Document LpqvrQDre0MMe0KjN4OxEOj9w

SECOND SPECIAL REPORT ON LEADED ZINC EXPOSURES 0 SUPPLS.1SHTARY TO: BULLETIN RC-64. . ................ Auguot, 1941 BULLETIN RC-68 . . . . . . . . . . .. \,'7 SPECIAL REPORT ON LEADED ZINC EXPOSURES V.ctfc- r' , .:.:V..ii v-umiiuE., .ii-J'pil. . March, 1942 -.1j;~. ~ ' : April, 1944 y. :L.* tCxTi: . Ball ..M.-..- ; 'r.-` L r:a'r1 ... v j . ;s '.Vj-:-'. - , ,. ' - E olsxKs' ia>rc;;3t'V' . .'TMrb3 . ,0.1 :> f '.Ev.'." V ''-i'Cu^L ... -Prepared by: J. Ti. Chapin ;T'.or vL'i .. January SL, 1945, - If,' '. / 'Han't V5*' J,: rss-?.i r- V . ' X ' $:?i;:L J .v'-ti. tt&'pz.'?-.: .; '-'.-V'-'-. ;iy. .If.-'' . - oC ;ai'>3L of .;;;lcr 1ft'isros v/s.' . jp~-iVvSp ifiAE.j; os'riihd. so; S&fctlsttft & ffiScsurw,. ludbiiir..;; :f?,ori!' Mix: .a 'aovcuft':>rv'! r- . ;-f:; J. ',.' AlilED RESEARCH LABORATORIES . i&i/ssu-p-'.vm'aSA}',-l'&&fy.sr-&^;i>6be&--V}''isi'c* ,'iriorvi.v . Ev^r . ., -Ch ic a g o , Il l in o is v' , . ^'Cval,!>:st3,.; th.is jvn-t.:'. lit- j-x- . no-..' vuilrAiy ..:i ^:.y -:n;V -V . - - ^ 0007-SWP-044706 -- farthest advanced, but all contrary indications from otier sources.are..:. taken into consideration. - . .. The Florida panels have now completed 41 months' exposure, Chicago, ,46 months and Coffeyville 45 months. Composition of Paints Tested . . Rex 471, 1-4-40 Basic Formula Loaded Zinc 44.8$ by weight' of pigment Zinc Oxide 29.1^ ... 3asic Lead Sulphate 15.7% Titanium Dioxide, 2050 T 14.3^ , Asbestine 2.8^ " Basic Lead. Carbonate .. \10,lyt : ", *1- -.Vehicle - Regular (5091) treated linseed type; `"T" r ............ 3 gallons bodied linseed. The only departure is in a special lead titanate formula (panels 4536-7}, using 53 pounds or . Sfe of lead titanate replacing part of 2030 T on a cost basis. 1 ' It. 'i-v: -i'Co, [Orphri' ; ' With some exceptions, the tint'series tests the same leaded 1.. b.:/.scerpb y'tKlilc zincs, zinc oxides [and.white.leads in. .the^following basic pigmentations: t-'r' . XXr&X'- . /, ?..;L^-,Titmr^';5i'i-Hpn7Chaik'[:^n^^Spe^al/v Material "L - ate type - / ' -'Tip, Type Panels 4628-9. .& Basic Carbonate.or .^phate J " ,.V " : ,' ' ' ` >T> ~ ' ^.uVrvra' ' 'V'-y Leaded Zinc, 35/65 / " ' ' . 45$ : ; > 46$ , 45, l. Asbestine 'l. ;; ; ' Rc-soU*- V ;-i iv. i V> `20$ r-~- . 30$ - 2299..$$ r " r.ivt'Ti4SetSiir>.*.5;i*`db.u-.rerf' '' ; :.''; Lead,Titanate':. .. ... 2$ ^ '' 5,0$, Kon-chalking ?i02, 205L - .14$ . '"10.$ l, ' ' 1 '>!! -. :rc.K i V li'v;. '-list lil-ll hid !S7^2f.! '{ohl.:,':'X-',c! . " ` ' Identification of Special Materials - ' -'r,> A. Leaded Zincs - ;.-;v. Ci:,'.v; . t. - Koste'dlil V-V.. ' ' i Lehigh 635 - 55/65 type, acicular ZnO in a mechanical mix, . -.Vi:Hew Jersey Zinc Company ... .. ... .. . -.} pec- Lehigh 60 Sf^65 type, co-funed, low oil absorption, - hi . > How Jersey Zinc Company 0007-SWP-044707 0007-SWP-000114077 Azo 55 L. - 55/65 type, probably co-fumod, American Zinc Sales Co. E.P. 70/56 - 7056 lead sulphate, 30^ zinc oxide,, Eagle-Picher Lead Co, 412 - Ozlo 5o/S5, co-fumed. E. liVhite Leads . Hat'l HIS - High tinting strength basic lead carbonate. National Lead Co. r S--77 KTS - High tinting strength basic lead carbonate, our special. S-TiV Q.P. - Quick Process, basic lead carbonate, our 10 dry. 9 dry - Basic lead sulphate, non-acicular, Eagle-Picher Lead Co. . NAELS - Acicular. basic lead sulphate, .National Lead Co, Zinc Oxides ' . , ZZZ-33 . - Azo acicular, American Zinc Sales Co. . ' . ZZZ-11 .. .- Ditto, slightly greater acicularity. .. . ZZZ-22 _ ... -Ditto, hipest acicularity.'.^ ,St. Joe ; - Non-acicular, St. .Joseph Lead Co. (Green Label #43). ...XX--SO ,t " .- .Horse Head.medium coarse;particlevsize, _ - . . ; . ... V-T"V: 5;'h.dn-^atd.cular/'New Jersey Zinc Conpaiiy. i-*.', .tj*' -r-. - 'rj XC-503 "/*i -? --. * ' *.*"*,^ *" \ - Horse Head large particle size, non-acicular, - ;r>-'.v ' C.. -New Jersey' ZLnc Conpany, . ' :-i` ' " 7. ~ 1 XX-92. Horse Head small;particle.;size, non-acicular, -..... , : ' "`New'Jersey Zinc Company. *'''? ' ' v T": " ".' St.' Joseph #46 is definitely the poorest'zinc'oxide, 'Azo ZZZ-33 slightly best in general durability. - But ZZZ-11 end-ZZZ-22 (only one' sample of each tested) now seem nearly equal to ZZZ-33. Horse Head XX-05 is deflnitely'inferiorj XX-50 is nearly as poor as St. Joseph #46. National acicular basic lead sulphate is definitely poorest of the white leads. It is still difficult to rate the other white leads. 0007-SWP-044708 *>>-' '-4r- but 13 dry probably deserves a slight edge. '' Mechanically mixed leaded zincs are still obviously infei-ior 'to the co-fumed. ' ,. , Tint Series Again the outstanding differences in the tints ('referring mainly to appearance characteristics) are between the 1895 and 2051 types, rather than between co-fumed and mechanically-mixed. . As to durability factors, co-fumed materials are quite definitely superior. Absence of many Florida panels greatly handicaps the drawing j)f.'.conclusions as to durability at present. With regard to checking end cracking, the 1395 type as a group does not.seem .greatly different from tile 2031 type,'. but ..there are considerable variations within each group. \ National aeicular ; sulphate is .the poorest white lead in both; National ... HIS;aid 18 .dryi.seem definitely better_as;used. witix 2031, vvdiile the others ^ihow.only slight.variations, apparently '_detetinined/;ly^the zinc oxides ^'; tihvolyed. ti;St. 5Joseph.#46/21110'Oride ng^^;Sems,poorest,: but..the ;advanfc-. ";geio. Azo ,ZZZ-_55 over`XX-505j^.;;Xl7^'J^a4'ttU.*..category i3 not as. clearly * marked as inv.th^_i^t^. ' /.;.h i '1 >'1 ,\ .The-^Ghicago penils,;Still;offer' n:great: contrast to -the jothera,, ; in fading';an.(i..diriiCOllectipn,,idBotii>i2031. and 1895. ty?pes nre-still hold- .. -.''ing 'n.-heiayy tmadc tof ^alk,.Ti4iich .means.^ery' bad _fading, -|!Die underlying : ' color .of* . the il8951 type, ;however, is preferable to .'that of ;th'e 2031type. Dirt.13 definitely worse on the 205l type. .At Coffeyville end Florida, less chalk is now held on the panels; here 1695 seems slightly better in tint-retention. .Dirt differences are slight, but there is no indication \' favoring 1095..-In other words, on the panels which, represent an advanced stage of self-cleaning, lead titanate seems to hold on to a slightly greater residual film of dirt than 205L. 0007-SWP-044709 0007-SWP-000114079 -5- A. Regular Typos, bhite. Hie general superiority of the co-fumed materials in resistance to checking arid cracking has been mentioned in the preceding section.. 41.2 seems to be the best leaded zinc, in general durability and, contrary to the situation at the time of the previous study, Lehigh 655 seems next best. Azo 55 L and Lehigh 60 are very similar and nearly equivalent to Lehigh 335,' National, acicular basic lead sulphate is clearly the poorest supplementary white lead in this group, but it is almost impossible to choose at present between .tire other..three (all carbonates). B. Special Type Formulas. White The 5* lead titanate specials again'rate very well at all loca-- ' tions; Ihe Eagle-Picher 70/30 specials are still in.good condition, but . there is a'definitely greater: tendency toward checking; than in the case :... .-. i :' - rnj : ; ' i! . of the orthodox leaded zincs. 10C-92 is still the poorest zinc oxide used in'/this special`type, with Azo ZZS-SS" probably best, f.i! ... / Regular Types. Tinted ':* <' ; Because of the lack of Florida, tests, failure is ofNlittle im- portance as'yet.'' Eiese co-fumed samples ran more nearly uniform in fad- 'IbJi' --.-vi ' .. f - . ing and <?irt than the median!cal mixtures, with very little difference due. to the various supplementary white leads. In fact, as to fading alone, there is no choice whatever between the lead titanate and 2031 types. At Coffeyville, where self-denning 5.3 mere advanced, there i3 little if any choice as to dirt, but at Chicago lead titanate again'seems to result in the retention of serious dirt for a longer time. The vIariation in individual cases (leaded zincs and whits leads) is now too slirhi to evaluate, either as to fading or dirt. 0007-SWP-044710 0007-SWP-000114080 D. Special Formulas. Tinted The Eagle-Piche'.' formulations correspond almost exactly to the re&ulav leaded sines in tinb-retention. As to dirt, they offer a dear-cut confirmation, of the trend toward worse dirt with, lead titanate/ seen in the regular forraulatiom. The 2031 type shows more evidence of incipient checking and cracking than the 1895 type. Die special l/o 1895, 2/3 2031 blend, both with 412-18 dry and Lehigh 335-13 dry, seems now exactly the seme as the most satisfactory samples of the 2031 type co-fumed formula in appearance characteristics, and is folly as good in durability.- Panel Ho. ' Examination at 41 Hon tits Florida Exposure. Whites *i; -JHHfr Test Materials Chalk Check Crack Dirt Gen'l Appear, Part X - Mechanical Mixtures 4500 F ZZZ-33 and Nat. HTS'' 4501 St. Joe and Nat. HTS 4502 XX-505 and Nat. HIS *4541 ' XX-50 and Hat. HTS,. 4503 4504 4505 *4542 ZZZ-35 and S-W Q.P. St. Joe ami " 11 ' XX-505 and M .. " XX-50 and " " 4505 ; ZZZ-33 and NABLS 4507 St. Joe and ; 4508 XX-503 " ...... *4543 ..XX-50..and g* . 4509 ` 4510 ' 4511 *4544 ZZZ-33 and 9 dry St. Joe and 9 dry XX-505, " " XX-50. " " r- 4512 4513 4514 *4545 ZZZ-35 and S-W HTS St. Joe 11 n " XX-505 " " XX-50 " " " 4516 **4517 ZZZ-11' and Hat. HTS ZZZ-22 11 " " VB, n n* ii . n n C A (C)m Sm .6 ' ; ' II C- ' Sm (c) : VB (B) VB S s (S) II F (F) F n -,-S*n ' <VVB f(c) VB . 'a11 ,S (s) .. 11 ' VP . :G .F - li WE - ,VB . VVB. VB WB VB V3 it it : n (C) B S (F)' "A ,.r , r:WB. So ........... B n n .. ,. " " F K:u . r;v,TO (C) v1 . p c A4 (C)m A (c) WB ,S ' VB ' s c s . (C) F P- (F) P (C)m A SE :i (0) VB s \ 11 B 11 VB It F (F\ (F) F nB it II Cm (S) (C)m s V F 0007-SWP-044711 0007-SWP-000114081 -7- pn -ht h^nation at <21 Sfonths F3.orida Exposure, Whites (Coni Panel No. Test Materials Chalk Check .......... .***. . C-jr.'l Crack Dirt Appear. 1519 F 4520 45214522 412 and 8-V< Q.P. , Lehi 355 and S-W Q.P. Lehi 60 11 " " Azo 35 L and .* 11 VB o it n (s); A n (S)m 4523 4524 4525 4526 ' 412 end S-ff UTS Lehi 635 and S-fl HTS Lehi 60 " " " Azo 55L " " " n i\ n ii A' (S)m (S)m Sn 4527 412 and Nat. HIS 4520 . , Lehi 635 and Nat. HTS 4529- Lehi 60 . and " 4550 v: Aso 35 L and H n -n tf (S) Sr a .A C> 4531 4532 412 and NALLS Lehi 635 and NA3LS 4533 Lehi^i 60 " " .4554 J---....... Aso -55 L r B.'-'lead Titanate Special Tvne 4555 412 and S-V Q.P. " 4536 . 'Lehi 835 and S-K Q.P. C.^Eario-Pi cher*Special Types 4537. 4538 XX-92 and E.P. zzz-11 4539 ' ZZZ-22" 4540 ZZZ-5S ti C ; It ' S m ti B .'. E [A > it A ' ;.ii ..: A r* ,' ' .(.V. n : It nA B) : 0, Tr s F C 11 (?) s ' 11 F (s) (s) G A (S)m (S) (C)m SD <C) (b) ;; (c) ' (S) (SJ- s s G 11 ir ' (G) sG "S ' - G (S) G- s '(G) (s)m- -s VB tl (B) : 11 (B) It F (G) G ,F A .;Si *4 ; M,'(S) t G' H (G) *o M) '( i 7,,\ ' if'1 . '< (C)m iC m 'Sm --S k-v FFa Examinations V' ' .Chicago - 46 Months* Panel. Gen. 'Ho1. Chalk Check Crack Dirt AE1- Part I -- Mech. Mixtures 4500 B A Ac 1 B A (C) (C). i- 2 1 B - - A A ' .. s *4541 / B (S)m S ir. (C) - (F) \F) F F 4503 :4 '5 *4542 B b B VB - A A A A S (S) Ss F' F S s F Tr (C) F . 'V " Cdffeyville - 45 Months Gen. Chalk Check Crack Dirt Aon. B WB B B B B B H - S m . (B) -s . S m VB s S m * (B) s A VB (S) F (F) F 'F A A A A `- S (S) VB s VB s VB (s) F (T) (Pi Xi' 0007-SWP-044712 0007-SWP-000114082 -S- iixaraina lions -- Coal Panel ' Fo. Chicago - 46 Months Gen. Chalk. Check ' Crack Dirt App. 4506 7 '' 3 *4543 `B VB B ' VB A .C A . ^ . A (S) C (C) (B)n s (S)m (C) F (F) (F) F 4509 10 LI '*4544 B B B B A S. s S A s (c) (F) A (S) s P A A (c) F 4512 . B 13. . B 1 ' 14 ' B . *454.5 VB ; A - (S) s F S E (C) a F A. .s c P S m (S)B - - c ' (F) 4516 " ; B .. . A ". s ' s (F) i*4a7-; . B A , A (s) ' F Part II -Co-fumed - A. Regular Type 4a9 ,B A .A S F . ; 20 *' 11 It C c (f ) '..21 ,B , - A- C ; C. F, C*VSvJ2-*.2. : " * A Cs) (F) ' . .7- %4S23-.'; fCt`24 n ,,it lit' (S) A , Tr .' Tr ^S (S) S S F F (F) 5 F * >yKV .4527 ^ 20 s~-23 Ur.s>: 1! : , . y .' : . n. S (S) Tr (S) A 'S AS F L' F F F ; r .4531 : ' . 32 ^s35 y.Z4 A.n' - `; ` 'A Tr VB H... A .t o .; ? ft .A (S) s S 'S F. F F > F- B. - Lfiad Titanate Special TVpe 4535 VB A AS * 56 B A A S FF Cy SaaLe-Pichor Special Typs 4537 B A C TC) F8 B A (S) S S9 B A Tr (0) 40 ' B A (") (0) F F F F Foffcyyille - 45 Months Gen. Chalk Check Crack Dirt Aee. B' A VB . A E (S)m VB A VB (S) Vi . (S) VB (s) VB <S> (F) F <F) F B , S m (3) (S) (F) B (S)m VB (S) F B S a B (s) (F) E S a VB (s) F B' (S)m B, A B ' Sm -B ~ SB B SB B .A (2) (S) VVB (S) F F B . s (F) VB . (% S4) F- (c) '(S) G c s ... G B .A (C) S G W A' S S- ' G A s (S) G . -n . (S)m (B) (S) . (F) > ,.r II R (S)m tr m. (S)m ;(S)m Tr.m A ft / A It ; A / \\ (C) v' A ; /A 't-*n: *., 7 (S) Ml (C) (S) C ;(s) ,(S) `(s) (3) (Si C (S) BS (ci). (S) .<n (S):; ;v b s ' B (s):; .(B) ;(s) (g ) (G) (G) G F G F" ;g (0)' (F> (G) (G), BA B A S m (s) S (s) (G) (Qi VB B, B B. A (S)m Sm (C) WB (B) (c) (C)m S s (S) (S) p G G G I > 0007-SWP-044713 0007-SWP-000114083 ' 1 ^Actual exposure time only 37 months. **Panel 4515 omitted. This panel is identical with 4519 in all respects. 3Ti-0n the whites, milder ha3 practically disappeared; erosion on the Chicago set has become noticeable in a few cases. General Motes: ?. ' 1. No flaking on any panels. 2. All Coffeyville panels show hail marks; no serious failure due to them so far. Panel 'No. ' Examination of Tint Series - Florida, 41 Months r Mil.Test Materials halk Check Crack dew Fade Gen. Dirt . 'APP , Part I -- Lead Titanate Type ' A. Mechanical Mix . ; i 4547 F 4548 4549 45*0 ZZZ-35, Nat. HIS St. Joe. " XX-50, XX-503, (B) It It . IVt'' (B)m (B) C (B) S m. B in Br "Cm; ii /J SB (S) B ' (S) * B (s) B ,(s) vs . ,.vs ' ` .(S) > F n M '4551 `4552 -4553 >^S54 .2ZZ-33/.X8. St. Joe/ 18 XX-50, 18 XX-505, 18 / .ZZZ-33, NABLS *4556 St.Joe, - 1... ?45S7^-XX-30/ ` XX-503, " (B)' (B)m G'a`; (s>: / B ' `....s. It f (B) (C)m (Bjo;;.' Tr, ,. > 4 v b ; *-,vs S" -.id- S'r..-Ir '..SV.jy* t%r r r / ' J~ , . B ' 'B' (B)m ` Tr.;; B >; ;V " ' v - ' ' * *. , (S) ` ; 4560 .4561 `4562 zzz-33, 9 St. Joe, 9 XX-50, .9 .. XX-503, 9 . / * v. * ,': V'.ry*/-,- iw i"* () ' v. / . c, (B)m Tr. . .-J ' ' ;';.b V `iVts) . " \m, ./ ; * a;' ' * '4563 4564 4565 '4566 ZZZ-33, S-W DTS St. Joe, " " XX-50, XX-505, " " c; (B) -B B BC B 'C `Cun (B) (C) Cm & ' Tr Tr Tr B '; II n it w1> .i n It rt tr H it V * H \ 1 i 'A '.i . i . 1* i i ;! S 1563 -4569 ZZZ-11, Nat. ETC ZZZ-22, " C n (0) S m Tr ' w (B) S m Tr it H \\ ii t> 0007-SWP-044714 0007-SWP-000114084 -9- Actual exposure time only 37 Booths. ^Pancl 4515 omitted. This panel is identical v?ith 4519 in all respects. ' w*On tlie whites, milder has practically disappeared; erosion on the Chicago set has become noticeable in a few cases. General Notes: 1, No ilaking on any panels. 2. All Co.ffeyville panels show hail marks; no serious failure due to them so far. Examination of lint Series - Florida. 41 Months Panel No. MilTest Materials Chalk Check Crack dew Fade Part I - Lead Titanate Tv p e A. Mechanical Mix 454? F ZZZ-33, Nat. HTS (B) 4548 St. Joe. " It 4549 XX-50, " It 4550 XX-503, " tr (B)m (E) C (B) S m. Bm B nr Cm S (s) (S) (S) B 3 B B 4551 4552 4553 4554 ZZZ-33, 18 St. J18 XX-SO, 13 XX-503, 18 (B) (B)m C m (S) B (B) (C)m (B)n Tr VB 4555 4556 4557 4558 ZZZ-33, 1TAELS 3t. Joe, !l XX-50, " . XX-503, " B B (B)m Tr B . 4559 4560 4 Sol 4562 ZiZZ--3o^ 9 St. Joe, 9 XX-50, 9 XX-505, 9 /wr';i C (B)o Tr B 4565 ZZZ-33, S-W HTS c (B) C m Tr B 4564 St. Joe, K B 3 (B) Tr It 45G5 XX-50, " " B c <c> Tr n 4566 XX-505, " " B c C m Tr it 1563 4569 2*Z-11, Nat* fiT-* 7.ZZ-ZZ. n ' C 3 (C) S m Tr (B) S m Tr n it Dirt (s) VS vs (S) s vs (S) (S) t! n It tl It It Gen. App. F n ti ti ti ti it n n !t 1 tr i; i. 0007-SWP-044715 0007-SWP-000114085 -10- Examination of Tint Series Florida. 41 Months - Cont. Panel Jb._ Test Materials Mil- Li trill Chalk Check Crack dew Fade Dirt Co-fumed 4537 f 412. 18 1570 152% 18 4571 Lehi 655, 18 4572 Lehi 60, 13 457.3 Azo 55 L, 18 (C) C (C)ra Tr n D (S) F (C) C (S)m Tr (53 <s) F 4574 4575 4576 4577 4578 4579 4530 4531 412, S-W HT5 Leiii 655, " Leiii SO, " Azo 55 L, " c c (C) (C) 412, Hat. HTS Lehi 635, Nat. HTS Lehi 30, Nat. 11 Azo 55 L, Hat. " c (C) c c c (S)m Tr il II II 11 II II It II It (G) (S)m II II ft II Tr m II C (S)m tl B (S) F II It tl II It II II II M tf It II tl II It ft vs ir It (S) it IMP 4535 4534 4535 453G 4587 4588 4589 412, NAHLS Lehi 355, HAELS Leiii 80, " Azo 35 L, (Cn) it c E.P. " n " 70/30, XX-92 11 ZZ2-11 n SSZ-- ZZZ-53 3 c c (C) (C) (S)n It 3 m rt (S)m it S n (C) (E)n C (C) Cm (C)lB (C)m S Tr (B) (S) (B) Tr B VS B VS B vs E SB Tr B (S) s (S)' (S) it it n ii s (?) (S) (?) s (?) (S) J Part II - 031 T Troe ..u Mechanical Mix 4590 As 4547 4531 As 4543 4592 As 4549 4593 As 4550 c Cm A (S) E <s) F c C (C)m iT VB (S) (?) 4594 4595 4596 4 TV As *x551 As 4552 As 4553 AS 4554 c (0) A (s) (B) (S) F c G (S)m Tr VB (S) (?) 4593 '--MC 690 4691 4302 4305 43 H: 139o As 4555 As 4553 As 4557 AS 4550 1'S 453: ;a 4560 f - ` r,. ;* As iV'v. n B S m VS B (s) (?) (3) (5) B m Tr VB (S) F rt C (S)o VS VB $) fr) (?) (B) 1 Itt /V SO' V3 (3) T 0007 -SMP- 044716 0007-SWP-000114086 JScainination of Tint Series Florida, 4l r'>o..v:'h,j Cent. J'an-1 To?t Materials lilP-L-C Fort II - 1 - Cont. '1:1 F As ,4565 As 4554 As 4535 46JG Au (E) (E) 4oAl As 4 5G:: As 4569 3_ Co-funod 4310 As 4567 (K) (B) (B) -11- Check (B) (B) (D (3) C Crack (C)B Cm S r.i Sa Tr m Mil CCW (S) Tr VS (S) VS Gen. Fade Dirt dEii. 3 S (F) VB VS (F) (B) (5) F (3) (3) F (3) (S) F ihanina tions - Chicago - 46 Months I'rjel Gen. i'lQ j. Chalk Check Grade Fade Dirt* App. Park [ - Lead Titanate Type Me chsnlcal Mix 4517 ( C) A AD V. 541 0 " "3 154L3 11 II ' VE 4550 H || " VB B 3 WB 45a !l It 11 VB VB 455? 11 I? " VB VB 4 553 tl II ' VB VB 4554 :: i. "B B P It 11 VP VP VP VP p 4555 4556 4557 4553 4; 53 'k > y1'> :oO'J 450 4c \-j ' 55.:. { i! ( 3) C C C 0 :i (i3) (>-' n j 3 C O rT ii .t: - 5i H 11 " VB VB 11 11 ir it it n ii n it i: it :: it ii it i K 1* '5 l ir ;; (3) p (Efl) 11 n i: 11 c .1 n it (L) IT CD II VB VP II It If a it ii n Coffeyville - 45 Months Gen. Chalk Check Crack Fade Dirt* Ago. C A S m f3) (C) (G) II VS c a (B) s r: tl Tr c a (3) s ii 11 Tr A (B) (s) ii 11 A A (B) (c) n ft Tr (C) m (B) s it C (C) c m (B) s c (S)a s si (b) s c A A (E) (C) c (S)r. S m (B) s II A S m 3 s If A A 2> s 1* A A (5) (C) If IT VC cl (Cn) a (3> (B) (a; IT A 3 a (1) c f /A S c iv A j ti ii ti ii ii p it it V ti T| 0007-SWP-044717 0007-SWP-000114087 -12- Sxaminationr, - Cor. B me1 :t o . r.r.iaftQ -- 45 Monthis Gen. JhaJ.\ Check C*-ack Fade Dirt-::- Ooffey'-ille - 45 Months Gen,. PChalk Cfc^cP. Crack Fade. Dirt? ApP ur t I - - Cor t. r- __ Ou-f al. -3<-L i.L;o? 4570 <X) C A 4571 4572 4 67 3 (B) (E) (B) 4574 iy.'S 4573 4 77 (I) ir i: it i: >1 4578 4579 Sl O 4581 (E) 11 11 ii. tl t! t: 4582 4305 4584 4585 ii ii It IT ii it H II 4583 4587 4588 4539 tt II tt 11 It H H II A VB 2 11 VVB it i: 11 1! u 11 (B) Tl Tl B F VP It 1! 11 n II It M ii 11 (B) P it n IB) 11 IT Ii Cb ) 1) tl n (B) II il tr II it ti ; tt it tt tt It It cII IT r? It U it II ir IT tr ti ii tt (B) ii it 11 nii It IT ii II ti tt tt u tr it it C A A (B) S (g ) It II II B (C) II s11 It tl tl tl sIt 1! If It If sII M It II ft tl M II II nII tII tl It Tl 11 ti 11 11 It 11 tl n 11 11 11 tl n It M It It II n tt tl It Tt 11 ll 11 tt It 11 (C) F sIt It tt it (a) tl It tt II It tl II It tt II (C) n 11 It tr 11 It ii it ft it tl tl it S m sit It tl it It 11 A tt (C) tt sII It tl tl Tt It ll It tl tl It -Part II 5051 I Type 4. Mechanical Mi:r_ 0 A4590 A 4591 IT If IT 4592 4595 11 tt It It It 4594 4595 4593 4597 tt tr ir (B) ir ir rr ti ii V3 B nIt It tt II tt 'n n VVB tl (B) n c II 4598 TT IT tt II II 4599 " II it II ^) 4500 H it ti tl 0 4501 II 11 D(i It VP H ll II p II n n t n TT VP C A A Lj II VS (C)m 11 II <s) <C)n IT II <S)m S m tl n A A Tt n S (C)tn It it S C m II it A (C)n> 11 A Ait If S C mti 11 C Cii It ti (C) (C) tt s (G) II It 11 II Tl It 11 11 II -II It It 11 II tl 11 11 11 II It II 11 0007-SWP-044718 0007-SWP-000114088 Examinations Conti Chicago - 43 Months ;5anal Gen. He. Chalk Check Crack Fade rirtfr J`gp. Coffayville - 45 Months , 'Go. Chalk Chock Crack Fade Dirt* Agde. I'art Ii - A - Cor.t. Mm (B) tt A II A fl ktoOt 4fi-0.a C l no tf n tf ft 4606 4C07 4C0B 4609 It t: If n If . Tf 11 n II ff If 11 VI!1 c i: (B) cif cij cir nc cit t cii P It. fl M (PJ P fl 11 C fl ft tl ft tl II tf A n (C) Tr m AB Sm . If (C)a (S)m II tl S, ft n it A Tr m If (C) (B)b II n ti C tE)m 11 ir (C)ms 11 ' ii (aj; ft II !f II It 11 ft (B)1611 ir ii If if t 4612 It n II I! n 11 11 (S)m (S)m If ii 11 VS m . (S}m 11 it II It Panel Test No. Mat. Chicago 46 Mon.ths Cofferville - 45 Months * Gen. * Gen. Chalk Check Crack Fade Dirt App.; Chalk Check Crack'Fade Dirt Ap p , 13. Co-fumed 4610 As'4567 (B) . 4613 As 4571 * tl 46L4 As 4572 tl 4615 As.4573 If . A tl n ti A WB C ft n fl n Tl ff tt it It p II It fl C. (S)m (S)m B It VS m VS m It II VS B VS m n II Tr b A ti s (G) n It n It ir If 4616 ..As .4574 It -U tr fl it (C).-1 II 4617 " As 4575 fl It ; ' ft' - ir C II 4618 As 4576 : ii ... n ii ' II ( C) i : fl 4619 As 4577 ti w . ti II (c):- ff iff Tr m ' A it tr n' . (S)a (S) m n ii II - .11 Tr S m it *. it } 11 tl A. VS m it it II 4620 As 4578 ii n 4621 As 4.579 n it 4322 A3 4680 ii tt 4323 ;As 4581 it . ti n - it it' .n tt If ti - ft _.s "c It - , n w tl Ltf II tl . n A (S)m N : II U . " (S)m = tf .n II " . VS m fl n fl . VS m tt ti II II (1 H 4624 As 4582' ti *, . n . ?i } u (C> II \ n ^ -A (S)t - H it r 4625 As 4583 n n C fl ti ' (S)m S m ft n r 4626 As 4584 n W n tl c. ti.; ti Tr m VS b .11 tt r 4627 As 4585 n n it ti c fl tt VS b (S)m It it r 4630 As 4586 ti n ' n (c) fl ti S (C)m It tt : 4631 As 4587 n 4652 As 4588 n n ti n it . it C C n . tf n VS n VS m It Tr b Tr m II it n it tt 4633 As 4589 C ti it n (C) tt A Tr b It it G 0007-SWP-044719 0007-SWP-000114089 Examination!: - Curt. Q^-ic-iCO - 45 'ion tila r'( frhyvi.Lle - 45 Months Panel Tost >- Gen. * Gen Ho. Mat. Chain Check Crack itie .Girl Am). Oh all: Ghe^F. Grade Fade Dirt Apc C. Specia.1 Fo:.au2 as 4G23 4XS-IC using 1/5 1895. 2/5 2051* T C A ,' A 77B C P 1 C ha Ira B S (C) 4629 Same, but pdhi C 635-13 A A WB C P CTrmABSG Mildew readings omitted. Eiei'e is practically no variation in ratings: S to (C) at Chicago, (S) to S at Coffeyville. Key to Designations: A - Absent S - Slight C - Considerable B - Bad P - Poor n - microscopic V - Very E - Excellent G - Good F - Fair ) - Less than Tr Trace " Supplementary Observations . There is a further confirmation/ on the'basis of the. series as a ihole, of the trend toward failure by cracking. Die cases of advanced failure, occurring now in several categories of Florida and even Coffey ville panels, all consist of an extremely bad pattern of long cracks, with some checks in varying stages of deepening into cracks. It is worth not ing, however, that not even the worst films have yet shown any signs of flaking; this may indicate that the qualities of the binder and inert art: 3uch that good cohesion and adhesion are obtained in spite of varied internal film stresses. It will be noted that chalking' is still heavy on all the whites, regardless of location, but that it varies greatly with location on the tints. Most of the Coffeyville and Florida tints have dropped to a nunb- 0007-SWP-044720 0007-SWP-000114090 -15- mum of "considerable" chalking, while many of tile Chicago tints, especially on the co-fumed formulas, are still producing and holding noticeably more chalk. Hie Chicago whites show a limited .amount of erosion or flaking off of the top coat. There seems to be little correlation between this slight erosive tendency and the formula variations, except that, rather surprisingly, the mechanical-mix type seems to show somewhat less of it than the co-fumed. In general, the changes which may be expected in fading in the future will probably be slight. In fact, the preceding three major reports, Bulletins RC-64 and RC-60 and the report of April, 1944, encompass all the important comparisons as to tint-retention, except that some interest remains in checking the slower-fading Chicago exposures. Dirt continues 'to be serious on these Chicago tints, and the combination of dirt and "chalk-mask" is obviously a much more serious shortcoming, ,for all practical purposes, than the comparatively rapid fading at the other locations. It is probably safe to say that few Florida or Coffeyvilla tints have presented as bad'a general appearance at any stage as that of the majority of the dirty, chalky-faced Chicago tint panels during the past year or so. JWC:AR J. W. Chapin 0007-SWE-044721 0007-SWP-000114091