Chop Mr. R. Plant 511 Mr. n Mr. II Mr. L. B. Weddell - Safety Dept. k -r Diclosed is a very excellent and veiy complete Industrial Hygiene report on the potential hasardousness of "Thermolxistos", "Kaylo" and "Oarov-Tcmp" .insulation blocks which lave been processed in the Construction Department's Insulation Chop. The rejort points out definitely that "Thmrober.tos" and , 'Tarry-Temp" insulation blocks cannot be fabricated safely with existing equipment, hit that "Kaylo" insulation blocks can be fabricated safely. Mr. Peele's Tvconmcndaticns are quite definite and I am sure that you will wish to comply with them. I believe this, particular project should be considered completed. If there are any comnwnts, suggestions or criticism, please direct these to ire. Very truly yours, ivi;;:hi. I.nr Ic-.utvs exton, M.D. Medical Director J M & . UCC 016135 A2405b #t \ I-, ill'.; velocity of air tl trough tlie clo.iv Iraft lwod on loth saws with .ill other hoods on the system open. c. The velocity of air through the supplementcry overhead liood on both I saws with all oilier hoods on the system closed off. d. The velocity of air through the supplementary overhead hood on Loth saws with all other hoods on the system open. PROCEDURES hath sampling-and analytical methods were as follows: SAMI'Ll MG: 1. All samples used in determining the" actual concentrations in air were collected with a midget impinger apparatus, sampling 0.3 cubic feet; of air per minute through impinger flasks containing 15 milliliters of double distilled du3t-free water. 2. All samples used in obtaining particle size distribution data '..ere collected on millipore filters connected to a small battery-operated pump. : ANALYTICAL: 1. l'ach dust sample was evaluated through the use of a counting procedure referred to as the light field microscopic counting tccliniquo.--'- 2. The particle sizing techniques were derived from two separate sources. First, the sample was prepared for sizing in accordance with a permanent mounting method.+ Second, the actual sizing war. accomplished in accordance with the recoimiended technique depicting the use of a filar micrometer, and a standard microscope while using both the *3X (high and dry) and the 97X (oil immersion) objectives.!- 3. The evaluation and free silica determination of "Carcy-Temp" material was accomplished through the use of two methods. First, through information supplied by Mr. E. D. Ermenc, Director of Research of the 'Philip Carey Manufacturing Company and second, through c.ontv act analysis performed by Mr. Thomas M. Durkan, Chief Chemist for tie Tiudcau foundation, Inc., Saranak Lake, N. Y. PJ,CULTS: See Pages 0, 9, 10 and 11. :i Prinl-.'T and ll.ttrh: " I ndnsl rial Dust", 2nd Ldition, pp. .157-153, McGraw-Hill. !!> >!. Company, ]m;. , !.' w York, l'.)5*lt2. 3 * PauLiis, II. J., Talvit.ic, II, A., Fraser, D. A., and Keenan, R. G.: "Use of Membrane I'iltcrs in Arr r>.impling", A. 1.11. A. Quarterly, Vol. 10, p. 250, September, 1957 t Drinker and Hatch: " 1 ivlu.'/trial Dust", 2nd Edition, pp. 1GG-179, McGraw-Hill Look Company, Inc., New York, 1954. A2405 Ij UCC 016136 ; iM'.'IJ:'.: Relative to dust exposures from Graph. HI E Tables on Pages 8 E 9: , : 1. "Thcnnolestos" insulation blocks should not be fabricated when using only the original downdraft exhaust ventilation. 2. "Kaylo" insulation blocks could be fabricated safely when using only Inc original downdraft exhaust ventilation if existing leaks, observed on the 111 band saw, are corrected. 3. "Kaylo" insulation blocks definitely may be safely fabricated wb.cn using the entire exhaust ventilation facilities now available, i.e., hoods above Dio blocks as well as below. ` From Graph H2 C Tables on Fages 8 E 9: 1. Methods of handling "Thenrobestos" blocks (preparatory to sawing) and scraps (after sawing) contribute greatly to specific individual exposures as demonstrated by the following facts: -* , a. The fabrication process, which always begins at the II? land raw wi'tlf the simple cutting of each 18" x 38" x 4" block into three smaller blocks about 18" x 12" x 4", is normally the least dusty of all the fabrication operations as revealed by the samples taken on 24 Jan 1963. b. However, on 6 Mar 1963, this operation was revealed as being one of the dustiest, regardless of the ventilation being used. c. There was only one major variable between the samples taken on Die two dates, i.e., .the method of handling the blocks preparatory to sawing. Consideration of the procedure used on these dates reveals: (1) tint on 24 Jan 1963, the blocks were rolled up to the saw after having been removed from their shipping cartons and stacked on a "dolly" for easy individual removal and (2) on 6 Mar 1963, the blocks were not removed from their shipping cartons until needed by the worker. A large amount of dust is produced when blocks aw- removed individually from the cartons as a result of the natural aLias Lon produced when one block is pulled over the surface of the ether. Consequently, the dust concentrations on this date at this location were greater Ilian normal. 2. The supplementary overhead ventilation (added since Die time of Dr' preceding two reports) does successfully reduce Die dust' o.qosurcr;. ' However, it does not reduce "Thermobostos" dust cxjwsurcs to within safe .icccptal.de lim.its~w]7en cutting radii. From Graph 113 f. .Tabl e on Page 9: 1. "Caroy-Tcmp" dust concentrations for each exposure was substantially greater than the comparable "Thermobostos" dust conccntr.itions and in excess of even the most lenient TLV established for liumon exposures, i.e., 80 mppcf of air. UCC 016137 A2405 .< * I k-l i 2. 'Iti-- i inf* oxluust vent il it ion systevi an installed on loth bind wr. i '/> incapable of reducing the dust liazaivl, aosoci a tod with the f.ihrical. i n of "Curey-Temp", to within safe acceptable limits, i.c,, 20 mppcf of air. Relative to the exhaust ventilation system: 1. Hie duct velocity in the downdraft ventilation system on loth 'i"i rows > is far below the reconmended value of 4000 fpm. - 2. The duct velocity in the overhead ventilation system on both bind saws is equal to or more than the recommended value of 4000 fpm. 3. The velocity in the downdraft ventilation systems for both bind saws could be increased by patching all holes, leaks, etc., now in existence. RfXOtninmATK'iJo: 1. ivi not. fabricate 10" x 36" x 4" "Carey-Tcmp" or "Thcrmotostor." insulation nviterials unless: a. The atmospheric dust problem can be reduced to below 20 rpref of ain through the use cf improved ventilatibn tccluiiqucs or repairs to existing system, or b. The minufacturers of the two makes of insulation materials are able to produce a product which will not release, upon fabrici`ion with a band saw, dust concentrations in excess of 20 mppcf of air. RLT:hl 23 Octol)or 1363 Submitted by: n'hu. c 7?7T7Te5ir^----------Industrial Hygienist I' I .5 t .................. UCC 016138 A 2 4- 05 8 /t . Ev.ilu.jt ion cl JiinuivnuAi. irvr.niui; purvky Almosplieric Dust Conditions at tlvj Construction Insulation Gliop Table //I Atmospheric IXist Concentxation Data Collected When Using Only Partial. Ventilation,,i.e., Only Below the Blocks n. , ' i- Cutting Edging Insulation Blocks Cutting a Radius on Insulation Blocks Rite Type of Miterial Mir r>? 25 Erb 03 Mir 62 2't Jan fit 6 Mar 63 Mir 62 25 Feb 63 Mir 62 v 2'* .till 63 ' 6 Mir 63 Kaylo II ThcmvoLcstos II . II Kuylo II Thenmbestos II II Description of Location //3, i.e., South Side of 11.0 112 Bard Saw #3, II If ft II It 1! 11 If 113, If 11 tt 11 ff If It It 113, II I 11 If It II It II 113, If II 11 If 11 It II If II", i.c., South Side of the 111 Band Saw II" II 11 II 11 If If If If II", It 11 It 11 11 VI 11 If II", If 11 If ft It It 1* II II", II 11 It It If II It It Concentration in r[>pcf 17.10 3.30 ini.H0 60.50 30.02 3.00 20.35 03.30 60.60 70.03 UCC 016139 A24053 V lull6 Kir M 26 Bob 6J 6 Kir <1 26 lob 6.1 Ta'de I! 2 A'm.v pin l i." ['"i: ' C iiconlf it. >n Data Collected V.lien bring Ml Av ulal>J e Void i l-ition, i.c.f Both Above Z Below the Blocks t ;* Cut tins', r. Edging Insulation Blocks [ c of t'.itn\i.il Thermnbo'Jtor. Car<'V-Tc;np Thcniol Ctrcv-Tcti-p Description of location 01 n, i.e., South Side of the 92 Band Saw jj] ^ II O * 11 11 I* I' ii //'i, i.e., South Side of the 111 Band Saw II II ' ! II II II II II r. :neentr..t.ien in nprcT n.ro 51. 'n 17,53 01.20 Oitting a Radius on Insulation Blocks Dile '(vpe c f II iter in] 6 Kir 0.1 6 Kir 0.1 26 l'eb (.1 26 Bel. 01 - Thennobestos TheiToIiestos C.uv.y-1 emp Oil ey-Tomp Description of location 1/3a, i.e., South Side of the 112 Bond Saw //'la, i.e., South Side of the 91 Ban! Saw 11 V ' " It 11 M 95 a, i.e., Morth Side of the 91 Band Sav: vr ration in irppr.f 22.H2 51.70 05JI0 100.MO Index for Craphs 111, 112 Z I! < Sou111 Side II ? 1' im:l Saw - Cutting Blocks - Vvnl iLition bid ; Bobo /n .. M. ./' l: 1 11 M II 11 n 1; : 11 r i 11 II II II tf 11 - edging "- - Cutting a Radius _ ,, " '' n it it 'M , II 11 It 1* 11 M ' 1 1 t 1 it: ti I* - Cutting Blocks - 11 ' I'olb /!) C B -li.; i. 11 . /i i n l 11 II VI It v; H it *1 . - Cdging " -It - Cutting a Radius II / i l 1 11 11 M . l 11 * ' n ti m it it it " ii ii t if Sa 1 Kvlli Sid.- VI aid Saw - Cutting a Radius - Ventilation Boll: A1->V" ! Below UCC 016140 4240SC "n---------t~nnn _ ' V I rial i> 1 2 3 Trial V 1 2 3 J ill.! I!3 h i.' tv^nil.i.on of I'ciccnl'ge Crystalline Itce Llilica Prevent in " Ih''niK>l>Col n:?", "Knyjo" "Cnrcy-Tcmp" iG Q'l.irtz by tk? "Talvitie" Method 10. "Thenrobestos" (As Contained in Report 62-Ili-l-G-l) Uj in Crams t'2 in Grams W3 in Groms 1 Tree Sj02 O VOO* NJ 1 0.5000 0.5002 0.0390 0.0347 0.0396 0.0069 0.0060 0.0082 Average Percentage Crystalline Tree S^02 = 6.11 6.4 2 6.50 6.20 "Kaylo" (As Contained in Report 62-lIi-l-G-l) Vr Wj in Grains V.'2 in Grams '.J3 in Grans " lire 0.5000 0.6000 ' 0.500!) 0.0807 0.0730 0.0563 ' 0.0433 0.0364 0,0190. 7.110 7.32 . 7, nr, Average Percentage Crystalline Tree S]_02 = 7.'1 "Carey-Tranp" (As Reported by Mr. Thomas M. Durkan) 4 October 1963 : UCC 016141- ^<-406 I ' 'I 'Ho Ventilation fetes on Two fend Saws I I iVite Hood being Find Saw Cl tccked Description of Condition Vent i1-.tfi.on fete .in fp'n 25 lob 63 G Mir 63 25 Feb 63 G Mir 03 25 Teb G3 6 Mir 63 25 lob 63 Mir 13 25 lob G3 6 Mir 63 H2 112 in. H2 in i/2 in. in. 112 II2 Downdraft tl II II It II Overhead II M It Only Downdraft System in Operation tl II II It t Downdraft 5 Overhead System in Operation l If II ftv II Every Hood in the System Open II II II II It II Downdraft E Overhead System in Operation II II II II II ft Every Hood in the System Open II IP II II II II 1500 l'i50 1200 1200 050 900 1-500 i500 '1000 r 25 Tcb 03 G Mir 63 25 Fob 63 G Mir 63 25 Fob 63 6 Mar 63 25 Fob 63 6 Mu' 63 25 Fob 63 6 Mir 63 II1 "L III 111 111 111 111 II1 111 II1 Downdraft II If It *1 II Over! lead II 11 II Only Downdraft System in Operation II It II II II Downdraft 6 Overhead System in Operation tl If II II It II Every Hood in the System Open II II If tl If It Downdraft E Overhead System in Operation (1 If It If II f Every Hood in the System Open If 11 If If If If 21 m 1503 1600 11 50 1100 5 500 Minn 6200 UCC 016142 A 24062 I'oncom t .jL ionu in mppol of Air ?< H1 * * S P*rE F^S mmc p o r t i f ptrvc i f !;1 Vr`: lxa 3aaKhA i ...o.* *Q O 42 4-063 UCC 016143 ItJ ror n /< in > "s r* O --l.t 0 V X m r* N; XJ ao (3 ,, *V 03 m in *-< a xj 001 > **1 -i Z i/ <* c m* `I p *> i -4 i* o o o Q XJ >. a X z O \ Concentration in mppcf of Air o % o ** o Wl o o* 6 & 2 4 Jm t.3 *S PE 'i**'.* ** pi , ; " *^ifjr U ill.-, ist.i.t, 1A H 6 Itur 6] C Htf 63 I i=L 24 Jan S3 iiisiuT^ liar 03 6 Mur 63 oo liivr 62 S P * ^ \ i S P -* t * u> 5 Tr a IA i < 6 CJ 3 CJ - 1- ,,< 2 I*0 il srs r CJ o 5 jj* 2 I2 Xa *i* --< A 24 06 4 UCC 016144 Jt.r (2 o Xc m 0*1 ki -i & 0 IV+V-*\1' o3 bJ m 0 l/ m i v_.* O 3fJ tn Art I/I 5"U m u t* C O Vi r X ha. r r < `VI wi -Jly** -i o X i.j K |rjl Ui n Vs* r~ . V "I 0 -1 n>a a > o j1!. * i. f/; o O w > *u X oX W \ c Concern.rat ion in mppcf of Air w ** u oo o o -o4 .o.. o*.. ( A2406b UCC 016145 Oi HI 9 (/* l>\ NJ in o 8 L/t C & h-* u 0 a V > < n ic i_i*> O. + "i m * ->* a 'X> * .. m mS .!> '/I <./*+ I *1 , t ' / *r 2 C o a