Document 2JwzyvBb86kyqRNdMQvmyVOKb

f*'"' ~L_ ALLIED RESEARCH LABORATORIES Report of Investigations For the Month of March, 1946 M. VAR LOO #162 - Studies in Flat Kail Taint Formulation .. Considerable tine and effort was spent on the formulation and development of a universal master painters' paste paint, to be reduced with varnish and/or thinner to produce flat, semi-gloss or gloss wall paints, wall primer and sealer, and enamel undercoater. Ibis work lias reached the point where a very satisfactory paste and reducing varnish have been developed, and only minor refinements remain to be handled. Two paste paints have been developed, one on a Dehydrol var nish base and the other linseed." The Dehydrol varnish is preferred since control of after-yellowing is important in interior work. The preferred mixing varnish developed by the Varnish Research Division is CVR 452, a high solids low viscosity Fentalyn A- - Dehydrol varnish. CVR 453 is a parallel linseed reducing varnish.- The opaque pigments in the 'paste include Titsnox RC HT and rutile TiOj.. Because of the current pigment and oil'supply situation, the paste-reducing varnish combination cannot be promoted for.sales. However,- samples will be sent to Cleveland for evaluation and approval so that there would be no delay in getting into production should the supply situation ease. ;.r., . :: - Raw material cost comparisons of suggested mixtures (expres sed as parts by volume paste-reducing varnish-thinner) j: viscosity, and opacity comparisons with parallel standard rexes may. be summed 15) as follows! yv -. V 'I.:?- ; \y - ; Interior. Gloss Rail Paint. Paste paint reduction 8-7-2. Raw material cost based on Dehydrol 5104.83 per 100 gallons. Opacity 14,614 units, . Viscosity 41.5 seconds on #3 orifice. , c * ' ^Raw material cost based on linseed 101.41. ; "*- Regular Interior Gloss. -Formula of 8-20-45..: Raw \ material cost 5100.47. ' Opacity -14,206 units; ; r .-v Semi-gloss Rail Paint. Paste paint reduction 8-5|-2-|. Raw material cost based on Dehydrol $96.41. Opacity 17,747 units. Viscosity 33 seconds on #3 orifice. Raw material coat based on linseed 094'.75. Regular Semi-Lustre White. Formula of 9-25-45. Raw material cost 95.82. Opacity 21,280 units. 0007-SWP-045176 -2- M. VAN LOO Cont.__ jpffi - Cont. Flat Wall Paint. Paste paint reduction 8-0-3, preferably 1-1/2 parts mineral spirits, 1-1/2 parts kerosene. Raw mat erial cost based on Dehydrol $83.15. Opacity 22,590 units. Viscosity 11 seconds on #5 orifice, Raw material cost based on linseed $84.22. Proposed Paintercraft Flat #10. Raw material cost $85.00. Opacity 24,210 units. Wall Primer and Sealer. Paste paint reduction 8-1&-3. Raw material cost based on Dehydrol $88.37. Opacity 19,878 units. Viscosity 26-1/2 seconds on #3 orifice. Raw material cost based on linseed -$88.11. Regular Wall Primer and Sealer. Formula of 8-6-45. Raw material cost $73.23. Opacity 11,840 units. a-.- jjrf./ / V . Enamel Underconter. Paste paint reduction 8-1-5. Raw material cost based on Dehydrol $86.82. Opacity 20,704 units. Viscosity 30 seconds on #3 orifice. Raw material cost based on linseed $86,97. Regular Enamel Undercoater. Formula of 9-26-45. Ran material cost $81.92. Opacity 21,275 units. . ; ' During the month a new formula ms developed for the Paintercraft One Coat Flat #10 based on a raw material cost of 85/ per gallon, i;7he opaque pigmentation of the new flat is rutile titanium calcium and . rutile titanium dioxide and the principal constituents in the vehicle - are (3880)E and CW (1996) Linogel. v u Due to recent changes in the type of volatile used in (3880)E, ; we have found it necessary to revise the above formula to reduce the initial viscosity. Based on recent tests it appears that the introduc tion of 20 F for 2188 dry will reduce the body to the proper consistency. Work has been under way to improve the brushing properties of the present Flat-Tone White. The poor brushing properties of production oa manufactured on the recent lithopone alternate formula may be due to the lack of C02 in the manufacture of GV 7014 and to the use of 461 S ns a substitute for 461 L. 461 S produced rather high bodies in the *ged paint. If the recommended cooking procedure for the manufacture of CV 7014 or (3030) E is not followed the brushing and washing properties of the flat wall paints seem to be affected adversely. 0007-SWP-045177 0007-SWP-000114548 jtig - Exterior Primers Panels 11005-11018 C were prepared for exposure at Chicago testing various primers to he used on fabricated Dural aluminum beveled siding. This supplements exposures being made by Cleveland. The primers used in this series include: Rex 70110 - ANTTP656-A-1 Zinc Chromate Primer H 7645 - 52-P-18 Bureau of Ships Zinc Chromate Primer Rex 16174 - Kromik Primer Rex 27507 - Red Lead Primer Rex 49 - Red Metal Primer Rex 450 - SWP Ondercoater Half of the aluminum panels were solvent spray cleaned and treated with phosphoric acid, the other half only solvent spray cleaned. The special primers were followed by a coat of SWP 450 Undercoeter and a coat of Gloss White, making three coats in all. One panel has only a two coat system of Rex 450 and Rex 471, #183 - Pretreatmeat of Metal Surfaces for Painting See Project No. 12. #148 - Examination of White Lead Preparations were made for a meeting of the L.I.A. Shite Lead Research Committee in New York on November 18. No work was done on the following projects: #160 - Painting of Bricks #178 - Studies of Dark Colored House Paints #112 - Fire Retardant Paints 0007-SWP-045178 Control - no DDT. 0 u Z'n DDT in the primer. 0.2^ 'DDT in ths top cont. 0.2$ DDT in both priner and top coat System #4 showed the best results, giving complete prevention of barnacle grovrth for four weeks and slight retarding of barnacle growth after 16 weeks, All other systems allowed, some barnacle growth at the time of the first reading, 2 weeks. System #2 offered slight prevention of growth up to 8 weeks and System .6 up to 14 weeks. #177 - Pigment Studies Bulletin RC-81, "A Useful Hiding Power Comparison of Various White Pigments," was completed and distributed. A shipment of ceramic grads Ti02 was received from the Glidden Company. It was found that when the normal Ti02 content of He;: 450 Undercoater was replaced with this ceramic grade material all character istics of the Rex 450 Undercoater were normal except that it was def initely lower in opacity. An effort was made to compensate for this by using 135 pounds of the Ceramic TiOs instead of the 120 pounds in the regular formula, but this was of little help, Therefore, it was concluded that this material should be used in Rex 450 at the normal titanium poundage. By working with the Auxiliaries Department we have arrived at a tentative minimum specification for 414 dry - 105 Leaded Zinc Oxide. Materials meeting this specification should be reasonably sat isfactory for usage in house paint undercoaters and bases for tints, not whites. Following is an excerpt from Mr. C. H. Adams' report of December 2, 1946: flinimum Maximum )0 CilU . 87 93 % PbS04 6.3 % ZnS04 0.5 Res, 325 mesh 0.2 Color 4(T Texture2 Equal to lot 2226, Sample AURL-399. The minimum acceptable color for 414 for use in undercoater and base for tints is 40 on ths color scale. This minimum color should be understood to be acceptable only as an emergency measure and every effort should be made to raise the color wp bo at least the color of average production of 48 as repre sented by lot 2226, sample AURL-398. 0007-SWP-045179 0007-SWP-000114550 I - 1,5=*, A177 - Cont, "Th3 tone of the color of 414 if different from 412 should pre ferably be tonerd the yellow rather than the red. Present production is yellow toward the color standards but is def initely purplish red toward 412 standard. This reddish tone carries over into the paint and is undesirable. zThs texture must be equal to lot 2226, sample AURL-393, as determined by the spatula method. Procedures All tests are to be run according to the tentative out lined procedures doted 12-2-46 by Mr. Verduin. Quality Cards Quality cards, representing shipments, should shovr the follov/ing, as well as the usual, identifying data. . Color -- Actual rating on color scale Zn Pb _______________________________ SnO PbS04 ZnS04 Texture -- Standard or standaid plus, 325 Residue C. H. Adams1' ld2 - Study of Improved Mixing and Grinding Practices Considerable time has been spent during the past month in attempting to standardize on a milling technique that will provide reproducible results consistently. The best method evolved to date consists in operating with feed roll hoppers at fixed positions vjell in from the edge of the rolls. All batches in a given series are then milled at the sane setting. The full face of the grinding roll is not used ana the amount used varies with batch consistencies and textures. The time for milling any given batch is therefore corrected inversely as the ratio length of roll/used roll face. Used roll face is equal to the width of the paint film on the grinding roll. Produc tion rates are then calculated from the corrected milling time and. compared. 0007-SWP-045180 0007-SWP-000114551 #12 - Cont. Another sub-group tests OV-578 Plywood Sealer Concentrate from Oakland against CTV-4275 clear sealer and no sealer, r:ith Rex 450 Undercoater as primer and Rex 471 doss White as top coat. On all the above, tile same Rax 471, date C 1075 is used as top coat, the panels r being mounted and caulked after priming as in 1945. Another sub-group consists of four shades of Prenite paints from the Pre-fabrication Engin eering Company, specially applied as textured finishes over OV-579 Ken food Sealer as against no sealer and CH 3285 as against. Rex 450. (See >i - Project j/97i) Except for the small sub-group (a) .above, all tests are i on regular exterior Douglas Fir plywood; both regular and Super-Harbor- ite aro used in (a). Exposures 7096 - 7100 F, a series of tests of Rex 450 Under coater on one 9-foot cedar panel, were examined after 36 months at Flor ida, vertical south. The tests compare Rex 450 at 1, ?., 7, 15 and 30 days drying before recoating with Rex 471 Gloss White. Nc failure is shown at 3 years except moderate erosion, with very slightly less on the 1-v and 2-day drying tine samples; General appearance is good. Past Florida reports show no differences except a slightly earlier -if. T.. appearance of dirt on these same samples than on the longer dry. This test indicates that SViP 450 Undercoater is less critical as to recoating time than was true of SY.P Gloss Unite when self-priming was recommended. SWP self-primed, when recoated after more than 48 hours' drying, showed reduced durability; i #14.3 - Examination of White Lead A meeting of the L;I.A. White Lead Research Committee was held in Hew York on November 18 to review progress to date and to arrange for future work. No work was done during the month on the following projects: >r: f/165 - One Coat House Paint ;L83 - Pretreatment of Metal Surfaces for Pal; ' #160 - Painting of Bricks #112 - Fire Retm.rdant Paints 0007-SWP-O45181 0007-SWP-000114552 #77 - Cont -23- Number FN of Paint Rex Disc Number ' Number Type and Quantity of Funeicide Used Degree Number of Mildew Months Control Test Exposed 51 642 Rex 210 2? Dowicide 6 5 0.02? Hg. as 0 Hg. Naphth, 1 6-1/2 52 643 II tt 2? Dowicide 6 3 0.04? Hg. as 0 Hg, Napith. 0 II 53 644 tt 2? Dowicide 6 1 '0 0.10? Hg. as 0 Hg. Haphth. If 54 645 n n Dowicide 6 - 3? on paint 20 II #12 - Exterior Primers Panels 11213 - 11226 F were prepared, supplementary to the spe cial plywood tests described for Chicago exposure under Project #12 last month. These cover the same CB-32B5 Exterior Prefab Primer specials as listed under (a) and (b) of #12 in November (5% ZnO vs. 11.6? V3. no ZnO and special styrene varnishes from Resin Research). These tests ore on regular Douglas fir beveled siding, for Florida south vertical exposure only, Rex 471, C 1075 being used as the top coat in all cases, #162 - Studies in Flat Wall Paint Formulation Flat Wall Paint Shell has supplied new samples of deodorized thinners for tests in wall paints. These are Special Mineral Spirits Code 8296 and Dispersol Odorless Base Code 8233. Characteristics are as follows: Name Special Mineral Soirits DisDersol Code No. 8296 8233 A.P.I, Gravity 51 46.8 Specific Gravity 0.7753 '.7936 Pounds per gallon 6.45 6.61 Color, Saybolt 30 30 Corrosion Cu. strip Slight tarnish Slight tan Kauri Butanol Value Aniline Number F. 31 154 Approx. 28 - Flash Tag CC F. Doctor Test 112 Negative 155 - A.S.T.M. Distillation 0 F. (See next page.) 0007-SWP-045182 0007-SWP-000114553 -24- #162 - Cont. A.S.T.M. Distillation F. ______ Special Mineral Spirits Dispersol B. P. F . 10? 50? 90? End Point 314 387 326 409 340 432 565 464 388 485 The. new samples were supposed to be further improvements over similar Shell thinners submitted earlier under the same code numbers. Actually, no improvement over the earlier samples was observed when used in Flat-Tone, but again the deodorized thinners were far superior to the regular stock thinners. We have recommended that Cleveland conduct full scale room tests. Enamels Comparative tests made on the alkyd formula of Hex 710 Enameloid White using 3 pounds respectively of aluminum and calcium stearate against the control with no soap, showed no tendencies toward seeding due to storage for two weeks alternately indoors and outdoors at tempera tures down to 0 F. The tests are continuing. Bad settling was reported on production Hex 50 Flat-Rite Under- ooater about six months old. Apparently this batch was made on the formula carrying 2 pounds of aluminum stearate, subsequently replaced by 3'pounds of calcium stearate. Experimental batches of Rex 50 were made using these quantities of soaps, also certain surface active agents* After two weeks' storage the calcium stearate shows slightly better sus pension properties than aluminum stearate. When Acto 450, Armeen C or AM Ac 118,5 c are used in addition to calcium stearate, there is an observable improvement in suspension. The samples will be recbecked after extended storage. #148 - Examination of White Lead Some progress has been made in accumulating deta on tests of undercoaters and priming coats of varying white lead carbonate content for use by the L.I.A. White Lead Research Ccu.'.ttee, No work was done during the month on the following projects: #163 - One Coat House Paint #160 - Painting of Bricks #112 - Fire Retardant Paints 0007-SWP-0451B3 0007-SWP-000114554 ALLIED RESEARCH LABORATORIES Ileport of Investigations For the Month of May, 1946 M. VAN LOO jjh77 - Pigment Studies flork continues on the study of white pigment opacity factors. Paint Type III - 01eore3inous Hat In this series of tests flat wall paints were made using single opacity pigments up to 18,000 Holley units. The total pigment volume including extender was maintained at 25.14 gallons. The vehicle solids were maintained at 19.04 gallons. The total yield was held at 100 gallons. Type III Opacity Values Opacity So .Ft./Lb. Dry No. % Br. 913 CR 932 CP. 952 CR 972 CR 9B2 CR 10B 461 L 1271 1403 1533 1897 1901 2030 2132 2140 2173 2229 XX 592 Zinc Oxide 86.9 Lithopone 88.7 Anatase Ti-Cal 90.7 Ti02 Anatase , 84.8 Zinc Sulphide 87.1 Ti-Ear HH 84.0 T102 Anatase LO 85.3 Titanox AA B5.0 Titanox RC HT 87.1 Titanox RC 88.0 TiOg Rutile (R 200} 86.2 T102 Rutile (R 510) 84.9 66.0 85.9 181.0 106.2 88.8 160.5 181.0 105.5 201.0 230.5 64.3 57.5 44.4 79.3 69.2 162.0 139.5 91.3 77.8 78.5 67.3 144.4 124.2 150.0 124.0 100.2 e2.8 93.3 78.7 176.0 151.3 209.0 168.5 49.2 41.4 (42.7) (69.6) 66.8 53.6 101.6 104.6 71.1 56.1 128.0 155.0 54.0 44.5 89.7 92.5 64.2 115.8 129.0 Type IV - Interior Gloss Enamels Additions to tabulation given on page 6 of the April report. &09L- % Br. 912 CR 932 CR 953 CR 973 CR 983 CR 2140 Titanox RC 86.1 132.2 114.8 95.9 (65.9) 2173 Ti Pure'R 200 88.5 (268.0) 210.0 177.4 142.8 (114.8) A comparison of the above tabulation under Type III above with those values given earlier under Types I end IV is rather surprising in that many of the pigments show a lower efficiency than in either of the other types. 0007-SHP-045184 0007-SWP-0001 2- - II. VAN LOO Cont. #L77 - Coni. It was postulated that this difference must be a dispersion effect. In order to prove this point two series of tests were made based on flat wall paints used in the Type III series above. In each series paint A is a normal flat-standard grind. Paint B is Paint A reground to a 5 Hegman rating. Paint C consists of a mixture of two bases. Base 1 contains the opacity pigment ground to enamel fineness. Base 2 contains the extender pigment "stirred in." The final composi tion of Paint C is identical with. A and B above. Paint D consists, of a mixture of two bases, Base 1 as under "C" above and Base 3 which is identical with Base 2 except that the extender has been "ground in." Series I Opacity So. Ft ./Lb. p,t 972 CF Paint A "B "C "D 131.0 208.0 155.0 135.0 Series II 1405 dry Ooacity Pigment - 20 F Extender Paint A B C " D. 91.4 94.9 98.5 114.0 From the above the importance of dispersion i3 evident, thereby accounting for many of the seeming discrepancies between Type III and Types I and IV. A second comparison of basic importance was to determine whether or not there is one contrast ratio at which it would be more suitable to make comparisons between paints and pigments. The first approach was prac ticol. A contrasting background was prepared using a white, a pink and a green enamel. It was felt that this background represented the maxima contrast that would be expected to be covered by one coat with a good grade interior enamel. 0007-SWP-045185 0007-SWP-000114556 -3- M. TAN LOO Cant. ^177 - Cont. Using an Enr.meloid made with 270 pounds 2220 dry, a normal brush-out was made on a 4 ft. x 4 ft. panel over the contrasting back ground, Thi3 just barely accomplished complete hiding. The spreading rate was 587 sq.ft./gal. The theoretical opacity at 95% C.E. calculates to cover 575 sq.ft./gal. for the above paint as compared to a spread of 722 oq. ft. at 95% C.E. and 434 sq. ft. at 97% C.R. Therefore, the selection of 95% as a practical contrast is indicated. Comparative brightnesses on the t;hito, pink and green back ground areas are 84.4%, 75.8% and 76.0%, respectively. Another epproach to the problem of selecting contrast ratio at which pigments could be most suitably compared was to formulate paints based on comparative opacities at different contrast ratios. There is little difference botweon points end the relative quantities of pigments used whether a contrast ratio of 93, 95 or 97$ be used for setting up the comparative paints. Therefore, a 95% C.R. scene thoroughly practical and suitable for general comparisons between pigments and paints. The third basic factor affecting pigment opacity strength con sidered during the month was c. study of extender effects. It was found that the extender functions as vehicle T<hen it is properly dispersed and the quantity is not so great that High Dry Hiding effects are obtained . The chart below is presented to provo the above point. One hew term is introduced here, H.P.V.C. meaning Hiding Pigment Volume Concentration. 1403 Dry - Oil Type Vehicle Lbs. TiO^ Gal, P.V.C. No Extender Sq.Ft./Lb. H.P.V.C. at 95% CR p.v,c. Extender Sq.Ft./tb. H.P.V.C. at 95% CR Lbs. 20 F/ Gal. 1. 5.84 5.84 173 36 5.84 286* 3.77 a. 11.02 11.02 180 ff 11.02 175 3.50 3. 15.68 15.68 150 It 15.68 144 2.05 4. 19.85 19.85 125 u 19.85 120 2.58 5. 23.65 23.65 108 n 23.65 106 >1.88 *7bis is apparently a High Dry Hiding effect. 0007-SWP-045186 0007-SWP-0001 -4- M. VAN LOO Cont. - Studies in flat InlJ. Print Formulation Bint. r?iT 1 Paints A new revision for Flat-Tone White has been developed and sent to Cleveland for distribution. Fork on this formulation Indicates that the sticky brushing and after-body tendencies of the present formula nere due primarily to the reactivity of 461 L. Arrangements have been node with the Auxiliaries Eeportcent for the establishment of a speci fication for 4G1 L that will insure the manufacture of a pigment which will meet the requirements for Flat-Tone White and tints. Semi-Lustre Work ms continued during the month on the development of a formulation for Semi-Lustre Thite, based on the use of CV 7013 (20 gal lon tall oil P.E. maleic rosin, linseed varnish). Two. formulations were developed, one based on a pigmentation of 461 L end 2132 dry and the other on 451 L and 140." dry. Hie two formulas bave been sent to Cleve land as possible alternate formulas for Semi-Lustre, Then tall oils be come available. The raw material costs are as follows! Pigmentation Vehicle Cost Semi-Lustre White Alternate A Formula 8-22-45 50# 2168 dry 192# 461 L 475# 2132 ' (3348)E .(48) 091.20 Serai-Lustre VZhite Formula 8-22-45 50# 2247 dry 192# 461 S 475# 2132 " AV 59 ' (48) 096.47 Semi-Lustre White Formula OJ 927 J 30# 1389 dry 192# 461 L 475# 2132 CV 70 13 ('18) 589.91 Semi-Lustre White Formula OJ 951 J 125# 2247 dry 25# 1989 " 360# 461 L 225# 1405 " CV 7013 (48) 0104.89 A sample of Wet-Egp Paint Thinner was obtained from the Thompson-Hayward Chemical Company for tost in Semi-Lustre white. This material is recommended for its slow rate of evaporation; long wet edge time, and non-toxic odor. One of the main points of interest in the claims for this Bateriol is the fact that it will not dull the gloss or causo flashing. 0007-SWF-045187 -5- M. VAH LOO Coat. //162 - Cont. To check these claims a number of Semi-Lustro White batches were made, introducing the volatile as: (a) (548) ( d ) Approximately 50 (348) and 50w (3020). (c) Approximately IOC# Wet-Ege Paint Thinner (d) Apprcsimately 50 (548) and 50% Fractionated (l4l). Based on previous tests t :o have found that the higher boiling fractions of (141) or (5020) are responsible for the drop in gloss exper ienced with Semi-Lustre. Therefore, it ms decided to fractionate (141) and use only the material boiling in approximately the sane range as the Wet-Ege Paint Thinner. The batch of Semi-Lustre made T.dth the Wet-Ege Point Thinner was similar in sheen to our present Semi-Lustre made rath (548) and was quite similar in 7/et edge to the batch mo.de with 50% (548) and 50/5 (5020) The Semi-Lustre made from the fractionated (141) and (548) was somewhat lower in sheen than th~ batch cede with the Wet-Ege Eiinner but it was definitely higher than the (540) ard (5020) batch. These results would indicate that a thinner similar to Wet-Ege Paint lhinner would be quite desirable la this rex. The cost using WetEge thinner would be prohibitive ct their currently quoted selling prices. However, because longer wet edge in Serai-Lustra would be desirable, and because Wet-Ege thinner is unusual in the absence of any dulling effects on Semi-Lustre, it would be worth while to investigate other sources of stpply. ' A wide variety of volatiles in the kerosene range have been collected to study the effects in Semi-Lustre of variations in evapora tion rate and solvent power. Miscellaneous Laboratory batches of SWP Gloss White, Ennmoloid White and Plat-Tone White iao.de with naphthunato and octoate driers have been checked for drying after storage for 7-1/2 months. The past readings .have only indicated very minor differences. However, after 7-1/2 months tho octoates ore showing slightly better drying than the naphthenates in the case of the Enaneloid White and SYJ? Gloss White. Chart fellows. y .;:?r ' .'..I ;s y .? i 0007-SWP-045188 i;-v; 0007-SWP-000114559 6- - M. VAN LOO Cont. -i. *162 - Cont._ Form ula Ho. Tv d g of Paint Uhan After PreDared 7 Days Hr* iiin. Hr. Kin. After 30 Days Hr. Kin. After 70 Days Hr. Min. After ?-l/2Ho. fir. Min. Drier Used 286 J Flat-Tone thite - 25 287 J ft ft - 25 - 51 - 51 - 50 - 50 - 45 - 45 - 30 Naphth. - 30 Oct. 288 J Enaneloid V/hite 1 35 289 J n ir 1 45 22 1 52 2 15 2 10 2 4 5 3 15 Nrphth. 2 20. 2 45 Oct. 291 J SRP Gloss Hhite 5 15 292 J tl ft H 55 5 2 5 5 40 5 20 5 20 6 22 5 47 6 15 Naphth. 5 20 Oct. vl Vf No noticeable difference in set-ling: was evident between the points node with naphthcnnte or octorts drier;. #97 - SUP 471 An article was prepared for publication under the title, "Is It Safe to Paint My House Now?," discussing the subject of oil conservation house paints versus pre-war high oil paints. This is now in the hands of the Advertising Department. :*> :->9 j t.i Samples of Archer-Daniols Midland's #371 and #381 Grinding Oils were received for test. These oils ere polymerized and specially pro cessed linseed oils with the folloidng characteristics* #571 Oil #381 Oil Acid Value 4-6 4-6 Viscosity Color G-H+ 7-8+ G - B+ q + _ 11 Sp. Gr. .9*10 - . 944 .940 - .944 The two oils were corparod with tho regular oil conservation vehicle carrying (2; and (<i8) in tho SHF GIoos -Thitu and tint base fornuietions for drying characteristics, brushing, a.ia flow. As reported below the Archer-Danlels oils wore very sinilar in all rorpccts to the oil con servation vehicle. The paints are to be exposed on cedar panels at ChiC^G0 and reports will bo made on the comparative durability against the. regulars at some later date. i 0007-SWP-045189 0007-SWP-000114560