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Flits iiio Marshall Laboratory Oebobep 38* 195
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Bxpoaure Series #3.2266 Indicated that a polytetyl aetbaeryiate emulsion paint ai susceptible to mildewing* Its rdr to eonpare the mildettSag of the meXsiom paint m and without various figngieidal agents* Estpesw Series #12621 was prepared* After few Mattel outdoor tapeeare the data la %eef> fieieijt for- a valid onelusioii on wXMm&m although tentative indications show that the mildewing m the' aimlaleh paint is greater thm m Ko, 40 Outside White.
An attempt was made to obtain coea* rapid qualitative information on i<olng by expfttfhit email panels iireotXy to fungal .attach la a chamber la which the relative \htaddity was 100# and tli temperature 25C* fMs vm don# at the feat Con trol Section of araaaelll Cimmimln Pej^nrlaant*. from these m~ poisisras it was possible to tow the following aoaalaalaaai
(1) .Polybutyi wrtbae*ylate emulsion elea? la mere susceptible to mildewing ttwa poXyfemtyX. aethaerylai solution clear which compared favorably to "Bulum" + 73 fedpaarr K clear. This may to part h to to tea em&aiflar la the oamlaion*
(2). XMtodeopl aaleaa&e acid and Bupomol Ma which ws uaad as stabilisers* attract -mllto*
C3) Pigmentation of polybutyl methacrylate esnialon and solution with -50 decrease* the juiMow resistance of both. The mider growth on tha panels of planted polybntyl methacryl-
toat solution was slightly gabts? than that m the panels con-
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(%) fm tongioides to deareaaing ptr of effective* neaa efi Sowicid 0, Shlvlm ttetaa* phenyl mercury lent, and aloalne* silieoftaoride* Bowicide 0 aM Shlrlsn Hntr. sits* about equal la effectiveness, both showing no mildew growth after thirty 087$. Alunlnua BilieofluorMw showed n mildew resistance what soever*
it would appear free'the above zmalmimm that the formulation of $ s&Xd@w*rsi$tnt polybutyl methacrylate anulalon paint util require the presence of fungicidal agent* Biaoa Shlrlaa Estra causes yellowing, BowieM 0 would see to be a goo choice*
m another series that was sent to dnesseill the emulsion and lotion petoba wane trashed m both whit pine panel and a botodarlted panels, in m as did the paint ft tba bondcrlbed panels supports mildew whereas the paint on the whit pin panels did support mildew* Shis would lead a to onolui that -the mildew attack is through the wood (possibly by leeching of niter .soluble nutrients) Ho attempt was mad of correlating this with outside durability teata. As a matter of fast the results, because of the 'nature of the test, should not be opted as esmolwalve* Om .further conclusion could b drawn fro this series, Th@ tt-dcdeeyl Bnloaolo'aeld to the solution point did mot-cause m extensive mil dewing as the Modeeyl aalaanie mid la. the #?auXsi<m point .to attest will be mad to correlate this with hardness and i®ulsrity of surface*
fro the Delaware oppoanro it was evident that dirt col lection would also b a major problem, The addition of fungicidal agents would retard the growth of mildew, but would have no effect dn dirt collection* To study the dirt problem Sapoaune Series #12855 was prepared to which the pignuts were free halMns TlO* (v-i6j, chalk-resistant TiOo (W-50)* end a 50/50 mixture of w-16* and w*50.- This study should give mm information on the effect of Wo pigment variation on oloanllnoaa mad film integrity of mljtmwl methacrylate emulsion paint. 1 results have yet bean obtained m this series. Action Taken s
A new .eapoaure sOrtoo will be prepared by MvdMlUm .to determine if mildew does attack through the wood. The oapoanro series now on ensure will be evaluated periodically and'any new potets of internet will b investigated. -
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DUP030003453