Document dYEKk5gLQGRove0Om4abkKOxQ

(pll Plant Mr. G. H. Dan: . .s M 2. East., n 1*!': - E. A. Hub-: Mr. D. F. Kii. Mr. G. J. Rutc-iffe Mr. F. b. Snyder Dr. E. ;u. nest, Jr. :iz . .. P. E. henry ..r. 3. II. Vilsoh Mr. D. R. Maih-vry Mr. N: H: 'Kotcua.a Dr. C.- U. Dernehl 1 21 M.-rci; I'/oZ Medical Dennrtmor.t - Flam Insulation Bloch Bust Survey Construe tier. Insulation Shop Plant 511 __________ iC_- Inclosed is a report "by Mr. Pcele on tin Industrial hygiene Deparsmi-r.. survey of an .....-rtsioionn dduusstt problem which existed ir. the Construction 'insulation c *-op in the -...... ..ruction arc.; of Plant 512. In this report, Mr. Peel'-: points out t "Tl.icr...a b.-stos'1 dust presents very definite hazard to health ana I vrr.uid 111-.- to OiT..phasi ... e oh..-- tci*..- u v.l1.tt.iim.etaa t0ee 1outcome, aithoug.i it might take many years of exposure, VOuia b .. silicosis a the cm; yee3 .thus exposed. Free crystalline silica particle, from tnree nic. v. so one micron in size, or smaller, are capable of causing silica- in uni., home. ...a. -^protected workers. I . should be pointed out .hat as coon as lit -la made r.is calculate and discovert.. .:ie potential hazardous ness of "Ihermobestou'' oust, he notifies irvsr.ee '...telv the Construction Department supervision of his find cays, so that they .. use. disc;...; issue at cnee any further use of "Thermobcstos" blocks. Mr. Henry has aivinti me that "Thermobestos" will no longer be processed, thus complying with Mr. Peelers reccr.n.cndatior.s. The Plan 512 Medical Dcoartment been informed that ten Construe ors and one sal__ *j.cd supervisor have had exposure to '".'hornobestCc-u" Up- ..-date chest X-ray films will be ordered immediately on r.i tec- r,:*o* of .he exposed mer. will be followed periodic.,lly. Very truly youim, P.JS :gl Enclosure R./i/. Sexton, X.D. PlL.it Medical r f.ltort t r* i --.l SUMMARY The industrial hygiene survey, evaluating the dust problem in e isccr.ce at the Construction Insulation whop (Building pll-YOlo) during the tine of process ir.3 both "Yhermcbcotcs'' and "Kaylo" in; .'....tie.-; blocks, h. an completed. The results of this investigation a/eul the follow conclusive facts: I First - The T.L.V. (Threshold Limit Value) for this ir.atar_._l is 20 mppcf (million particles per cubic foot) of air. i Second - The fabrication of "Thermobestos" insulation blocks with band saws produces a definite atmospheric hazard to health. Third - The fabrication of "Kaylo" insulation blochs -with hand save dOv.s not .constitute a hazard to health. IKTRODU'CTION: Or. 15 November 1961, Kr. S. H. Wilson, Construction Safety If. Plant 512, approached this department with a problem that had beer, tc his attention by way of employee complaints. lie stated that th "baud saw" operators located in the Insulation Chop (Buildin;; $11-:201o) were experiencing some rather uncomfortable working conditions as 1they performed their normal routine of ripping "Head Segments" from eta:naara lS" x 36" x 4"- insulation blocks. This concern wao apparently ini virtue of the fact that two insulation materials, reputed to be id in make-up although produced.by different manufacturers, did net react ir. similar manners to the identical sawing techniques being utilized by the shop. According to statements obtained from the operators, heavy quantities of dust of such large concentrations as to seriously interfere with their normal breathing process, i/cre immediately produced if and when "Tharmobesto: It blocks (a Johns Manville product) were supplied for saving. Como dust also resulted whenever "Kaylo". blocks (an Owens Corning product) were handle! in a similar manner; however,, the quantity of particulate matter being produced from this latter ma -erial was hardly noticeable and never objectionable. This interesting introduction to tne problem stimulated a desire to visit the location in question and, while there, to obtain as many answers us possible to the numerous unaiswereu. questions that came to mind uses tin.* completion of Mr. Wilson's description. A visit was arranged ana th; following facts were noted: (l) host of the feb.-j.c.ctssn equipment was connected to a well-known and apt...\intly adequate dust collector by means of well constructed duct work. This exhaust system hue: obviously been designed to cope with the normal dust problems encountered in most band saw operations. However, thu band saw operations in evidence on this date were not what might be termed normal, as a result of the specific shape of the insulation material being fabricated and the particular manner in which each block was being cut. These condition:, ruled out the possibility of the exiiaust system operating in accordance .nth its' pre-designed efficient maimer. Figure 2 on page 15 has b . induced sn an attempt to demonstrate the manner of processing these k...ssks sad the position of the exhaust hoods in relation to the blocks during fabrics!Ion. n ` .3; >.'....... Insulation Chop was compi-ws].;/ open threw. ;h-.,.. -..v; vcr . above by means of six small reef Tuns. {) ,'.t.m:uv...--.r.' --a to be taken in various areas of the shed, be-fore s r.y evaluaticr >:c ild be rc.de and theco would, of necessity, hove to be tax when Loth ;:i: irmobestos" and "Kaylo" insulation materials were being processed sot rately. DI 'v^< u-- --r' EON: C.i the -corning of 21 Hcvciubcr ISol, the initio.c air campies wore on. in wrst proved to be but the first port of a tv/o-phase program of dust evaTu.uLor; at this location. Thi:: first phase wa.0 Z*tiCjjT*s -- ^_ CJ* diselceir.,; the actual concentrations of dust (in cubic .foot of air) to which U10 various :::on were fabricated first "Thermoses t-es" and then "Kaylc" 1 Atr.osph.eris samples of the# "'rhermobestos" dust ox pocures v;c-rj or. this initial sampling,date whereas similar sample,s of "Kaylo" dust exposures were, = of necessity, taken or. 11 yeser.be:r 1961, since these t\ products arc- not processed simultaneously. Five general areas, capable of revealing the rsc.st comprehensive .afore. relative to anysoverall dust exposure, were initially selected a sampling points then spotted in these areas in lcc..vions deem-d The sampling locations are displayed in tha Shop ai..pram roves.iu The impingement-'''- principle vac utilised in the coli..cs 'on of the. with the i-iidgot - Irapingcr apparatus (as rn--red to c.. .jo- d ) e the instrument of use. a. total of thirt-a.. -amples './ere tahen v first seven being indicative of "Thermobcstos" exposures and the six being representative of "Kaylo" exposures. Fa eh of ih .sc dust camples were evaluated through t'no use of i . ,..imicroscopic counting techniques, referred to on p...ye 1 , wit disclosure that seme of the locations were quite heavily ccr. excessive concentrations of dust. This disclcsun rendered it im that more descriptive information would have to be obtained bofor accurate evaluation of the conditions could be formulated, a:ni so second phase of the program was initiated. 1: eJ i.-SU] This second phase had the designed purpose of supplying two types of physical data relative so these exposures: (l) the percentage of crystalline free : ilica prosant in each material, and (2) the particle distribution of the air borne portion of each material. This. infor..u.ti was 'deemed essential as a result of the following well-known facts , relative to human dust exposures. It in an uncontcsted fact that prolonged exposures to excessive ccaeor.tr-tions of certain types of atmospheric dust will result in the produs of cither one of two, or possibly even a combination of both, ty._s of the following lung diseases; i.e., silicosis or asbestos is. It ... known that there are five specific factors that directly ir.fluon the production of these diseases. They are: (l) the composition of n :..eans to strike or dash again t, ao (in this application) the strik. cr.e rg of atmospheric- dust partic .os against the bottom of a email imps: : containing a specific volume of dust free water as a collecting me.'. 1 or ;,o I pore ,ta"o crystalline free sili w. c: r..:;d '-./.o'; , nuato r* cf p_;.rticles of inhaled dr.ct, i./.. V*- .. j. , (U) the length cf time ( 3) th 0 d urir. ; 3 i i:.. . a- 1 0 - .... and, (5) the individual sueceptibil.it;/ Cf v. ..o;. -. 1 0 -; . ~" c. Since the do terminations revealed that 3 Cl'Y'-J Ol' a *. vror-.cro v.'cro o_o . e::poc most of 50 ed to lenie lr.nuc dust concentrations of such 2iao. of all duct standards, i. f of*air (sec table below - 4'---!_>** o., a entry itvdo 3 L. n 7.. V. 7/j \; a:v0. s to c*>: (`rorc--;* coed it ;/io revea icd`( po r a Johns Mar.villc repress lit stive on .11 I.'CVer.b _r . oo-:. -o this meter 2 -- 1 contained 12.0 - 1';.0',' a 0 'J 0 3 o CO `.'it: I ..p 06.0 - 09. Op being entitled, calcium s ilici. uc, tin.-a it 1,3 -0 that concluc ive information be obtains-d *.:hi ch v:ould idui. 1 i*v oi.^co p.V- value s for -1.,>./o of the five specific factorc ii sued OCCVC * - o. j w--; percentage c rystalline free silica pre3 ent i.2 this ,**> * * i kr.cvf- an calciwa si] anil ino oxac^ portion -...ah- material. 1`iic following criteria was used in evaluation of this data. fd\.t: The actual percent-.go crystalline Tree silica cr asbestos -found to be pres.u'd. in a mineral or r.cr;-ac.-tailic duct furnishes the basic nformticn needed in the cctabl of a T.L.V. for the material in quostie.:. This select ior. arrive! at in accordance with criteria an follows: V n Second: "lae fr.r:ticn of an inhaled duct which is reva ...d ir. the respiratory -/stem and the depth to which the duct netrns.s are sensitively related to particle sice. Thus, the sin. faefor is a primary one in determining the magnitude of hacard '.ccceiace p I I6 .........particle site, the following table: P,VnTICLS SIZE ARIA OF DEPOSIT jHAZARD FOT.i .TL-'-.E If ! Above 5-0 microns riasG.1 j None 1.0 - 5-0 microns j 1.0 micron ; 0.25'- 1-0 micro;..; Lpp..r respiratory to ! Great to eutrem alveoli j Alveoli (most optimum I ...... rise for alveoli reteuiio..) 1 ! .'.I'.'-. St- ! i Entrcmj_____________________ rs The- actual procedure vac star-ad on 3 December l(>Vl, a- which - tvo type-3 of samnlcc verc obtained. F:rsv., a singi- atmosphere suir>lc- of "Kaylo': duct vas tab-.a ir. ; . area of band cars ,7-1 a:. ,`,'2, --hrough the tie-* of a Killian.-...wer apj.-r.,,v...: r-.-f-.rre.L v: oa .^Ot , and particle sizing u..c:.i,iques, re..-.. -r_d to cr. page vjre'then used to determine the particle clue a. tribation of c S. ...ICO. O 0 C O .1: X , a U11 l. C t --. a.up 1C 01 CC'TM- ..Ci. .... . w:.. --. - j. \. a *. collected nnd liter analysed for c ryetall-' r.e free ell leu fy two :....bhcas, i.e., 1-ray diffraction ~ud the I-tent \n.s cuc;.:..cal technique, Doth Lie cod on payo f . C.i a .January j_yo_', two sa.. p 1 1 . of "`iiiermobestoc" dust we-re also obtained and evaluated i'or bo: i ... percentage crycualine ires silica ana particle sice aastrisuti 'in a manner identical with that used on the "Kaylo" materiel. FROCZDi Ilf: loth sampling and analytical methods are as fellow's : Carolina: (l) All samples used in determining the- actual con :c rye rati in air wore collected vith a midget impingor apparatus vhich 1; a land-cranked, four cylinder suction pump drawing 0.1 cubic fee of air per minute through impinger flasks containing 15 milliliters of double distilled dust free water. , . (2) All samples used in obtaining particle sirs distri.leti cata were collected cn Millipore Filters connected to a small vesory operated pump. These Cellulose Ester filters are recognised a .. ,-iy.g most efficient and adaptable filter material available on the . ...r'.-tot , today being capable of retaining particles do:m to and below 0.1 micro: ? v ** p ~ n .'.fl^tical: (1) The act --1 counting technique, used in this . referred to as the Light Field Microscepic Counting Tcci accurately described cn ; ages 152-153 of Industrial Dus- 1 J. II. Frown, K. K. Cook, F G. Key, and Theodore labile Health, Vol. 40, No 4 (April, 1950). to ; r (?.) The sizing t. .L.u. sources. First, the sample was g :: ..' hv a from ..r. .. for U/.; in a poi.iit.e.u Lr.g i..ef.icxl veici-0 e.1. -. * e- issue 01' the A.I.II.A. O.iir.rtorly. Second, the actual .a a accomplished in accoraur.ee vita tho tv-commer/. >_ A tochnicp. pages 165-179 of Industrial Dust by Printer A Hatch whie use of a Filar micromotor, and a standard nLcxs^i'i - 'hi the U3X (high and dry) and ()'{Z (oil iimiers Lon) ..... : vlv.. .; (3) Free silica dcteri.riration ; w :re pro..'-:.-1 t..r.r: e. cur cf both cf the'1 two following teehninix-u. First, ci. .mic 1 pzoev entitled, "Determination of Quarts, A.: the Fr-.-.n; : of I" .. I - -t - da in..' Phosphoric Acid" by M. A. Talvifie, DLvision* of '.a...-r. '.. ii;.;;.'. U. S. Public Health Service, Cincinnati, Ohio, ana s. acr.., X-r..-.y diffraction techniques as described in the encycjopedia cf ..a.r.t .:i-r. for Industrial Ilyciencpp. 1+36-439*. end us performed by Mr. X. Cars'.-.;, Research and Development Department, Instrumental Methods Croup, Union Carbide Chemicals.- Company. RESULTS: The physical data' listed in the appendix were evaluated ana revealed the following facts: (i) The composition of the dust (Table #5, page 12) is (a) For "Thermobestcs" (b) For "Kaylo": Asbestos - 12.C to 13-Op Crystalline Free Silica - 2.5 Asbestos - 12.0 to 13-Op Crystalline Free Silica - $.6' o o.u,, (2) The number of particles of atmospheric dus revealed to be: Table ,,1, (a) _n greatest ccnccntre.wi.cn in and around the #1 ..ni {2 c...rd sa-..u. (b) In greatest concentration when "Thornobestos,\ is being iVtricated. (3) The particle size of the atmospheric dusts in question (Graphs 1 and 3, pages 13 and if) is demonstrated to bo: Predominantly 1.0 micron in size for both "Thermobestos" ana "F_:.y_o::, but slightly smaller in size for "Kaylo" char, for "T-ormobestos". (f) The' length of time during which the particles are inhale ; demonstrated in Table 2 page 9 ) reflects a weighted reduction in the overall dust exposures to both materials. (5) The individual susceptibility is, in this case, one cf those unmeasureable human factors which lends special emphasis to the need for the conscientious use of adequate protective measures demand essential in the prevention of these incurable diseases. 1 is co::cu;.?ic::c: The T.L.V. (Threshold L:h..: .uo:;) 2c. be'.. 20 nppcf (Million particle. pe cubic i'cot) (2) oitaSt 1- co health experienced when processing ..".besto::" (a) Tae axLsthig ventilation control devio.:;: do net ado cnee rely cc , ..no uu.j c problem oeing cr'.utci v..ion . j... . rmo --os ..o-- cac--..-- a _.roe.x:.:od. (1) id.. .. bgt.ted exposure at tin; th.. V.L.V. baud siigh.by in one .-a (5) -ho iiaxard to health, exp. is negligible.-- ' ,.d whoa fabricating only "iCayl (5) The environmental conditions in evidence, daring the sur/ey of the fabrication of "ICaylo" blocks, wo re not health. .. : I (7) "Thermoboctos" blocks should not be fabrientu. with any exist band caw unless a more effective ventilation ay.: torn is design installed in such a manner, as to render it capable of rc-ducir. inherent atmcspncric dust concentrations to within safe and a limits. ' EFf (l) i i Do EOT fabricate 10" x 56" x 4" "Thermob. the existing equipment unless: (a) Tile atmosphere dust problem can be : air through the use of ventilation. os" insulation bio weed to bo lew 20 r.v c . j 01T (b) The producer of this product begin- mufacwaring an ins' i iblock which will not release, upon fabrication with a ba dust concentrations in excess of 20 ir.ppcf of air. Submitted by R. E. Rccle Industrial Kyg'i jt RE? I o"3 a cO f>c :in^p r-. O -- Q Q cn in <N 2 2 tn t-( *--! yv u w p- _ o in^es CO f'] (4 ft5 a / 3 * :u in 02 cn mO (a<] ocn ocrai ~o m QM M L;o."=>* m -* iuo~s* ^(t, ca Q=; h h; 1 co qw G#*3 *-' t.vj a?;r:; * S<c cs*1oZ; oO :_Oo ^O. co 3U4 h-<("/) -Q-* 0C*)} H*--3 H*--3 3- lO|u O m 5-i M CO <* <0 00 CO >0 K Ci CO c co x coco X= co co MOi=s Oc--c; <*! >c; ^ ** ti? ih' H 3fc;rL-: Ct:- iLr-*: co to i--i hhm m i-< n r ? 2 22 2 2 co soO7.". o7i o;.; *s ; ,-i *.*: I--jl HJ_Kjl _Hj .H.i u.i* ...';. ft ftft ft ft i-j ft < <c* C CJ l*J co co co co co o a 0O000 i i a '^ INDUSTRIAL HYGIENE SURVEY EVALUATION OF ATMOSPHERIC DUST CONDITIONS AT THE CONSTRUCTION INSULATION SI '' , ' TABLE 1 Atmospheric Dust Concentration Data I* As Collected with the Midget Implnger Pump & ADD.-iratus Type of JjUj u .Material hcmobestos n 11 f No. Location 1 jjl Band Saw "Mitchell" while saving 2 7f2 Band Saw "Bennett" off bearing 3 //2 Band Saw "Raines" while sawing Rate * in cfm 0.1 SAMPLE Time in Min. Vol. Blank # Dilution Count ,7 v'Jw.-C. 1,. in Particles Factor Particles .pc f C.F. i 0: . . : 10.0 1.0 8.0 250 69.6 0.1 10.0 1.0 8.0 0.1 10.0 1.0 8.0 250 105. t r 625 ii.h 84.5 101.4 v.n X -s n ..... it )i . 1+ #1 South Grinder 0.1 8.5 0.85 "Dunlop" grinding fiber glass pipe covers 5 //4 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 50 75-2 --y ~ 1 50 mo 1; j 20 o*"> *T7 --*.' 1 i { 50 95.5 j 20.1 - ' Kaylo II 11 II l #1 Band Saw "Mitchell" 0.1 10.0 1.0 while sawing I, 5-2 2 7^2 Band Saw "Bennett" off bearing . 0.1 io. 'o 1.0 ' 5.2 3 #2 Band Saw "Raines" while sawing j 0.1 10.0 1.0 1 5 7r3 Band Saw "Samples" 0.1 10.0 1.0 1 cutting radius on head segments 5-2 5.2 6 11 7 L-_____________ G. A. South end of Shop G. A. North end of Shop i 1 0.1 0.1 10.0 1.0 10.0 1.0 fc ` 5.2 5.2 20 1 I j20 | 50 20 1 j i 20 ! 20 j ii 1 37.2 | 3. Co 52.8 ; I j79 8 ; 89.6 l i ,-rC' r1 7 * 07 23.^ , 1,5.0 ; -* "j 3.0.;- I 1 TABLE 2 i L SUMMARY OF 40-HQUR WEEKLY WEIGHED EXPOSURES AS EXHIBITED BY FIVE WORKERS EMPLOYED AT BLDG. 511-2015 t 1 Length of-Exnosure in Hours Per Week+ Concentrations in mnncf of Air i i Worker* ! To Both "Thermo To Only To Only "Thermobestos " bestos " & "Kaylo" "Thermobestos" "Kaylo" i 1 "Mitchell" l6.o 6.4 9.6 83.3 !(,-;i Bona Saw 1 Ripping - Blocks) "Kaylo" 3-1 lExpiouriu !-*- ~ 1 ih.i 1 "Raines" (vr2 Band Saw Ripping * Blocks) 16.0 (6.4 9.6 101.4 17-1 ID. 4 ! "Sammies" t 15.0 6.4 ' 9.6 A 13.1 7.7 V J "} . ;(.?3 Bind Saws sf'.; Cutting i. 1 1 1 - ^ /''Sf.us on ad -egments) t ! : ; i ; l 1 , ' ! 1 ' t I j i "Bennett" ,' ,,-2 Eand Saw Dff 3earing) ------ I -"Jordan" '::3 & #4 .band Saws .Same as j "Samples" 16.0 1 6.4 i 9-6 64.5 SAME AS SAMP] ES 4.5 i4.6 | 1 j i * These workers were selected for identification upon the suggestion of the Shop Insulacion Fabrication Foreman, Mr. D. R. Matheny, who stated that these particular men prove te be . the ones most exposed to high concentrations of this air borne material known to nhe trade as "calcium silicate". + These hourly exposure values were derived on the basis of the following estimates also submitted by Mr. D. R. Matheny: 16 hours a week are probably spent working with both products (i.e., "Kaylo" and "Thermobestos") with about 40$ of this being "Thermobasncu" exposure arid oO$ "Kaylo" exposure. : 1 i 1 1 The following general formula was used in deriving the values above as weighed exposures: CO / \ '/ \ 'Conccntratio: Concentration of Number Hours of'-.? of "Knvlo" i; Weighed Exposure --_ \V""TThhermobestos" in mnncf of Air/\ Daily Exnosure r n-? m- in mppcf of Air -------------------------------------- -------------U---o----H- o1--u--r-s----P--e--r---W---e--e--k---- L-- B-ily i I tab: ''TNEFLOFBOTQS1' PARTICLE SIZE DISTRIBUTION US INC- BCTB "\ TEE'L3X & 97X OIL IMMERSION OBJECTIVES IN COMBINATION WITH A 12X FILAR LI ELI-E A , 97X OIL "XAYLO"' PARTICLE SIZE DISTRIBUTION USING BOTH XRSION OBJECTIVES' IN COMBINATION WITH A 12X PILAR E/ERl'KOE l o;! U3X CR 516 MAG. .WKE3S 1 FILAR DIV.= Q.2 MICRONS | 57M OR ll64 MAG. WH23S 1 FILAR Dr/.-=;;:c:vV; Acror V F-RAC-T IONS ii faction v o M 4 o K P's. 1 > 0.0 L. 0.0 0.1 0.2 0.3 0.4 0.5 0.7 0.0 11 I !f11 0.9 TO? AL 0.0 0.1 0| 0 i w 0 o.4;|o.5 | jo.c : i! o.v o.t :o.r. : vc;:..} I 1I 1 1 _J 1 ! 0.1 ii i .) 1 1 1 1 111 1 i 5 . J- ; 0.2 11 : 1 i - 11 ! 2| 1 i 1:2; 0-31 f 0.4 8 pHT Ti.iT j?3 I i 0.7 | 0.0 1 24 1 0.9 1 1.0 1 20 2.0 1 0 1 3.0 1 3 4.0 | 2 1 5.0 1 3 1 6.0 i 1 I iI rl r~ 11 fi f III 1 1' ' ! 1 10 j 1 Sl - 13 2 1 ll 11 4 3 |I |I i I 1j ------- 1 1 1=1 c1 i| 11 11 1 i| 1 10 | 31 4$ 1! 1i 1 1i 1 0 i> 1 31 23 11 1(1 1 23 24 i! 18 II 19 1 04 .1 U 11 24 !! 1 1 13 1 if1 7 j| 1A 1 21 1 1 1 1 1 3i 1| 1 11 J- [ l1 1 ' j--' J 1 i 1 ! ! ; i 1i1 I ! 11 1 1 ( i; I i 111 ; 1 : 111 11i ! t |1 i G | 11 j 9 1 4 1 1- > 2 i 1 | M l 11 1 1 1 1 1 21 j |j ; ; ! 11 ( |il ! 1 1 1 1 j 11 11 1i . I --~! .. ' ' ' : ~0 . ; 2; ; -" j 7 i 1 ' ''J j : /3 2! j; = -; '1 7-0 1 _d.0 I oTo~j 10.0 11.0 12.0 1 13.0 14.0 I 21 l_ 1 1 i 1 11 1__ L--L ll ! 1 2 n3 1 11 I ; 1 ! i : J____ 1____I 11 jL_J I h1 J__ 1__ L 11 1 I i 111 I ill -t 15.0 ! 116.0 | 17.0 | 10.0 I j 1! 7I . 1 II (! 11 19-0 I___' I 20.0 I 1 T 21.0 22.0 I 1 I| 53.0 i i~~ i i j2'V.Q _!__ __ L !25.0 ,_,____ , 24. Oj___ . I f I2j^0 A 1r J__ L m J__ I__ L J__ L \I 1 o Metal 200 -CJ I TABLE 5 DETERMINATIONS OF THE PERCENTAGE CRYSTALLINE FREE SILICA PRESENT IN BOTH "THERMOESSTOS11 & ''KAYLO", AS QUARTZ, BY THE "TALVITIE" METHOD "TKERMOBESTOS" - "KAYLO" TRIALS 1 W1 in VI2 in GRAMS GRAMS w3.in GRAMS j, FREE Si02 1 1 0.5002 0.0390 O.OO69 6.42 i ]-------------TRIALS |V'l ln ` ! GRAMS W9 in GRAMS * i 0.5 0.0807 2 0.5000 O.O3L7 0.0068 5.58 l 2 0.5 0.0730 mI 1 CO 0-hjd W, in GilAMS _ 0.0364 SiOp 7.48 7.32 1 1 ; j 3 0.5002 O.O396 , 0.0082 6.28 I Average % Crysl:alline Free SiO 2 3 0.5 O.O563 0.0190 7.46 | 1 Averag e $ Crystallir.s I'ree Si02 = Li I Determinations of the Percentage Crystalline I 'Free Silica Present in Both "Thermcbestos" & "Kaylo" by the X-ray Diffraction Method* "Thermobestos" 2.5lo +155 : I ) "Kaylo" 5.6* t 1* *This indorsation obtained and reported by Mr. K. J. Garsha, Research and Development Department, Instrumental Methods Group, Union Carbide Chemicals Company. I 11 <' v' rA "? t f> n *. CoC-cv/ay Side View o'; a Bend Smv With Vonf jJ2fion Provided. I -J-