Document 7RxV7kQKbDpg2wMMG7eq5Rex8

CROSS INDEX: Pigments Dept. Calcium Carbonate Extender 110,138 p*ta 301-Line 1 MEMORANDUM REPORT #1-131 CC: Mr. J, B. Bullitt Mr. J. W. Iliff Mr. C. R. E, Merkle Mr. Stuart Graves Mr. K. 0. Lampert - Lab. Lab. Lab. Lab. Lab. Philadelphia Laboratory*5', ,\s }| * July 21, 1947 JelQ'53 CALCIUM CARBONATE EXTENDER IN HOUSE PAINT In Memorandum Report #M-101 dated March 19, 1947 paints pre pared at the Philadelphia laboratory with calcium carbonate and other calcium extenders are described in respect to their initial properties. It is stated in that report that somewhat poorer brushing is obtained from paints containing calcium carbonate but that the difficulty could probably be corrected by use of a false bodying agent. A series of paints with calcium carbonate extender has been obtained from the Pigments Department for exposure in Texas on yellow pine in Series #9494* These paints are from the Pigments Department Exposure Series #Si>33, a copy of the exposure memorandum being in the Philadelphia Laboratory file. The paints were tested for thinner content, brushing, level ing, visual gloss, A.S.T.M. gloss'and hiding by the Pigments Depart ment. A number of the paints are described as having good brushing. In order to check this conclusion, four selected paints from Series #9494 have been brushed out in the laboratory. Paint #2, in which calcium carbonate is used as the extender in a high oil vehicle, is found to have very good application properties. This indicates that brushing will not be a difficulty if exposure series now in pro gress show the use of calcium carbonate to be desirable. Two paints with the oil saving vehicle which are reported as having good brushing in the Pigments Department *.s memora^pm show only fair brushing accord ing to our standards and show the usual drag on lapping in after five minutes. This is an effect of the oil saving vehicle rather than calcium carbonate. The four paints are listed in the attached table together with original data reported by the Pigments Department and our observa tions on brushing. PHILADELPHIA LABORATORY WFS;me I'J tjfji ,, v, , /Jx.V ,, WILLIAM F. SINGLETON TABLE 1 . COMPOSITION & REPORTED GLOSS mB<5voaO pcH +3 d re *- c m I o > A V\ tO vO -4r f<N CM H MO4 ro *4* CO# to to OON IN SN nCo*- H iHoi H 4o4 OH >03 45 CO pHH o 4f*2l 2 20(HaO^i3OH A> od +a>> *0rJ 4O3 od od aH % i--j :jd&tN(.TJ O I d S3 d *rt ISS t? k4 "(O *PHH 'HI M UN O CM O to UN 4" t * -4 Otr\ * O -4 CM O CM UN UN 4 ' UN UN , -sj* & O*n CM ft Sr S -4* IN CM* pH -p dS3 d H CM fS H ft-4 {CoHtf & S3 oeq w*4 P3>H43 a w P33h 3W g aw g M W W 3 S & t3 fi H oo W sAWl n 3ta *p a.8 tdi > d d q cs rt rH S3 a P p M PS to pH o dO > U *PHi v?H4 Wd oo > pdE( rd* dP, ca p O On CM On uv u\ CN <5 pH d a p *rl r oH p Sh CO o ooo ON ON to pH "SO CMO n u n P pH CM pi s DUP030003008