Document pBGMaLrMBV1y6jKBbj3Vx4Zpj

fi I. INTERNAL CORRESPONDENCIi i..U'N CARBIDE CHEMICALS COMPANY institute plant p. o. box m\. chlusto:;, west vmc;:, mpofif olf Mr. S. C. Giamoruao Industrial Relations Do1' 4 December 19^2 o/igtnaiinf o.pi. Medical DepartmentPlant 512 *r Mr. L N. Dickinson Mr. E. G. Heinz Subi,t( Insulation Block Dust Survey to. G H. Daniels to. ?. E. Henry Construction Insulation Shop Mr. N S. Eastman Mr. R A. Huber Mr. R. A. Heal __ Mr. D. R. totheny-^KS Plant 511 Mr. B, F. King . to. N. H. Xetcham to.- F, B. Snyder Dr. C. U. Dernehl Dr. E. M. Best, Jr. Two reports by Mr. R. E. Peele have been issued on this . subject (21 torch 1962 and 20 July 19^2) and sent out under my signature. On 16 toy-1962, a copy of a letter from Doctor Nale to the UCC Central Purchasing Department in New York pertaining to this subject was sent to some o.f the people on the above distribution list. Undoubtedly, Johns Manville is extremely interested in having our Construction Department use their "Thermobestos" blocks. Eowever, X believe that possibly unnecessary pressure is 'being applied to us from several sources. The enclosed report by Mr.. Peele includes information on. an invitation for Mr. Peele to visit Manville, New Jersey, at Johns Manville's expense to evaluate their industrial hygiene studies. Mr. Peele points out in this report also that he has been contacted recently by'the Design and Construction Department at the Technical Center who have implied that to. Peele should comply with Johns tonville's proposal. 'It is my opinion that we`should continue to do surveys, with limitations, on samples of "thermobestos" blocks that are of a new formula and are submitted to our Construction Insulation Shop at the Institute Plant for evaluation. However, I am not in favor of to. Peele accepting Johns Manville's invitation and would appreciate approval or disapproval for this trip from my supervision so that to. Peele can be informed accordingly. Very truly yours, n RJS:gh Enclosure 1 . ;r v ui'jg'm.' -asizv iHi irw..r 'in. m !* it? R.L?. Sexton, M.D. Plant Medical Director INTERNAL CORRESPONDENCE n JmON CARBIDE CHEMICALS COMPANY INSTITUTE PUAHT P. 0. 8CX 2831, CHARLESTON, WEST VIRGINIA - (N<n.> g '. r. j. Sexton, M.D. Medical Department Oftf to Doit ^ December 1962 0/iji'no/Mg d.pi. Industrial Hygiene - Plant 512 AntwitiOQ Uu*f dot* Svbiict Johns Manville "Thermobestos" 1" ' -- n r r"r 11 " ' " On 21 March 1962, an Industrial Hygiene Report, i.e., 62-IH-1-6-1, identified the existence of a hazard to health in the Construction Insulation Shop during such times as vhen insulation blocks manufactured by the Johns _ Manville Company are being fabricated with exhausted band saws. It was recommended at that time that 18" x 36" x 4" "Thermobestos" insulation blocks* should not be fabricated with the existing equipment unless -- . (a) The atmospheric dust problem could be reduced to below 20 mppcf of air through the use of ventilation, etc., or ' (b) The producer of this product begins manufacturing an insulation block which will not release upon fabrication with a band saw, dust concentrations in excess of 20 mppcf of air. In accordance with these recommendations, the Construction Insulation Shop discontinued almost immediately the' purchase of "Thermobestos" insulation blocks. `' On 20 July 1962, a second Industrial Hygiene Report, i.e., - 62-IH-2-G-1, -was submitted subsequent to an evaluation of three new insulation materials supplied by the Johns Manville Company. This report concluded that these materials were.improved over the original. However, the dust concentrations produced upon fabrication of these insulation blocks were substantially in excess of the recommended safe concentrations of 20 mppcf of air. Therefore, the ' recommendations contained in this report remained exactly as those stated in the initial report of torch, 1962. On 20 November 1962 the author was contacted by to. D. P.. Matheny, General Foreman of the Insulation Shop, who stated that three Johns'Manville representatives, i.e., Messers. F. E. Saxer, N. Gordon, and H. E. Kaufman, were present and had requested' a meeting with the Flant Industrial Hygienist. This meeting was held in the lobby of Building 2, at which time Mr. Saxer produced the accompanying copy of pcrticns of a report submitted by the Johns Manville Industrial Hygiene Laboratory located at Manville, N.J. to. Saxer stated that, in accordance with this report, they were not able to produce results which agreed with those contained in the reports submitted by this department. Therefore, they were concerned and interested in learning if their methods of reproducing *The Johns Manville trade name for their insulation blocks R. J. Sexton, M.D. 3 December 19^2 . Page' 2 ' . our environmental conditions, sampling and evaluating the dust concentrations contained therein were subject to question. At this, point he stated also that this conclusion'was promoted on the basis of their analysis of the atmospheric dust conditions produced by their competitors-product, (i.e,, Kaylo or Item # 5AT in the report) which in no way agreed with the data submitted in the Industrial Hygiene Report --IH-62-I-G-I. It was explained at this point, that this department's interest in this problem is always confined solely to the environmental conditions as they effect the health o'f our workers, and that no part of the investigation should'be construed as an attempt to arbitrarily promote the use of one company's product over that of another. Upon completion of this statement, Mr. Saxer proposed that Mr. D. R. Matheny and the Plant's Industrial Hygienist make a trip to J-Sanville, New Jersey, at Johns Manvilie's expense and at a time selected by Union Carbide. This visit would be for the specific purpose of observing, scrutinizing and comparing their method of atmospheric dust evaluation with that as utilitized by the Institute Plant's Industrial Hugiene Department. It was Mr. Saxer's opinion that such a visit would permit a more positive approach to the problem and remove the possibility of misunderstandings, etc., that results from written correspondence. At this point, Mr. Saxer 'was assured that there would be no n personal objection on. my part to the performance of such a service. However, .a proposal of this nature would have to be submitted to the Plant Manager, Mr. L. N. Dickinson, through appropriate channels before a final decision could be made. In conclusion, it should be stated that a phone call was received from Mr. F. G. Comerfcrd of Design and Construction on the morning of 21 November 1$62, who requested that he be brought up`to date on this specific problem. This request was immediately satisified both by verbal'explanation and by the promise that copies of both reports, i.e., 62-IE-I-G-I and 62-IH-2-G-1, would be mailed to him immediately. Mr. Comerford further stated that we should not back down on our requirements, but that it probably might be wise to consider their proposal in light of the many ramifications of the problem as it affects the whole company structure, i.e., purchasing, sales, manufacturing, etc. Very truly yours, ' REP:gh Enclosure Robert E. Peele Industrial Hygienist 1 P? {?'" iH'rr/M* r-ric . *. ! C OwC C [] jtC <igv :do ca Cniccer jQ, 19 , ~i r* `> * i:v;ul^tion blc on ih: DC--ILL Model L-H-V ennd ecu in E.istwc.i Co/'.'.ur Materials '/os`.in? !>-.cortt*or*' or.:-,pie pri.fw.t'tr. roox 'Moo Motional Con-or0.0:0 o' Governmental Industrial Hygienists Toot Method tbo Greonbu ga-Saith iapingcr. Too to vcrc contiuotod liy Hr. T. F. EadnarehuS: of tbo 0"-,M Indus trial Hygiene Laboratory at HanVi.ila. To obtain comparative data, th. boon ventilation v.us adjusted to giro r-orc tbo uan.il amount of ataoephorii dust, Tbo teat up is shown in tbo photo- graph bolou. <, . 1# 1 r "if ; ! I i*. israsrrrrsrr r- *" lA^aH <*0 tw J V** > ,.< - K*,/ I, s, J M1..J 4 W J >.S> la W* U*a W* M ^^ `* "J ^** w* `-f ^*W*t* ***. 4"**'** O> a^ ~^ .J>* aWw ^** /"i ---* --/ M-a- ^ .wa a lah1 a'*. H- -#~'JO. 4 or Cr L:iiraid *-rcro out co -- * V*>Ja ...,. .a v aWa,.t.*. 'W ~^ _*W. i *a <W* Aw x il -^n!' <>J- U* ' >< * W^U^a.m*m--a*i Ua4 .*./wy,U^1 X V *.aa*.a* a, /a I^-.IT. * ^^"*,,. wa *l."a! -C>v-.a'.-* ---*- TmO{5 <. ^*J?, *,,a that the blr-docatered the il-ia. cdh's. ' --t test dots. arc giroa droraids: II. The dust csc.:snt:r.it.'.sa tests r::-: airl;--:.d rod lzdiostod that tic ouroricrdl^ rcjcri-rd 07 t/oica r.--;' t'~ cf ' <;vc" -A----* - ^ lacr.a-j-.ictoc cod the as^srioes.-b-.l p.-.n cast blscbs sal-aditcd to tie- io subject to ^crsti.sa. 'o.s --suits also laddaciirri chat tbs r.lr.ic duct ccoTociticn, 2-47, ccuac.'. loss atocsjhcioo coot thr.s: tie otist* ij^us 01 blocbe. * -- error-, that ccsdlticai.'v; or Sht hl.T-chs bad os tio dart cicaoutrstica J- -t-* 5~ S-W -ww**,--w vw**-*-- vw t-u**--.. -- w 15-- .w QiUJ g iJS*0 C~~-!'-^.T ~y ~. C V*--C- ci* tests uould 'bo required. Cash tests wiuld tiro servo to rare dorisitcly cstoblio: ' tho r-olaiivo ductloses cr tho-ferrules ltvcofi''r.<:cc. r' i-.j4>.-15f7 n TJ'fu^r 1 . JJ.7;T.? S;R7:'.V r'. xx-sji'xc - xildi-vO 511-2018 p.L7'0nT SUIL'AHY ; The iniyutrial hygiene survey, evaluating the dunt pr the Construction Insulation Chop (Building 5I1-::GV;) processing both ``Themcbestcc " and "Kaylo" insul..tio.: completed. The results of this investigation reveal conclusive facts; . First - The T.L.V. (Threshold Licit Value) for this rater-- 20 nppcf (Million particles per cubic foot) of air. i Second_ - The fabrication of- "Theraobcstos" insulation bloc;:; ' band saws produces a definite atmospheric hazard to Third - The- fJofScution of "Kaylo" insulation -blochs with c. docs not .constitute a hazard to health. Vf UW <y> Q oc-en n P An IKTRQDUGTIQI'I; On 15 'November 19Sl, Mr. S. H. Wilson, Construction B..ivcy !Lv.ji.v.-or at Plant 512, approached this department with a problem uh-t h.d teen brought to his attention by way cf employee complaints. He stated chut tr.v _ "band saw" operators locatc-u in the Insulation Chop-(Building 5!+-3l5) were -upericncing some-rather uncomfortable working conditions a.: they performed their normal routine of ripping "Head Segments" frer. star.uv.rd 18" x 36" x 4". insulation blocks. This concern was apparently initiated by virtue of the fact that -two insulation materials, reputed to be identical in make-up although produced by different manufacturers, did net react i.-. similar manners'to the identical sawing techniques being utilised by th., 1 shop. According to statements obtained from the operators, heavy quantities of dust of such large concentrations as to seriously interfere vita tacir ' normal breathing process, were immediately produced if and v/hon "Tn-r.r.ob-utos1 . blocks (a Joiino Munvlllc: product) were supplied for saving. Soma dues also- resulted whenever "Kaylo"' blocks (an Owens Corning product) were hcailei . in a similar manner; however, the quantity of particulate ranter being produced from this latter material was hardly noticeable and never objectionable. This interesting introduction to tne problem at'.mulcted a desire to visit the location in question and, while there, to cbta:in as many answers us possible to the numerous unanswered questions that came to mind upor, cm: completion of Mr. .Wilson's .description. A visit was .-.rrangei and the 'r following facts were noted: (l) ,-ost of the i'ab.,i.c..t .o.: o.raiptiisit was connected to a well-known and apt... v.ntly adequate dust coliuctcr by r..aar.s of well constructed duct work. (:) This exhaust system had obviously been designed to cope with the norral dust problems encounter;! in most band saw operations. However, th,.- band saw operations in evidence on this date were not what might be termed normal, a3 a result of the specific " shape of the insulation material being fabricated and the particular manner in which each block was being cut. These conditions ruled eve th;. possibility of the exhaust 3ystam operating in accordance ..ch its pre-dusigned' efficient manner. Figure 2 on page 15 hue L . Induced an an attempt to demonstrate the manner of processing those h..auks .-,i;d the position of the exhaust hoods in relation to the blocks during fabric';.tic.;. > n- (3) >d...... liv/ulatio: was vcr.t. . . . ovc by means duct s.... 1. -a to be taken evaiumtis:. would be made and when both ''L'licrxcbestos" and 1 processed separately. ^r.op j* ?* L dirt . w* 3.t/ 0<>* * i ^ ,' ^ * ** r* ii***4 <JW* k<tw f\ ^/ uCi .v>< nc cr* >O\>ju! *" . . **> ** * n- n DISCUSSION: On -he morning or 21 Novc/djer 19ul, the Initial air campi:-.: wore- ".I::-:, in want proved to be but the first part of a tv.-o-phase- program of due - evalia/uLor. ./. thic location, This firot phacc was r-cpor.oibic- for disciorir.,; the actual c oncer,r.rutlour, of duct (in :.:iIlian: of r.urcicL:.a p..r cubic .`cot of air) to which me various man wore be-Lag at' -'jc-st^d as tr.-.y fabricated first "Thermobco ton" ur.d than "Iliyic" with band cars. 1 `Atmospheric samples of the /,`rusrisobei:tos''.du3t exposures '..-era tnk:n on thin initial sampling.date whereas similar samples of "ifeylo" du:;t exposures were, = of necessity, tabor: 01: 11 joco-mber IS>5l, since thane tve products are not^processed uimultan^ounly. . Five genor.: 1 areas, capable of revealing a:.-- moot comprehensive ir.for.v.:t:.an relative to ..ay t overall dust exposure, wore initially selected and sampling points then spotted in these areas in lee..*.ions' deo~.v.d important. The sampling locations are displayed in the Shop -v- ,r.-.ir. ravealvd on p::;y. 7 1 Thu impingement* principle was- utilised in the colr-e:-cn of th-.o<- s..:.r;los with the widget Ir.pingcr apparatus (us r------rod to 0.. .ju d ) serving the instrument of use. total of thirty.:.. -umpius we.*.*, taken with Thefirst seven being indicative of ,!Thcr:r.obo-ntos" exposures uni ths latter cl:: loins representative of "K.aylo" exposures. IliCh i;J th.:;c dust cample:: were avalu-.tcd through the use of light fi..-3i microscopic counting techniques, referred to cn y--ge i; , with f.u. result at ` disclosure that sexe of the locations were quite heavily ccr.t:::r.ir.ai...d excessive concentrations' of dust.' This d isclosure- rendered it imperative that more descriptive information would have to be obtained before an accurate evaluation of the conditions could be formulated, and no thesecond phase of the program was initiated. Thin second phase had the decigned purpose of supplying two types of . physical data-relative co these exposures: (l) the percentage of crystalline free silica present in each material, and (2) the particle sice ' distribution of the air borne portion of each material. This infcr.vu.tior. was 'deemed essential as t result of the following well-known facts i relative to human dust exposures. It iu an uncontcsted fact tllat prolonged exposures to excessive ccucer., trutions of certain types of atmospheric dust will result in the production of. cither one of two, or possibly even a combination ox' both, typ.s of the following lung diseases; i.e., silicosis or asbestos is. It ''... ,.l..o known that there are five specific factors that directly influen the - . production of these diseases. They are: (l) the composition of ..a duct; "Thi-c naans to strike or dash again./:, as (in this application) the strihi ; c-r dr.ching of atmospheric-duct particles against the bottom of a small impi:per flash containing a specific volume of dure free water as a collecting mc.-.-u.*... 1.2., percentage crystalline free 2il:cv \ .' ...'.t::, .*_ If; . numbcf particles of inLuil..d dust, (3) "*- -' ' ' i:V. '.ust, (t) the length of time during \.':'.ii:h ... . ir.j------- and, (5) the individual susceptibility cL w-.e.. 0 -!' 'it:. id Since the determinations revealed that so:::;; of the ..orhe:;: v.re eirposei to dust concentrations of such racnibvdos ls to 01: ..--.cd ev_ post lenient of till dust standards, i.o., a 2.I.V. (i'hru-h ,1-L Licit * -. of 50 mppei- of *alr (sec table below - entry Hi) and cir.ee i~ has r. revealed (nor a Johns Fanville r'-'('re-sentative on .*:! !!cvv:.`: 1C.-/1; this material contained 12.0 - 13*0*1 asbjstcs ./if. the r Ga.O - Gp.C',/ beir.g entitled, calcium silicate, teen it b_v...:: i.-.,-r ' that conclusive. Information be obtained which would idei. '.i'y e:-.-et yn.u.'e. values for two of the five specific factors listen above: l.o., the percentage crystalline free ailica present la this material Isaev.-. as calcium siliMlo and the'exact particle site distribution of the :--..pir..r.l portion ..oh .rateriu.'.. The following criteria van used in th-.- evaluatio., this data. , Tne actual percc-n'... ;e crystal!:ne free ailica cr p.reo.v. . asbestos-found to be pres-rnt in a min-*-.;l cr r.on-notnllic inr.r;-r.ic dust furnishes the basic Information a:.. ted in the establish-, ayof a 'i.L.V. for the material in quest ic..:. 'i'his 'colnctior. is arrived at in accordance.- witn criteria follc.fs: 'f.L.Y. in tv.psei of Air 1* * 5* . SO* 1 .. 50* .5* ` Substance Silica' as quarts ' Silica as quarts Silica as quarts Silicate as asbestos Limiting Conditions High percentage crystalldn-i- fret.- silica, i.o., abow i Medium percentage crystallise free silica, i.e., 5 to 5C'.: ! Low percentage crystalline free } silica, i.e., below 5$ | l High percentage asbestos, i.e., above 50$ j j 20+ Silicate as asbestos i Medium percentage asbestos, l i.el, 5 to pC> 50* < Silicate as asbestos Low percentage asb-ztes, : i.e., below * A.C.G.I.H. Threshold Limits Values for 1951, pa3c 11 (April, l$ol) + Warren A. Cook, Personal correspondence, 21 February 19o2. { | j Second: "In--- ir-':tion of an inhaled dust which is rave. in the respiratory -yutum and the depth to which the dust ntr.vs.s are sensitively related to particle size. Thus, the si-, .aster is a primary one in determining the magnitude of hazard .sccciazs.. r n . -- ir.hnl.vl.Lor. of v-ritiaui:.!:.- mat.:.:*'1*. Ls v. b. H ' * pni* C. XCI L-` SL'.il:, 1 --.j Ci UT.'.l V - ..: is revealed in 'Mu. foiiouir.;; t:.kl:: ryavriCLS size t. j Above 5*0 microns 1.0 - 5.0 microns j 1.0 micron - ' * 0.25*7 1.0 miorc..*..! Am OF DEPOSIT v^(>" i-- f'.l.Z-'.r.r. I'OT.l.ir.I. | t ij **'** - 1 v. _ ' r^.ap:.rr.vory .c | Or--uo olvcoLi ; 1 Alveoli (most optimumi .L'.trxr/.j ; i ! > else for alveoli | j rote., hie...; { `! f :. , | --itr-.- _____________ l__________________ J r* \ n n> The actual procedure vac atu.v-c.-d on fi Sea*..:'i>cr 19oL, a- '.v.xch .. t`./o typos of samples were obtained. /'rut, ;; bingi. almasjv.ovi.: suxnl-: of "JCaylo" dust was tak':.. ' . uvea of c.r.ni suvs ."-i. c.:.l ,{'3, -hrough the j of a Hillifc..- ' ap.: r_-f jv.ud u: o.. , -' jC 4 ; and pi-i^iclc siclct uv-- , cv .* r.:i *co on p--y: t chen used to d'-termine the: particle slue ci. e.-louticr. of ck '..-.lo. Second, a direct cample of the- .icie.xl re .to.-inl uv..; collected and llti.r analyzed, lor crystalline ire.: sillc-. :y two r--Uicac, i.c., M-ruy diffractioa and ti.u l_tont \.\.t chc...s-iai 11 technique, both Hated on price: 5 . Or. 4 January LyZ'l, t*.;c ::;... ;:1 of "Tnermobesto::" dust wre also obtained and evaluator for to:.. percentciGc ory.:t...ilinc free silica ana particle'clue dxstvihtticv 'in a manner ia...:':ical with truvt used on the "Kaylo" material. I' PROCZDUR'Ef: Doth sampbinG and analytical methods are as follows: Snr.nlir.s: (l-) All samples used in determining the actual ecu: me ratic-r in air were collected, with o midget impingcr apparatus which hard-cracked, four cylinder suction pump dravine 0.1 cubic ft-, of a!r per minute through iispinger flasks containinc 15 milliliters of double distilled dust free water. , (2) All samples used in obtaining particle uiu- CietvLluiic.ciata were collected cn Milliporo Filters connected to a cm11 . -.:ccvy operated pump. These Cellulose Ester filters arc recognised . .iv.f *fr moot efficient and adaptable filter material available on ths ...rket today being capable of retaining particles dome to and below 0 is. size. 'It;leal: (l) The actual countinc technique, used in this . referred to as the Light Field Microscopic Counting ?ccr.r>.i.eue, .... ..ccurately described cn pages 152*153 of lain..trial Dust cy E.-iaa 1 j. U. Ex*own, K. Cook, ?. G. is'oy, and Theodore :latch, Public Health, VoL. 40, No. 4 (April, 1950). v iean O- (2) The j ii;' f. v-i :: v` . Trc..: - - sources. _ First, the sutv'dr Tv-' ." . T:i ptiT.ir.eiVu i ng t.sithr/J. ry.rev.Tj, ho wv. > : -. i:T ' . .. issue oT the A. I.II. A. Quart,'rlv, ;l.-oor. thw act.' .1 accompli-hud in accordance tnoi ivcot.v.v.'l.1 ccchn,'.::'. . dee-via paces 163-179 oT Industrial Peat by Driny.tr <. s'-v-i: vh:e:. vep.'-ts i vac of a Filar micromotor, and a standard rv.o- r.a....v; ' the 63X (high and dry) and y/X (oil in^.-rj id.) .. (3) Frets silica detr.-rai nation; ,n: pvc.... -1 vl.v,,\,\ . cf both cf i!iO two following teoh.VM'vu. Fivt. . 7"S-- entitled, "Determination of Quarts ; the iV-: c-T : . T: - Phosphoric Acid" by K. A. lalvihie, ilivisiwi- .1.'' ... U. S,. public Health Service, Cincinnati, Ohio, .'..eta . ' diffraction techniques ar, described in the cncyujopod.la of "1..... :i -r. for Industrial Hygiene", po. and us p.:rTtr:.*.ed by Tv. J. L rsh;, Research and Development Department, Instru.r.inU.l Method a Oreup, h-.il'v. Carbide Chemicals. Company. .. RESULTS: The physical data listed in the appendix wore ev-T.vv-.'.d and folloving facts: '- ` led ' (1) The composition of the dust (Table $5, pact 12) is. (a) For "Therrr.obestos": (b) For "Kayla": Asbestos a 12.0 to 13 .Cjj . , Crystalline Froa Silica' 2.5- 1 -0 6. Asbestos - 12.0 to 13.0>'j Crystalline Free Silica * 5.ot 1 to (2) The number of particles of atmospheric dust (Table revealed to be: . . pvjv - ) it (a) _c, greatest concentration in er.d around the fi ..ni j'l c._r.i v-v.:-. (b) I-'- greatest concentration when "Thermobestos" is being iVs.-icaoed. (3) The particle size of the atmospheric dusts in question (Graphs 1 ar.i 3, pages 13 and Vi) is demonstrated to be: Predominantly 1.0 micron in size for both "Thermobasuos" ,!:b.y'_c`!, but slightly smaller in size for "Kayla" than for "T-.aru.cbestcu''. (4) The length of .time during which the particles are inhale, demonstrated in Table 2 page 9 ) reflects a weighted rurv.ouior. iv. the overall dust exposures to both .-.nterials. (5) The individual susceptibility is, ir. this case, one of thv-c . unmeusurcable human factors which lends special emphasis to the. e-si for the conscientious use of adequate protective measures ds_-.r.cn essential in the prevention of these incurable diseases. I I i* o cc.:;cL::.'rc::c: SO r.vjpcf (Millie.:: psrticl-.... per cubic foot) of air. (2). The greatest so health is experienced when prosesair.;: e.-.ly "Thcr;..V.:..-szo::" blocks. (J The hing ventilation control dev60 nos cc-.'.b:"- , tin.- :is.,i problem baing cr.-itei '..hen ......-actesse:;" blscl.e or. .-ise-.A. (h) TL. `.:j:eed e-xncouru at shi. v.h. V.I..V. `. b.-.r.i ... :... eliuV.-'r- .:i -.::e .. (5) The Jaiiard to health, expur:.-::>:..d ..'..an fabricating only .'i.yl;." .>-oo:-..: is nesli3iblti.-- ' . (6) The environmental conditions in uvidence, errir..': th: tin-.- of s.'.if survey of the fabrication of "ICaylo" bloats, -..-ere not hossrusus to health. '; (?) "Thermobootos" blocks should not bo fabric:, a:-.. vlth any existing band saw unless a more effective ventilation sy :s x.\ is dc-sigr. installed in such a manner.as to render it eatable of reducing th.* inherent atmospheric dust concentrations to -within safe .and acc-.-ptsbl.. limits,. r.ECC'.OaHDATIGhS: (a) The atmosphere dust problem can bn r--f-ced to colov CO mspcf cf ' air through.the use of ventilation, or (b) The producer of this product begins ..nufaevarir-g an insulas_on 1 block which will not release, upon fabrication with a band saw, dust concentrations in excess of 20 rr.ppcf cf sis-. R. E. ?cuie Industrial Hygienist r\ 1 n n tJi >O h it c. o o? 1 0 58 8: Im w Oj p <Q .0 3 h w z 0 o IL 2. / / I: /I /; \v.-- i i I I S3a fe w _ a OJ oo Jftd. S-* WO4 Cp0--m3 Ci Qr0?3 f*, O Id P _oSMi.<d_. Wioa 3 Para aa tqao_ 3o_w_d_P' m tv, q3 Mit, ho ->h< -w. @t. .. ; qS^; w.c wy** 3o !=-> .<5 si * ! Im O C 1/3 0,. O a 1^ Jh 5. ^ ? S it} id o |J ^ ?. a S g Si % 5 :j; h M *1; 3? '*i w 5 f1 P $ 3P g o C<4fl COt; 043 0*53 C*4/3 id flt? f/; Ea m h 3 m 5#-i* C; ft * H MMM WO p ^2 2 2- O2fcO2m1hnt>. j. d u Li d d d .-! P*ati.: A^Pi -Psb.i' & m*C *P\i M;J 1''0* 03 W 03 03 ft O O 00O0 . INDUSTRIAL HYGIENE SURVEY . """N EVALUATION OF ATMOSPHERIC DUST CONDITIONS AT THE CONSTRUCTION irSULMIC" VMZZ * , ' TABLE 1 n1 Atmospheric Dust Concentration Data ------------------------------------------------------------ - ' As Collected with the Midget Lmpinger Pump & Apparatus Type of UU3 \* ..`laterial No. Location i SAMPLE Rate Time Vol. 31ank # Dilution Count ,, . ' in in in Particles Factor Farticlcn t; ".cT cfm Min. C.P. 0 '-.ormobestos ]_ #1 Band Saw "Mitcheli" 0.1 10.0 1.0 vhile sawing ` - . 8.0 250 5-J.c . If 2 #2 Hand Saw "Bennett" off beaming . 0.1 10.0 1.0 8.0 250 105. t a*. 5 If tr n it tt ir 3 #2 Band Saw "Raines" while sawing 0.1 10.0 1.0 h #1 South Grinder 0.1 3.5 0.85 "Dunlop" grinding fiber glass pipe covers . a '5 Band Saw "Samples" sawing "Kaylo" head segments 0.1 10.0 1.0 6 G. A. (General 0.1 10.0 1.0 Atmospheric) south end of Shop 7 G. A. North end of Shop 0.1' 10.0 l.o. 8.0 8.0 ' 8.0 8.0' 8.0 625 50 . 20 . 50 51.* . 73.3 i.V L 15.1 1 ' ii *I 1 37.2 ! 13. L r. K i 95.5 i t r1 20.1 ` Kaylo II It >1 n ii 1 #1 Band Saw "Mitchell" 0.1 10.0 1.0 while sawing. I, 2 //2 Band Saw i'Bennett" off bearing 0.1 io. o 1.0 5.2 5.2 3 #2 Band Saw "Raines" 0.1 10.0 1.0 ' while sawing | 1 5 #3 Band Saw "Samples" 0.1 10.0 1.0 1 cutting radius on head segments 5.2 5-2 6 G. A. South orid'of Shop 0.1 10.0 1.0 * 5.2 7 G. A. North end of Shop 0.1 ' t. 10.0 1.0 % 5.2 | 20 ! 1 20 i 50 20 1 1 1 20 ! 20 | I 1 *57 0 ; 3.C-: 503 ; )1 79.6 j i 59.5 23.^ 1 i 1 . 15*0 ; t Lw4 ^71 , 7.0^/ 1.7 j' * *\ *. * i 1 i` TAELS 2 ' SUMMARY OF 1*0 -HOUR WEEKLY WEIGHS? EXPOSURES AS EXHIBITED BY FIVE WORKERS EMPLOYED AT BUG. 511-2018 1 1 t Worker* i "Mitchell" t Length of Expose re in Hours Per Week* Concentrations in mnncf of Air i ... To Both "Thermobestos" & "ICaylo" To Only "Thernobestos" iTo Only 1"Kaylo" 1 "Thernobestos" "Kayla-" "!L* /V*-; * **: ,x*~'. jir. if lo.O 6.4 9.6 83.3 3.1 n .'(.v-l Band Saw i Ripping Blocks) * ***** 1 "Raines" '(;/T Band Saw Ripping i 31ocks) .. l6.0 i "Sammies" - '(13 & ft ' .Bind Saws - i1 : -Cutting >*VJLu8 on f\ ad Segments) 16.0 ' . \ '* ,6.4 6.4 ' _) 1 9.6 ' 101.4 `9.6 .1 13.1 17.1 7.7 j I it 3*-` "Bennett" ,(,,-2 Eand Saw Off 3earing) 16.0 . 6.4 i 9.6 84.5 4.5 lb.<3 ! "Jordan" `CA & ft .Land Saws Same as | "Samples" ' 1 SAME AS SAMP! ES 1 i ! | * 1 t . i il ? 1 1 1 1 : 1 f 1 1 * These workers were selected for identification upon the suggestion of the Shop Inowlitiur. Fabrication Foreman, Mr. D. R. Matheny, who stated that these particular wan prove to be . the onds most exposed to high concentrations of this air borne material known to the trade as "calcium silicate". + These hourly exposure values were derived on the basis of the following estimator also submitted by Mr. p. R. Matheny: 16 hours a week are probably spent working with loth products (i.e., "Xaylo" and "Thernobestos") with about 40$ of this being "Thar.nob..utc::" exposure and 6o "Khylo" exposure. The following general formula wa3 used in deriving the values rer .-r- i to above as weighed exposures: /' \/ \ /Conccntratic: ..r ,,., ,, / Concentration of }/ Number Hours ofki of "Kavlo" ~ Weighed Exposure 3 \"Thermobestos" in mnncf of Air/\Daily Exnosure /* ir^-r n^' - * 1 -. in- mppcf of Air 116" Hours Per Week -----'' ' 1 n TABLE 3 / '` "TaEr'I-'.Lr.E^TOa" ?ARTICL5 SIZE DISTHIEUTtON U3jE:S tr.IH TgE' 43>' L 97X CXL PSS3SIOK OBJECTIVES IK COI-SIKATIQW KISH A 12X FIU-.H LYE/I.r;:: I r\ n TABLE ly "MAYLO" PARTICLE SIZE DISTRIBUTION USING BOTH ~AS U?.X fc 97X OIL IMMERSION OBJECTIVES IN COMBINATION WITH A 12X FILAR _ O.O;.! UjM OR 5lo MAG. WHERE 1 FILAR DIV.'S' 0.2 MICRONS ]'9TM OR 1164 MAG. '..HERE 1 FILAR 017.- r\ O I TABLE 5 . DETERMINATIONS OF THE PfflCEKTAGE CRYSTALLINE FREE SILICA PRESENT IN BOTH "TKZRMOSSSTOS" & "KAYLO", AS CUARTZ, 5Y THE "TALVITIE" METHOD "THERMOBESTOS " -........ t TRIALS Mi in vf2 in iv/3/in r i hies GRAMS GRAMS ' |GRAMS S102 1 1 0.5002 0.0390 O.OO69 6.42 ,f "KAYLO" TRIALSK ili * V2 in ' [GRAINS GRAMS ' 1 0.5 0.0807 W, in GI*AM 0.0423 t* ***-. SiG^ . 7.be l 1 I 2 1 0.5000 0.0347 0.0068 5.5B 2 0.5 0.0730 0.03cb 7.32 i 3 0.5002 0.039^ ,0.0082 6.23 3 0.5 O.O563 0.0190 7.46 r\ Average # Crystalline Free SiOg 6,4 Average $ Crystalline Free Si02 7.b nP Determinations of 'the Percentage Crystalline ' I 'Free Silica Present in Both "Thermobestos'* & "Kaylo" by the X-ray Diffraction Method* ' "Thermobestos11 i "Kaylo" * 2.5# + 1$ 5.6# t 1# ( ` i, i *This inlorrration obtained and reported by Mr. K. J. Garska, Research and Development Department, Instrumental Methods Group, Union Carbide Chemicals Company. ' ' I ii I P a r . T t c u a 3S iz e *j M ic r o n s O \ i fi FIGURE 2 C'jt-cway Side View a: a Dend Saw With Ventilation Provided. -y-