Document RJ1v6KV20mdZDvBEQM6VMQGjB

1937 HOUSE FAINT PBIMBH STUDIES OF 19V) SERIES IlYirf statement This report on house paint primers is supplementary to "Outline of House Paint Primer Studies," dis*vi'in-.tsd at the Technical and Operating fjptigg of November, 1935* The general. description of formulations and physical l^giracteristics of these primers may he found hy referring to the above bulletin, copies may be obtained on request. The purpose of the 1935 exposure series was to cover the basic futures of house paint primer formulations in a systematic manner. A study was j of the fundamental features of house paint primer formulations as suggested fS'- ^the current literature and the leading pigment companies such as the Rational SjfcV.. : Co., Rew jersey Zinc Co., Titanium Pigments Co., Krebs Color & Chemical Co. Jtti Sberwin-fillicmsi The various primers in the series were formulated so that ' 'complete study could be made of the vehicle and pigment composition. p The vehicle was studied from the .standpoint of the proper propor- ,_rns of volatile to non-volatile, raw oil o.'ccossed oils and the effect of \ presence of resins. The pigments were stv.ixf.d from the standpoint of pigment i concentration, and composition. The . .'tur.** pigments used were white lead -febonate, lead titanate, zinc sulfide and titanium pigments. The white lead con- W-' was held quite high in most of the formulations. The inerts studied were |?P*ca dead burned calcium sulfate, mica, asbestine. Cel it e #110, aluminum pow- serecite, said flake graphite. Six competitive exterior house paint primers ^4hase& on the market along with white lead in oil were also included in these ^*te, 0007-SWP-000006665 The exterior primers were applied on 6 inch clapboard siding both ii-rrain white pine and fiat-grain yellow pine. All paints were applied out-of- v:;fe" fad allowed to dry for 43 hours before recosting. One-third of each panel fepAinted with a guide paint of S.W.P. Outside White (present Titanium Dioxide vith three coats being applied and reduced according to label directions: The balance of each panel was prhned with an experimental exterior with two additional coats of S'JT Outride 'Trite on the center section and i-coat over the end section, producing 3 coat end 2 coat jobs respectively. All were exposed vertical, south in the latitude of Chicago for a period of two which is regarded as sufficient for preliminary indications of failure. fvations On Two Coat System 1* Upon examination of these tests, it becomes quite evident that the coat system as advocated by several competitive paint manufacturers, particuly Devoe and Reynolds is very much inferior as to durability compared to the Sard three coat practice. All of the tve cost exposures now show very clearly lack of opacity due to erosion rnd a considerable number ere showing a definite ng type of failure, indicating loch ct p *&jwr protection to the wood. Among the competitive exterior primers there were none in the two work which appeared equal in general appoa? anr.e to SW? Outside rTnite which '&fv; -.applied as three coat work. The degree of y allure cn the two coat system is r-more evident on the Southern Yellow pine v-hon on the Northern $hite Pine le. This difference could not be noted in the three coat system with primer. All formulations carrying leao titanate are showing a definite ^cking type of failure end in several cases where a definite percentage of mica 0007-SWP-000006666 -3- * 1x1 conjunction with the lead titanate, the failure was very had. ^'failures are apparently due to the extremely soft film that is produced by of lead titanate and flaky inerts, such as mica. .Among the competitive exterior primers exposed the only two that Ik #"#**11 in good- coniition are Benjamin Moore's Moorwhite Primer and U. S. Gutta tts Barrelled Sunlight Outside TJndercoater.11 The Barreled Sunlight Under pay also produced the hest appearing two coat joh as it was rather high in On all of the 77 experimental two coat systems tested, a definite icking and checking failure has started except those shown below. The film SKegrity of these is still good, hut as stated above, the opacity and general IgSpearcnce is inferior to the regular three coat self primed system such as used |g|ft.::the "guide." ifcftlners of Satisfactory Performance to Bate ||&;1S S Pigment, 90# White Lead; 10# Zinc Sulphide: For vehicle see previous report- pigment, 90# White lead, 10# Titanium Dioxide: For vehicle see previous report. Pigment, 76# WhiteLead, 9# Zinc Sulphide, 15# Asbestine Pigment, 76# WhiteLead, 9# Titanium Dioxide, 15# Asbestine Pignent, 76# WhiteLead, 9# Titanium Dioxide, 15# Mica Pigment, 38# WhiteLead, 37# Titanox B, 25# Asbestine (MW-401 Primer) Pigment, 40# WhiteLead, 10# Mica, 40# Lead Titanate, 10# Asbestine Pigment, 100# White Lead Pigment, 83# White Lead, 12# Aluminum Fowder Pigment, 30# White Lead, 39# Leaded Zinc 35/65* 9# Titanium Dioxide, 8# Asbestine, l4# Aluminum Powder 0007-SWP-000006667 -4 - ^factory Performance to Date Continued pigaent, 30$ White Lead, 39$ Leaded inc, 9$ Titanium Dioxide, S$ Asbes- f*;- tine, l4$ Mica* inum Pd. pigment, 35$ White Lead, 4y$ Leaded Zinc 35/^5 10$ Titanium Dioxide, iurv`<t> A.3onostT.no Pigment, 35$ Thite Lead, 45$ Leaded Zinc 35/b5 10$ Titanium Dioxide, 1C$ Asbestine pigment, 6g$ Leaded Zinc, 2$ Titanium Dioxide, 30$ Asbestine pigment, 35$ White Lead, 45$ Leaded Zinc 35/^5. 10$ Titanium Dioxide, 10$ Asbestine **, * * . treat ions of Three Coat System In making a direct comparison of the three coat system where the i exterior primer and two additional coats of liouse paint were applied versus igegular three coat system, we find that several of the exposures show a slight race cracking. These are principally the lead titanate types where the under ' remained soft. The guide coat of Hx 471 Si-7? Outside White self-primed j? od condition on all exposures. The two and three coats of white lead in sv V ^.showed bad checking and bad dirt collection. 0007-SWP-000006668 1*:-