Document zn987d0x2ekdOp7drMnxvK87

//ft /*/- fcoft, /Inc/*/ /-"^cj (.Yd ft TC<f Klscoilancsun Kr.sarl Eo. 2501 Application Ho. 33C2060 Sopfcccbar 20, 1931. R2S0KI on LIQUID DIHL3CCRIG AirD C0CLIE5 USDOT^S General Sloe trio Co., *jonone0 tin2j , xi'. Y. T HONS 060221 TABLE C F CONTENTS Pago No. DESCRIPTION.................................................................................... 1 CLALiS MADE FOR THE PRODUCTS............................................. S -LAN OF INVES TI CATION........................................................... ee;e.:xi:ation and test record............................................. 4 4 RECORD Ii: SERVICE..................................................................... 21 TEE SUEEITTOR............................................................................... 21 COaCL'JSIOES....................................... 22 F.EC OIE-IEEDATI OK MONS 060222 tliaaollnnoovia Hazard Ho. 2301 Application Ko. 33C2060 Scptcabor 29, 1934. . REPOST on MC'JID DIELECTRIC AID'COOLIES iiEDIUlISGcnci*al Eicctrio Co., Sohcnootady, if. V. yso:i?nI ppceccts covee:p g? i:~' espor?; Ilottia diolootrio cooling' mcdluuc, "Pyrancl ivoq. 1476, _CiO, 1435, end 1430." C'.".:: vjj cr'.X'.cs:?. act vtse: T.io produatc rliloh arc to? ui'ujcot of this report tw ni^tRUfcc ox' chlorinated hydro carbolic in different proportioac. lacy cro palo yellow/ liquid a 'diffaric;; esarfeedly in re op cot to viccocity. Shay arc inton&cd for ar.o ao uiclootrio and ooolini' moiiionfi in cicatrical apparatuc. "Xyraaol So. la intended for uea In cabled and crpr citprc. Pyraiiol Hoc. I4C0, 1436, and 1430 arc in tended -or uco in trauaforc/era, Hoc. 14G0 and 1483 repre- CGntir~ two cirtrcnoa in the proportion:! of tho chlorinated hydrooarbona and Eo. 140S bclni' the avoraco. MGNS 060223 KH2 581 -2- VJ.HKIKG: "Pyranol JTo3. 1476, 1460, 1495, or 1488" stenoilod on oontainors. I n I 1! S MADS FOR THE PRODUCTS The manufacturer claims that the produots aro a distinot improvement in liquid dieleotrio and oooling media, aro nonflamaabls at ordinary temperatures, arid evolvo non- oxoloeiva gaseous mixtures when dooomoosod by the olootrio aro. . o Iho following claims are quoted verbatim: "Pyranol '.a the trade none of the General Eleotrio Comoar.y covering liquid dielectric and cooling madia which are non-inflammable end non-oxplosivo at ordinary temperatures and which even when deoooposci by heat or vie olootrio aro evolve only non-inflammable and non-explosive mixtures. The use of those improved liquid dioleotrios cffaotivoly removos the danger from fira and explosion horotoforo inevitably as sociated with the use of the inflammable and oxploaivo oila in eleotrio design. "The Pyranoio are ohcaioally atablo, non-aoidforning, non-sludging and of excellent dielectric properties. Being characterised by high nieleotrio strength and high 41elootrio constant, they are admirably suited for use in cica trical apparatus. The dieleotrio constant of the Pyrcnola, being essentially of the same valuo as that of the aolid insulation, insures a moro aqultablo stress distribution when liquid due to and solid insulation are arranged in series. The dio-1 stria constant, being moro than twice that of miner al oil, also insures a minimum of physical also por mioro- farsd in oapaoitor design. "The Pyranola have been in successful commoroicl servioo in inorouoing amounts during the past three years. The value of these liquids as non-inflammable and nonoxplosivo diolootrio and oooliv.g media has been demonstrated. "The first commercial uco of the Pyrnnols in er.pco- i'vr design was made in January, 1951, Commercial application of 1-yrar.ol oapnoitora has inoludod the use of pyranoi in all type3 of service, including a-o power faotor oorrootion, use on dircot current and high frequency circuits and othor spcoial coolieutions well-suited to demonstrate the reliability trad efficiency of tho Pyranel oanr.citor. In tho larger caps, si tor sixes a total of more than 8100 Pyraiiol-fillad units with a MQIHS 060224 UU2331 3 oapaoity In crocsc of 76,000 kva. have been airnufac turd and shipped ia addition to a total of more than 250,000 small leva. fyranol-flllcd onpacitoro for motor otarting and motor running.. "The manufacture of Pyrsnol-fillod transformers began in llurch, 1932 and has shown a steadily- increasing volume. To ante, more than 150 Pyranol-fHied transformers ln.ve beon shipped, totaling in oxoesa of 27,000 kva. "In the period during which ooiCBeroial application of the. ?yrnnoia has been nr.de, olsar avidenoo has boon ob tained of their non-inflanirnble and non-o::?losiva charaotar, together with the advantages aooruing tharefrom. As ex- anplec, the following service experionoea are oited, ona illustration Icing taken from oapaoitor, and the othor frem tranaforucr, enporlcnoo. "A 720 fcvh., *-3 volt ?yraaol oapaoitor was inothllod in a grain elevator. Duct aocumulation bo tween ter- a-iotalo of tho controlling air ciros.it broakor ovoutually oansod a severe arcover of considerable duration on the lino cido, revca oapaoi tor oases wore molted open by the heat of the v:.'. ..rial urc, In vwcuuy other oaooo tho capacitor fill ing plug '..as ml. tod off. In all casco tho Tyrsr.ol v.-as o::po-tO. to tho high t--L-.pGra.tnro and decomposition offcota of the cIcetrio arc under tho moat favorable oonditiona for oc'.'.flc.-.gration. In contra at to tho behavior normally orpootcu with mineral oil under Elmllar oonditiona, tho Pyranol did not burn nor evolve explosive gasos. ' "lixporionec Inc chov.u tho.t an are at tho curfaoo of the oil in an oil-filled transformer represents the moot serious condition favoring fire and explosion. Routine cn- c.u::r. - .tiou. of a corvicc operating Pyranol-flllcc'. rubv.uy trar.o- "oracr showed clear evidoaco of tuah an are bhv.'..:g been prea mt vr.k r-n(-. n-.'i-i t.-,i ti,: tx-aaoiorr;:r not exploded with ro- uT-ansfora;..- was osTll operating catio- i...o scriuy up so sue time of tho routino escxiinatloa. Tho aro had burned ooaplo tcly away tho insulation on tho iuocc.ing cable torninsl, tho burning ooourriug at tho surfaoo of tho ?yranol liquid, without cffooting tlio ccrvioo oporction of tho unit. "" "ihe rcnmlnblo ohcr.ical and clootrioal stability cf the Ig.-wtcri: as cviCesisca by their snococrful eoancroiai cpplithblea in electrical design, together with the uoa- infla----- bio uni n.c:r-irplo:.ive behavior of Pyranol-f.'.llcd or,lip:, .at under the neat favorable, conditions for five r.ni cnploricn, thoroughly cubctantintoo tho tc.n years' p aer.t and rucc_rch pi. g--n of which tiiooo products aro tho culnithtioa." MCNS 060225 :::;253i -i PI AH OF inUU GA HO H Tho objcot of this investigation woo to dotormlno tho firs and onplocion hssard of tha produo to. In planning tho investigation oonclfioratlon woo given to th9 Qoneral Eaturo of the. products, thoir Flro and Voxla haeard, Correoivo Action, stability, and Uniformity. Tho method of investigation of each of thooo phacao io given below. Information a: to the general nature of tho prod ucts was obtained by aoans of Identification Toatc. Tho flro hazard of. the produot3 v.ao invo3tlgatod in rerpoot v llnnKsbility, cnplocibllity, Ignition tem pera fare, ar.n dscompo sition temperature. Tho products of dcoompocltion were "investigated in raapoot to flammability and c'-.plosibil ity. Consideration was clco givon to tho tonicity of thy fuwoa produced on contaot with hot metal surface a and clootric erg;. The tests included Flashpoint To at a. Decomposition Temp eratu.ro luato, Ignition Icnper;.: ro Teats, Teste for i'laEraibility using specially dcsi.pncd appa ratus, triplesiro Kangs lasts, Analytical loots of Dsoempociticn Product- in tho prcr.or.eo of hot iron surfaces and olaotrio area, and Teste cf Transformers to Decimation. Corrosion Tecta of tho produots on mo tale ooDiaonly uaod in olectrioal apparatus woro oonO.uotod. Inform,:.tion bearing 0:1 the stability of tho prod ucts rise obtained frci. Decomposition Scaporatr.ro Toots, Corios:..on Teats, and consideration of tho ohcaloal proportios of tho products. Tiio process for ninnufaeturins the pro duo to is subject ' o Aciinioo ooctroi, and c. Gc tailed invoctigation of factory proocco was not thsrofors oonoidored noeossary. r z a z i v a ? i 1 E Lilli 2111 2 L S 2 DliSCr.II-TICU CF SAIiPlhJ she r.-nufae turf r furnished C-g il. cample 3 of the following produo.a: Koo. 1476, 1480, 1430, and 14C0. HONS 060220 iniasai 5- yrsFiTTxr t:;s?s; I... *._X)3 St seiflo Gravity - The speoifio gravity was deter mined 'ey means of a pyciacmoter. Vl_Dcqi_ty - The visoosity of Pyranol ifo. 1476 at 50 C(122 F") was d'etormlnad by moans of the Ssybolt-Furol Visoosimotcr using tho method (DS8-33) of-the Amorloan Society for Tooting Materials. The visoosity of Pyranol Eos. 1480, 1485, and 1488 ut 37.8 CO.OC 1") ws.3 determine! by moans of tho Sc.yooltUnivorcal Vlsoosimotor using tho method (D68-33) of the Aaorloan Society for Tasting Materials. Elrtillation Toet - A 100-g. sample was distilled using tho EcTtaoi 0720-30") of tho Aaorloan Sooioty for Test ing Materials. . - AOS- dlty nay determined-by mining a 20-g, oample '.vit'i oQ oo. of neutral ethyl aloohol and titrating with L/sl potassium hydroxide solution using phcnclphthnloin tt an indicator. Vno coialiy v:as oaleulatcd as por oont Lydrcchlorio acid by weight. Free Chloriden - A 50-co. sample was agltatsd with 10 oo. of water Iii a separatory funnel. Iho aqueous oxttraot was treated with aqueous silver nitrate solution and dilute nitrlo told, tho presenoe of chloride ions being indicated by the formation of a white prooipltatd of silvor ohlorido, El-termination of Chlorivo - Iho poroontage by weight of comouaieu oTfiorine was ueterminaA by tho method of Carlus. EL CULTS The rooulto of tho identlfioation toots arc rooorded in Table I. F7/.s:i Por i lysis: liLIi-DD The flat':, point was dotsrnlnod with tho Pcr.chyil-rtoiio Closed taster using the method. (D93-32) of tho American Sooioty for Tasting idaterinlo. MONS 060227 1 35 Specific Gi.-.vity at lo, 6 _o(f.n I'X 1 o. u ( L- _ i ) AKtufPizf/f TABLE I FtBTJT/r.l 05 n^rTI-TO.U^OT! TEtT3 1 Pvie.nol 1 Ko. 1476 | Fyronol l | Ko. 1420 . I'Vi-an'i Fo. Me 5 2 1.5433. 1.592 1.5-317 Apfi*r *'07,Tcs i*?f AA'M/Ci/tjstf W?S rOsg, ro Pyranc Ko. 1 1 1.5644 Vir-or.51 Soyoolt-Fi'T-ol at CO 0(122 F) Sr v'oo?. t-tfaivc rral c t 7.0 C(i00 r) 51.2 -. ~ 43.3 - 97.7 " 53.9 t'.cfc'.llatloa Tost: Initial Boll in;; Poind 352.2 C( 6.56 F) 203.6 0(404 F) 207.7 0(40o F) 206.1 0(403 F) Ti-rv^o.r.'tv.rc' Balov; 235 0(455 F) 235 C(455 F) to 270 0(510 F) 270 C( EJ.8 V) to 355.5 C( 650 F) Above 35.5 3(690 F) r/iounfc distilled gc^'MV'f.fc tr'iillcd auount distilled amount d loti lied - 43. 7;j by weight 18, 7;j by weight 31. Qfi by weight - 5.1fj " " 10.0(1 " " 9.7;1 n " 72.1^ by weight 24.0,j " " 0.14X " 46,6 f, " " " 0.5,1 * 65.9^ " ' " 0.4(1 " 54.8(1 " " " End Point H o n '" o Distillation loon 374.4 0(706 F) 3.5,1 by weight 0.4fj " " 29 i. 4 0(742 F) 3.0;a by 1.2;1 " " 395.0 0(744 F) 4.0(i by weight , 0.9y1 " " . 396.1 0(745 F) 3.573 by weight 0.6(1 " " Acidity as IlCl.Per Cent by Vtdignt 0,0017 0.0010 0.0018 0.0011 Free Cv.lovides absent absent Chiorltp (1) presort (i) vv~ no r.t (1) V'ui pj.'orntjf:! by ivight of combined ch~ ine eori the m.iaufaoturer aid he If. r.a oor.f id'ont - absent (i) ores:r apondo closely to data absaat in present fuvaishid by | HONS 06G228 KH25S1 -7 RESULTS folio v The results of the flash point teats are as l\o. 14S0 14E5 1-198 (2) Flash Point 232.2 0(450 F) 115.6 0(240 F) 113.3 0(245 F) 115.6 0(240 F) FIRS TESTS: METHODS The fire testa wore made with the Cleveland open cup, using the method (D92-33) of the Araerloan Sooioty for Testing Materials. . RESULTS Sample Kos. 1476, 1480, 1435, and 1488 gavo ' nogativc'2)3 4results in the fire testG.i-*) trjn.'.TgRB tests: METHOD The ..pparatus coneicts cssontially of a oombustion chamber surrounded by a colder bath, whloh is heated at a constant temperaturo during tha test by a bunaon burnor. The temperature of tho 3oldcr bath is measured by mesas of c. oalibrntod thcrmooouplo provided with a quartz tubo to protoot tho hot Junction. (2) i.u thin ooancotiou, coo Loto 4, (3) Intermittent flashes wore obtained but the preduot did i.ot continue to burn, iho cample ;:ac heated to boiling point; the test was then dioooutinuev (4) Xn view of the negative rosulto obtained i:i the Fire Teste, it iu clear the u tha finch point test cannot be depended upon to give a true noneuro of tho firo La-sard of these products. It was thtroforo nocscss.ry to oonduet teste of tho cnploaioility of the vapors cf tho produota in cpooieily-dosiGUOd appar atus. Sec pegs IQ, ot. aoq. HONS 060229 KH25B1 C The combustion ohuvber ocaolsto of a quarts finale of oonlo.il form v.-lth flat hot ton, -4-1/2 in. (11.4 ora.) in height, 2-2/C in. (6.0 or.. ) In diameter at bottom, and 1-1/8 in. (2.8 am.) in diameter at top. It la of about ISO go. oapBOi.ty (rated capacity 125 oc. ) having a ratio of surfaoo area to vclumo of about 1.1, Koaourod tost samplcn J.n the liquid phase arc in troduced Into tho boated oombuo tion ohumber by mci.nn of a ir.ioro pipette. Different amounts of tho oanplo aro adraittod to tho chamber In auoaecsiva teoto in ordor to dotormlno tho minimum temperature at which tho vapor of tho liquid in any proportion with air will ignlto. Ine residual vapora or gases in the corabuatlon chamber aro completely dicplaocd by a stream of air in the interval...between teoto. Ignition teiaporatu.ro tests woro aloo conducted using a hoi'-ooutal iron plato 10 in. square and 1/4 In. in ihlataiass, heated by a gas burner, I'Iaiao3 and hot gaoca from tho burner aro dofleoted from tho upper surfaoo of tho iron plata by a atrip of sheat iron extending 10 in. beyond each oido of tho pinto. Inc doflcotor is bolted to tho edges of the plato, asbestos gr.ehete boing provided at tho .Joint. A cui-bretcd chroma!-alumol thormoooupio (Ko. Id Av;g) connected with a pole nti one tor is used to moo. sura tho i.n- torn turn of tie plato, tho hot ,}v._.s tion of the tfccraocouplo loins 'erased to tilo center of the uppor surface of the plato. Chech mensurot.cnte of tho temp err Sure e of tab plate are also exile employing an optioal pyroaotsr of tho disappearing filament type. In. conduotims teste, measured . am pi os (up to 10 eo.) woro dropped on tho center of tho heated pinto. A slow stream of,air was applied to tho evaporating samplo in come Of the tests. the minimum Ignition ttomporaturo wao dotarrsinsd by cuaoesaivo trial testa, during which tho iron plato was maintained at progressively lower temparaiuroo. MQNS 060230 1122581 9 ' RESULTS , 'rile results of tho ignition temperature testa sro tabulated below: ' (5) Ignition Temperature Stable 'Jo. Quartz FlackIron Plate ( 6 ) l7 I 1-176 571 0(1009.8 F'l lag 3-4 see. 754 0(1389.7 F) 1480 553 C(1027,4 7) " " " 714 0(1317.2 F) 143 5 539 0(1002.2 1*') " " " 714 0(13X7.2 F) 1433 333 0(1027.4 F) " " " 716 0(1320.8 F) In the ignition testa using the hcatod iron plata '.'\o oombustlon was vary weak an4 did not show any teadciuoy to propagate beyond tiio vicinity of the boatod iron surfaco. It will be' noted tiiat there was no con finement of tho vapora in the tsata with the heatod iron plate.* 6 7 (o) The main value of tho ignition teat is to determine tho minimum temperature roquirad to produoe igni tion under tho moot favorable ooaditionc in tho ab sence of a flr.no or spark, inoluding ratio of vapor to air and ratio of heated surface to volumo of vaoor-cir einturo. Under lo.-.o favorable oonditione 03 when tho liquid is applied to a hot plato a higher temperature for ignition la requirod. A limitation of the ignition t.ot in a omall vooool is that it doc3 not show whether flame propagation for any material diatanoe will ocour. ? After deter mining tho ignition temperature therefore ^it_i3_ necessary to__obtain additional data having a bear ing... oallll/'mb. pro pa a . .ica./' liioiti dataware given by tests v.-ith hot plato and by flammability tests with speoially-dssigned apparatus. (6) The torn "lag" Is used to denote tho time iniorval between tho introduction of tho sample and the appearanoo of flame. (7) Within onperimental orror tho optioal pyrometer and the thoimocouplo gavo the same values for tho tem po raturo of the iron plato. nsNi 000231 r :.'H25ei 10 rznazxaziiTr tssts ik STFOibiiv-oisic-FTp apparatus: , M3 THO!) The apparatus oonsiats of a oylindrioal stool vessel 6 In. In diameter (internal) and 26 In. long. It is provided with a snail mioa window and an outlet to the atmosphere. The apparatus in hoatod externally by gao burners. Openings are provided half way between the ends of the vessel to admit eleotrode terninala oonneoted to c.n induction ooil. The electrode terminals aro spaced to give a spark gap of 1/4 in. An iron-oon3t'antan thermooouplc oonnootsd to a potentiometer is used for rough nsaouronents of the tem pera turo of the vapor inside of tho vessel. Samples ranging in volume from 20 to 90 oo. wero introduced into the cylinder which had previously boon heated to a predetermined temperature. The outlet of tho cylinder was closed with a loose asbestos plug. Sparks were passed botween the oleotroda terminals at intervals of l/2 rain. Rs3idu.nl gases and vapors were c'.ioplaood from tho cylinder by a stream of air in tho interval between teste. -- SS3UL13 ramplo No. 1475 - Ho propagation of flame 00ourred at tsapefotturoa u-` <:o 204 6(209.2 F). Flame propa gation with weed: pi-ocaur.. affoots (;)ust sufficient to push asbestos plug from outlet of cylinder) oocurred at 203'C (406.4 F). Moderate pressure effects (asbestos plug thrown about 3 to 4 ft. horizontally from outlet of cylinder) wero obtal__ d at toiaporaturea somewhat above 208 0(406.4 F). F-'mole Ko. 1480 - Ko propagation of flaao oc curred at tenplrnVurea un to 109 0(226.4 F). Flame propa gation with weak pressure effects occurred at 112 0(233,6 F). Moderate pressure effcota were obtained at temperatures somewhat above 112 C(233.6 F). S?up!cJf0. IdS3 - Ko propagation of flr.mo 00ourred e.t 'teh'palZtufea up' to 110 0(230.0 F). Flame propa gation with weak pressure effects ooourrod at 113 0(235 F). Moderate pressure offeots 'ware obtained at temperatures somewhat tbovo 113 0(235.4 F). HONS 06C232 1112581 11 5:,rF-C K.~. 1-iCS - Fo prop- fa tion of flc.no oc curred r.S Cc vscfreturca up to 110 C(230.0 F). Flares a. uio X v i.* \V * Hjb pi Cc w^li 0 (' 11 C G !^3 occurred at 113 C i'cbii. 4 F). Moderate p re a euro effoots wore obtained at tea pore lure s oemov/hat above 113 C(235.d F). ITII.C-tm T. ' "OS TESTS : ' METHOD The apparatus oonsists essentially of a glass chamber equipped. with a spar! gup and a stirrer. Tho chamber is cylindrical with tho lower ond hoiaispherioal and la appro::in:.tely 3 in. in diameter by 8 in. in height; it hen a net volumo of 1000 aa. tha apparatuo is provided with u glass lid supporting tho stirrer and tho loads to tho spar;: gup near the bottom of tho chanter. An opening in tlio lid is provided for introduction of the aanpio. iho glass oha-iber is immsreou in a molten solder bath to a depth of 6 in. In conducting tosta tho colder bath v:na maintained at a constant ter.torn t".ro of dOO 0(752 F), a r.-sur.u quan ts .y of the liquid to bo touted wae placed in the apparatus, and tho vapors stirred. Spnrlss wore then passed at tho Cymric gap while obs srvut.iouc wire made for flamo travel and pressure effects, following the test tho vaporc wore displaced by a slow stream of oompreaaod air in preparation for tho nent test. Toe. II. ld7G -ho result a of tho and 1120 in. ail* at EnbUH S O- enplorivo ran53 teats of Ssr.plco dOO C (752 F) are chown In labia r;cr--arrp;-OK TV'^Vi'/rCTT If'fS: tho apparatus dossribod in oennsotion with Igniiic:. ivmp-rm tr.ro tests .....s used in these tests. The vapors cvolv-1 on introdusinp samples into tlio hoatsd ohanber aero tested with moist bit-- litmus paper, a change in the color of tho paper from blue to red inaicatlng decomposition of the product, 'she minisr.'Sj temperature at which litmus paper clowed an c.pjiv.sir/jib chciigi in oolsr within a short time (3 min.) was oemsmored to bo the decomposition temperature. HONS 060233 :o ts T952Jm 1-0 l-'TG ldOO --Rr?yr,7S or SKr'!-0 PTTE R'.n^ 3ST.C -- - -- ----' -- r0lf- ' In V.. Cl. 0.03 0,. 0f2 X-rrer T/j, Vr.povi'/.c-u T.iquUi p-i' 1GC0 Cu. Ft. of Air (CalCT-lc-t-d)_ _ 3. G9 4.09 For Cent by Vclu"o 1.0 1.6 Y: Used in Tcrt CC. 0.100 0.105 Opvtr I'mit X>b Yi\ ]jO i* .'.z c ft Xiqui<3 per 1000 Cu,, Ft. of Air (Cr.loul c ted I 9.67 10.18 For Cent by Voli' 33 / (Cnler.lft.t3) 2.7 3.9 Vr:r.)z prr , effects vora obtained In thee 3 tost:, eg would be expected for nl::tures r.:- the Ilf'. ; of fla-'.TabiUfcy. i|i:i 11 ' i; l|;:| / ih 'll 1 1; 1 M 1 1 '1 CO ( . 1 ]; 1 i i. HONS 060234 "H2o81 - 13 - nrsnjiva Results of t'r.s d'.oeapo.cition icapcraiuro tccfco arc recorded in the following table. 3 .- y0. 147 6 1480 1435 1-183 Dcaonpooi lion Scanoratu.ro 300 C( 572.0 F) 32-1 0(615.2 F) Z-.'.e 0(644.0 F) 340 0(644.0 F) r. .fr/.f o.'.l isgts o? rercoiaosTgios ?otdpcss: LfnlOD ' not_Iron Surfaces - Tho oylladar orcviouGly dororlbcd v.ttiVr *uHIubViTi'ty Vecte in Cpcoisliy-do signed .'..pparatnu was also unci for exposing vapor-air cixtures to hot Iron surraocc. Connections for withdrawing cauglos of tho docor.poeiiiou produo to for analysis were inserted in th. outlet pipe. liio cylinder was externally hooted to a t-jperaturo of 6G0 0(1132 V) by gas burners. i_.1c~. of th. proli'-ot in tho liou.ld place were i:..irc cucoe. Into the lee led cyii.v.cr r.t c. unifoi-.t reto. &..uplca of the decos-poeitiou product?: wero withdrawn froa the outlet pip- and bydrochlorio acid, freo chlorine, 1 hoeccas, carbon dioxide, o:.yco;i, carbon -conoaido, cases absorbed by broalno, and esthzno and other paraffin hy drocarbon gases, vxro dotoraiued using the following exthods. Hydrochloric cold was dote rained by absorption with cater end cuhceeucnt titiv.tj.ou with standard aD;-.ll roluticn using methyl oi-ango us an indicator. .1 cevcnli.tor i. ntpie was drawn by a calibrated aspire ter bottio through t.a r.bcorption train consisting of throe spiral fbubbl'...g towers. Free chlorine interferes with tho il: tci.:iiaatli.n end ie removed by uoroury in contact with tho vator in the bubbling towers. icctc for free chlorine roro node Ir'liboratica of iodine fro.t acueouc potscaica iodide colutlon and ;ubccoucnt iitrailon with sodium thiosulphate .`.elution using ctorch solution os an indicator. .1 ccvcn-iitor crxple vac hrc.'.-h by a calibrated aspirator botils through a t...".i:i icnclitiug of two cpii'l for;;.', bubbling iowsrc containing po taeeiun led lie solution. MGNS 060235 Ln2jS1 Id- Phosgona i:a3 dotarmincd by absorption in aqueous aniline solution. Phosgene reacts quantitatively wi tii callino to fora dlphonylures, one molcculp of phoegoaa l ing equivalent to cno moleoula of diphenylurca. A 15-litcir samplo wee drawn through a train of throo bubbling toners containing fro yhly pro pared aqueous ar.il In a uelution saturated with dlphonyluroa. iroo chlorine interferes viith the determination and was ronoved by granulated antimony contained in a tubo through which too cample pascod before it on to rod tha bubbling towora. Tho prooipitate of dlphonyluroa waa ooparatod from tha anilino solution by filtration, washed v.-ith oold water, dincolvtu in ethyl alcohol, rscryctallizcd, dried, and weighed. Carbon dioxide, crygcn, earbon conorido, gases absorbed by tromino, and too thane, were do ter,,lined in tlio k'oorchcnd for;: of gas analysis apparatus after treating tho cr.uple with silver nitrate solution to remove hydro chloric, sold. Efoc' rii /.roe - The a py*. re fur consists of a cvllndriehl "to .i"vec'tVi "10 in. in d tamo tor (intcrrr.l) and 13 in. high. It ic provided with a wall mica window and an outlet to tho atmosphere. Gpcr.Lngn are provided in tha veostl to admit two electrode hollars, or.o holder being fixed and tho other movable. The cxootrcdcs aro copper rods l/2 in. in dimeter; their aroing terniralc uro horizontal. A oonnsotion for withdrawing samples of Aooompooition products for analyaio io inserted in tho wall of tho vessel. A mall cylindrical ccttllug olismber for tho re-oval of solid products of dcootspoaltloa io at tached to the campling oonnsotion. The eicotrodec are eoaneotod to a 220-volt, d-o. toot circuit, tho our rent being controlled by reweistsre. An enactor ic connected in the circuit and a voltmeter ic c.nneotod acrocu the electrode terminals. A :: ample of the pro dr, st, about 13 lb. , wc.c plan si in tho voescl, tho aroing tsralaaia of the electrodes being partially immersed in tho tasaplo. Iha aroing tominals wero located on tho anlo of tha cylinder, 3-1/2 in. above tha bottom. A continuous aro (170 airpcroc) was maintained botwoon tile electrodes until doctruotion of tho aroing ' terminals (5 min.). HONS 06G236 1.K2531 - 15 - S-.aploo of''':1" dooo:.'.po;itten products v.cro with drawn c.ntijiuously Siii'it' this period and tested for phosgene and oUlorine using the aetiiods proviouoly dcboribed. Samples of tho doccw.poci tion pro duo fee were also collected in evacuated glace templin'; tube-c at tho oonclur. ion of tho tost and tho chief constituents de termined, employing tho following cothodc. kydrochlorlo cold was dotorained by absorption in water and titration with standard alkali uolution. . Carbon dioxide, carbon monoxide, oxygon, US08 absorbo& by brcaiao, and paraffin hydro carbon gases wero tested for, using the 1'oorohoad apparatus after treating the cample with water to rcraovo hydroohlorio aoid. T,,ote v;ora also conducted with the arcing tarraimla of tho elGOtrodc3 3-3/4 in. below the levoi of tho sample in tho vessel. .1 21-lo. eonplo of tho product waa used in the so teats. lac aroing terminals wore located on tho a::io of the cyli nSer, 2 in. from the hotSea, A oontinucua aro (125 to 120 cape-roe) waa maintained between tho electrodes until destruction of the aroing toruisalo. Scaiplcs of the deoompocitioa produo to woro withdrawn at inter vals during the teat (oo fable V) and the chief oonstituoats determined uaieg the C-lhoia previously doaoi'iuod. iw.-- o u. r o Iki Ti'oa Surf/ o;r- - The results of asalytioal toots of tho dooo'-ipocislcfu prouuc'tu arc shown in Tublo III. Elcotrio. Arcr> - The results of analytical tests of the dccb'-oo'-rtica. products in the proooaoo of an olcotric aro between terminals partially iaoworood in Samplo Koc. 1476 and 14S0 are shown in Table IV. The results of analytioal tests of the deoenpot: it ion prod no ts in the presence of an cloctrio aro between termin'.la immersed in Sample hoc. 1476 and 1400 aro shown in Table V. -It'S 0? Th'MvSFOn'TElS TO T>TT''i:rr; TIO:': hhlnODS The following tost: -re conducted a 1: tho Pitta-' field, has e-chusc tta, plant of tho General Kxcotrio Company. MOMS 060233 T i T OS2 Hi! f. `-.t-s o^* att/t.yT'Xcax V2zv m c- priCTOS:;vyo-! promr n; piTESEiiif o?.j-:iron stj^ac-g EyO.x. uMorio Acid Ch?. .-ii?o X*la?C--~o Por Coot b7 Volu",0 " If ft ft * ft ft It sic Kc. 1476 5 to 13 r. aft" r'-n.rt of V'ofe 11.2 0. 000 0 000 , S6!:.pl9 l.'o, ld-CO 5 to 13 Kir., aft?" start of ? - - 7.5 0.000 ' 3.000 Car'ooa J'or,cr.i." - Or-l'S-TM G'.roc /iT'orbod by Brotirn 71s ` ' * j rvA. Othor Gcr-: juy ro.mxiTiyi HyO.roc^v'oo:!- it n n *t - ,, ft It n ft IT ft n ft ft Terfel3tn.vt of 0 Lin.al'tii' lb Kin. after Start of root Start of Test Start of Tes:' n 27.6 n 13.2 20.2 e.o 15.2 17.0 - 15.6 11.4 m 1.0 1.0 2.0 0.4 IT 0.0 0.0 0.0 0.0 - 0.0 0.0 0.0 0.0 In addition to ti*. abov ;> volafell 3 u COO obo: 1 tion pee u?ta cor.13 finely divided oarbor. via forraod i . ii i; mi ii HOMS 060238 r/'^T0"? tems o? r-;.-oo"." ;::H0;T rr.oDUC:-.! u; Tr:' prsssttcts of t3Ric,arcsp-v~ 7?r-- jpar^/.;t:;t irrrRsr:?) xn s;::g;y:s_oy pyr.UiO*_______ - - * * 1 ` '- p-flnl c r-y T ^7 5 i> i.-i.T. 3 f.:.' Start of Test Sr role Ho. 1430 a lira, at war Start of Test Ilyi' ? jcblorlo AoJ.i Per Coat by Volune Carbon Dlort'^.o " "" " Carbon toaotti&a OxyGc> " "" " " "" " P6.7 1.3 7.7 7.7 S4.0 0.7 A.3 10.0 Ones /.br,;.-bcl l*iEi-o.lo " "" " o o 0.0 theme ar.l Otkftr f ,r Paraffin Hyt',roa:',rboii(i " " rt " 0.0 0,0 ?- jJcar u o_ 1`c'jw vj 5 Jiin.rftT Start of e e t Start oi fist to 5 llin.after Start of Test Chlorln i " "* " r. n .. n 0.000 0.000 0.000 (8) trace in f.ao' Uoa to t'uo a bo vo volatile d- .. Mpo-ltlo i prc'.uota c. largo auoiv. S of finely divided orvi'bo'i v?.c fo'i1-.# - (G) JV :a tl.va 0.003. per ocrt by Vl-Iv.::j. MONS 060139 i! fi ;! o M ;i ; i jlj jih. i H-J J 1 !i 3 . * ii ' : i i i i; 1' M oi' a." jrr ' T, T"ST'> o:- r: 'oooci; n 173 r: or - - ..ire arcs m.zi Ts~--'.'."s rc:-7$ro " C? Kin. aftor Start of ? -A rocMtrlo ,'xio Per Cont by Volane 3b.5 o Carbon IMo-iO-o "- - CaTbon ro:.a~ !<V " " 0.8 Ox;-:'n - " 12.4 C'*o'-a At-cx* be' by Biaclnc - . . 0.0 l'-Vcrao r.r* Of - 5 ion ov.o V" . f f 1 ; Kyi roca rl'CJ.; -> 0.0 Sfi- -]l 1:0. l'~ 0 r L . fl-r l-tert Of I''"*. ftt/stert of T::*t 63.0 69.2 0.0 0.0 0,5 0.4 7.4 5.7 0.0 0.0 0.0 0.0 5 Ulu. after Str.rt of Teat 17.7 0.0 0.5 16.0 0.0 0.0 Chi, -Jr-,-,. Pha-i. - Star-, of Tost to 5-.- Min. after Start of Teat 0.000 (9) trace ' 3 .' In a-sui tl a.. ij ti-e r.\ j ! j volatile <to=c c'rton \ - z for-.-, j.1. :ltioa prc'iua t .i n l-trc* c.::u.it of fin*ly (9) Leai t : : 0.071 per cent by eolcna. . S33?lP 5?. l'-r.o 7.5 Kin. after Start 10 Kin. after Start 60. 5 0.0 0.2 7.6 62.4 0.0 0.2 7.3 0.0 0.0 0.0 S;art of Tect to 11 Min. after St :-t of T'=t 0.000 (9) traoa 0.0 1\ Kin. Her stp.rt _ cf T;z'i__ 73.1 0.0 0.2 5.1 0.0 HONS 060240 MH2581 - 19 Two transformers, rated 60 oyoles, 5 kv-a., 2200- 1;0 volts, were employed, the Interiors being designed for use in Lyrar-cl. laps were brought out from the outer layer of the 122-volt winding, arranged in suoh a manner that an oro could be started between the ooil and oarbon blocks loontod on the oore clamps, Tho carbon blooks were uoad so that the aro oould be maintained more roadlly durinar tho aroing tout. ' Steol subway tanks were used for these test tran3 formers in order to provide sufficient strength to with stand the treasure generated during the transformer failure Freasure-tight covers were provided with glass pressure re lief diaphragms designed to break at not less than 10 to 12 lb. pressure per square inch, A visual pressure indicator was provided in the oover to show the pressure in the tank bofore the relief diaphragm was broken. Pyranol No. 1468 was usod in these tests. hhort Circuit Test - The first transformer was prepared with sTs'c' arcing tips bent back olear of the oore and ws3 connected for test as shown in Fig. 1. Tho secon dary winding was short-sircuitcd externally and tho pri mary winding was connected, across a 12,000 kv-u. generator at 1500 volts. i ?'e fry T ? h with from ' to_0orc - The ' second trancVoriior'v.'as prcpiirco with the arcing-tips bunt so that they made light oonuaot with the oarbon arcing blocks and was connected for teat, as shown In Fig. 2, with, tho primary and sooondary windings in peries. The oova, tank, ana the other high voltage lead viero oo:'.. .toted to ground. Tho 12,000 kv-a. generator was oonnsated so aa to apply 7500 volts botween the ungrounded 122-volt load and ground. ' Tho transformers bofore tost aro shown in Figo. 5 and 4. RESULTS Short Circuit Tost - Ko appreciable charge in pressure ws-hth s.io can.: vise noted for approximately 2 miu. after current was supplied to tho transformer, Tho prtssuro increased fairly rapidly from thereon, and ap proximately ID see. later tho pro a euro relief diaphragm ruptured at a pressure of about 12 lb. per ct, in. Cur rent was applied to tho trsnef otv.or for approximately 1/2 min. after tho diaphragm ruptured. MCNS 060241 <TC QS/OA CA /?<! \se> r ^/A^O.Vr'O fti/A/A# y* e/f ^ 2200 isb^r- < W/SS&//VI5 < l I /SOO v * _'-iL_J r m/orAXr 200 y'Oir *vt*/0//V<3 MOMS 060142 _ i J MCNS 060243 HONS 060244 MKZ581 20 A largo volume or g-vese tas liboratod during the test. The8S gases did not 1 gaits upon application of a toot flame. Upon examination of the trar.oformero after tho teat, the ooiio wore found to be severely burned. Ar^ir.'jJfent _wi*h jtro _f roa Coil _to _Core - Eo ap pro oiab la o'.uSgo in pT6ouire~within too tahi was noted for noproximately 2 min. after current waa suppliod to the transformer. From then on tho pressure inoreaoed slowly to about 0 lb. per uq. In. and then lnoraasod rapidly to about 16 lb. per so. in. before tho pressure reliof dla- ohrugia ruptured. The arcing stopped shortly after the diaphragm rupturod. Curront ws3 supplied to the trans former for about i/2 rain, after tho diaphragm ruptured. A large volume of gaso3 was liberated during the test. These gases did not ignito upon applioatlon of a teat flams. Upon examination of tho transformar after tho teat, it v;au found that arcs had boon established between tho arcing tips and the ocre. Thcro waa no. cvldonoa of arcing along tho face of tho cc.'i. cor-jsior ttstt; ' ITdTHOD The mo tala used in tho corrosion toots v:cre oopccr, yellow brass, iron, tin-lead solder, oopper and tin-load solder, and copper and iron ooupled. lost speci mens, 3/i in. wide and $ in., icr.g wc.ro out from ohcota of t:. uo tels. The specimens wore buffed, measured, cloansed with soap and water, washed with ethyl nloohol and ethyl ether, dried, and \voifihod. Each spooimtn v;ao indorsed for half Its length in o. camplo of the product contained in a glass tuba provided with a corl: stopper. Tho tubes v;oro hoated to a tc.Tioorahuro of SO C in an cioctrioaily-heated ovon oontrollod by a ther mo etat. The sum pi o 3 Vfor oxamiift-d visually at wcehly in tervale curing tho toot for cviuor.roa of aorrocion. At the conclusion of the teat, the specimens woro oleansed, dried, weigh.<1 and tho charge in weight per square oenti- notur cf surface aroa cr-T.cula tod. HONS 060245 r.,:i56i 20 A large vclr:is < f 5:::: was liberated during tho test. These gases aid not ignite upon application of a tost flurae. Upon o::?.mir.o tier. of tho trnnnfornioro aftor tho tost, tho coils were found to bo severely burned. Arc in-; IV et with Arc fr-w_Coll^ to Coro - Ko ap preciable o.iuajys til prehcaro 'irtiiin the tun."; visa noted for approximately 2 rain, after currant was supplied to the transformer. From thoa on the pressure inoreasod slowly to about S lb. por oq. In. end then increased rapidly to about 16 lb. por 00.. in. before tho pressuro relief dia phragm ruptured. The arcing stopped shortly aftor tho diaphragm ruptured. Current 1123 supplied to the trm-.cformor for about l/2 min. after tho diaphragm ruptured. A largo volume of cases was liberated during tho test. "those ga-as did not ignite upon applloatlon of a test flame. ' Upon examinesion of tho transformer aftor tho tost, it wao feund that aros had been established between tho arcing tips an; tho ocro. shore was no oviuenoo of arcing along the face of the coil. COT.lf.qO'f 1131?: The matala us .id In tha corrosion tests wore oopper, ywllov; brans, iron, tin-land colder, copper and tin-lead solder, ana aoppor and iron coupled. Tost cpeolmenr., 3/d in. wide and 6 in., long were out from chocta of the ms tula. The Epee ' ' no were buffed, measured, cloancad with soap end water, washed with ethyl alcohol and otiiyl other, dried, and weighed. ' Fash epeoif.ca '-'as lams rood for half Its length in a aaiiplo of the pro duo. contained in a glues tubo provided with a eerie stopper. The tubas were heated to a temperaturo of 00 C in an clootrioaily-heated oven controlled by a thor- moctat. the cunplca wart cthou visually at weohly in tervals during tho teat for evidences of corrosion. At the reucl'.isioh the test, tho speoinens wore oloansed, dried, weighed and the change in weight por square ocnii- ricicr of surfuco area calculated. MONS 060246 1E2531 21 I&aCLl'S vrhcr. heated in Glass tabes oonteinir.5 Sample Ko. 1476, l-'OO, 1485, or 146S of iho products "1 90 C for 1608 hi , 3peoimons of ooopor, yallow brans, copper and tin-lead solder, and coppor oouplcd with Iron showed no vislhlo cvidouoo of cori-osloa 8::ospt for a alight dincoloi-ation of the eurfacioo cbovo the liquid, Syooiuona of iron, iron coupled with copper, and tin-load nolder chowed no change in aoDoaranoc. tho change in weight of the spool mona was very small (loas than 0.1 mg.par eq.am. ). R' H 0 0 55 l H S 3 1 V X c % these materials have boon in oorosierolal service in iaon.aoing amounts daring the past three ycr.ro. Eho value of the30 lio.ulds as dlclootrlo and ooolJ"'. madia has boon dcmoactratod. r h r s 5 r: i ? t 0 5 blip manufacturer, Vac Coneral Sleotrio Company, Schenectady, lew Yovjc, ia experienced in the manufacture of electriced apparatus and related preduats, many of their products being listed by Underwriters' laboratories. SU?yRVT?-r.'J Q'f ?RC.f/JCr:5 3Y U^SRiTUSnS' lASORATORIGS: Ihc oroduots will bo plasod under Reexamination Service. MCNS 060247 Ini c3 X 2. C 0 If C >. U...S .10 N s g'TT, .'.I, ll'-URF: ' Ihoac produoto are ulnlurta of ohlorinatod aro matic fcydrooarbono. Iho reculta of tho Identification 'iaoto indicato that 'do products aro re iituroa containing combined ohlorino ia ct'e-aits correcpcndins oloscly to those stated by tho Uuaii, uo turcr J virz m m-z:ss)i ihoeo products aro nenflaamblo at ordinary tca- poraturee. Ihcy arc capable of forming aciorately ooa- buatiblc and orplaaive airtures with air UNhor laboratory teat ceuditicua at higher temperatures, beyinain" at a tetipti- ttn-i level Of 112 0(213.6 i) to 113 0(233.4 F) , in tlio oai.o of Jyrunol XToo. 1430, 1435, ana 1433, and 203 C (406,4 F} in tho oaeo of Pyrfinol no. 1476, but undar prao- tlcai oonditioua foi-i.atlon of ooiebuatiblo or onploaiva Biat&rcc ia .-yarded ag ostveccly unlikely. tho fire he. sard ic very cs&ll. It rill be noted tint the fl-.rh pointa of the pro duct a era ccur.-! rntivcly high, and that a co-called "firo point" res net obtained. Y.'hilo inter-aittont flaehoa oc curred in thie toot, tho produo to did not continue to burn, ine- flesh point end co-cniicd "fire point" tosts, partic ularly the latter, in tho oaeo of chlorinated hydrocarbons era of United value an a meaauro of fire hazard but aro useful for purpose a of identification. She praotioal oic?difii;,i.cc of the above teats la tho oaeo of the produots m ouaatj.cn ia tnat tuair lire hazard ia oi a low orscr. MOM 060243 1 23 - Ac shown by uhc results of r'lrvisrbilJ.ty Tests in Specially-designed Apparatus vapor: of lyranoi No. 14V6 to ic:site or explode in tecta ct 204 C(399,2 F) but vrsiS ooctbuation ooourrod in testa at 20B 0(406.4 F). Vaporu of 3yr:.noi Eos. 1430, 1465, and 1408 fallod to ignite- or explode in test:: at 106 to 110 C(226,4 F to 230.0 !'; but weak oonbu: tion ooourrod in toots ot 112 to 11!} 0(253.6 F to 235.4- F). idodcrato cxplosionu v;oro ob- tr.ir.sd in testa at temperatures somewhat above thooo minimum voluoo. At a temperature of 400 3(752 F) the lower Uni to of flammability (upward propagation) of the vapora of Fyruaol Foe. 1476 ana. 1430 v;cre found to bo 1.0 per cent and 1.6 per cent by volume j.n tlr respectively and tho cor responding upper limits of flammability (upward prepagetion) were found to bo 2.7 per ocr.t and 5.9 per cent by volume. It will be noted that these are comparatively narrow ex plosive ranges. The c.irdmu.4 irn.'.tion temperatures of the products were fo-ru to b.s 571 0(1009.6 F), 555 3(1027.4 F), 559 3(1302.:. ., }, and 553 3(1027.4 F) for Pyranol Nos. 1476, 14-30, I/OS, and 1436 respectively as roooraed in tho results of Ignition lemperature Tacts. Ir. tho ignition tests u.iiss-s the heat:! iron no ignition co our rad at plate temp era tore a below 714 3. At higher temperatures the combustion was very weak end did not propagate beyond the vicinity of the heated iron curfaoe. ' In the tests vlth cleotrio aroa the gases liberi ated, oaroon monoxide ar.d hydrochloric acid, were in such proportions as to bo nonflammable alone or mixed with air. It will be noted that in the oz.ee of mineral oil ur.dor similar condition, highly explosive gases would be formed. In the Tests of 'francfarmors to Destruction under . both sr.ort-oirouit ana ;. roing coniitions, with Pyranol Ko. 1433 as the 'dielectric indium, tho gases liberated vroro practically nonflammable. Si* gases or fumes produced by burning or de composition of the products by hot rectal surfaces or eloa- trio arcs include hydrochloric acid, carbon monoxide, and in some ernes a small amount of phe-sgeaa. This will ordi narily cor..-.titute a toxic hazard only where tho conditions / aro such as to cause confineae-nt of tho fumes a: in a cl:--d room m which conbucticn or decomposition of the products is maintained by firs, highly hcatod surfaces, or cleotrio ares. HONS 060249 I IIH2561 - 24 - I It in to be noted in this connection that oils in common use at present as the dielcotrio medium for elec trical apparatus are readily combustlblo and v.-hon burning under conditions of restricted air suoply fora carbon mon oxide in dangerous oonccntrationc. V.'hila phosgene is poisonous, our data indicate that tho concentrations likely to result in the failure of a tranefomor or other electrical apparatus containing these produots arc not liable to endanger life. The resulting concentration of hydrochlorlo sold iu air when failure of a transformer or othor clootrical apparatus containing those produots oooura will depend largely up-.-, the conditions. It will oonstituto a toxlo hazard only whore the oonditiono are such as to oauee a high concentration of the fumeo ae in a oloaod room. The ejtceedingly unpleasant and Irritating fumes from the decomposition of these produots even in concen trations of a very low order aot not only to givo warning of their presence but to prevent dangerous exposure of persona. While carbon monoxide is odorless and toxlo its formation from theso products is always accompanied by tho simultaneous formation of hydrochloric sold gas which gives adeeuate warning of its presence as brought out abovo. It will be noted that combustion and decomposition of the produots was maintained by heated surfaces (600 C, 1112 F) or by an olcctrio aro in carrying out tho analytical tests of the decomposition produots. As shownjty the results of the Decomposition Temperature Teats, the oroduots wore not appreciably decomposed at temperatures bolow 300 0(572 F) cor..-;osi7r astiok; . The products do act corrode tho motala commonly uacd in electrical apparatus. ilo oon*c:;ion occurrod in tho tosts ooufiuotcd on representative uoiuis ana ailoyo as recorded, under Corrosion I*0 s t c. . It will oo noted from the results of Analytical sts of Decomposition Frodustu that appreoiablo amounto of hydrochloric acid are formed on combustion or decompo sition of the products in the preaonoo of hot motal surfaocs or electric arcs. HUNS 000250 has arodue be ero i'sa:c:iably c table and in uss art unlikely to underso decomposition ro suiting In an inorsaaa in fire hazard. I:', Deaoas::;- - .itie-n Torpcra 6n_-o Tents the prodtata A if. not vjU.-.rso r.pprec table ucceapocition at tcopcratir.roc belovf 200 0(572 B'). Coueidorationo of tho ckcraical g true turo and propei'tio a of the produota alao indicate that t.-oy cro reasonably stable. vsr.ror Concidor'lng tho E-nGral procoao of oanufaoturo, it app^--'c to be praoticablo to maintain a hih standard of uniformity on a ocsaorcisl ooalo. - (*\ MCNS 060251  5c S Z 0 M 5` 'T it !' C b to v'-.r.Gx-p.roAi ae> fie:: oosszr/.s cf uhjf^^iers' XAECRA 1-OkZZS: v.'o rscjnmond proaulgallon of tho following notioo to subscribers and tho notion indioatod thoreby: Guido Ho. 540 14 Septeabcr 29, 1254 - Laboratorioa1 Fllo 111X2 501 Gonerai Eleotrlo Co., Mfr. , 1 River Road, Schenectady, 2.' Y. Eioleotrio llodiumo Synthotio liouids intended for uso as diolootrio and oooHng mediums ir. cicotriosl apparatus, particularly tranaforaaro, cables, and capacitora. ilani'iaaraa'olo ar.d nor.a::oioalve at ordinary tecaporaturoa. llarlciag: "?yrcaol Hoa. 1475, 14G0, 1135, or 1463." Listed by Report - Further in'arc; at ion is contained in a re tort cc... P^-ptc_v.or --'I oo tj c x a * on tu y be ob tained cither from the mcaufactui'er or froa Underwriters' e.itoi'etio.'cct. Listed - Rccssssi nation Service. Sou description of Rocccanination Ssrvico on guide c.<.i. Tcrie by: ... n. ivac.':cj.j.3 lb. s. I'lldear C C. Clogscon Err-ort b-: -- t -- f--L raysioal Ctf-ilst Ervlcv.-cfl by; Aaso.Chca.Engr. klWN.uiTi^U ^ /'/ ,* 0v i i-- UoGI'* *.'"S aOTo^JOKu G0ud.il CIGU11 bXGH ii^C t C 0tl mOCC|> i)uU iv__;:.. j. ^ Obcrc MONS C6C252