Document p2ger2np8b2NYnVYpBmZnBXMw

FILE NAME: RT Vanderbilt (RTV) DATE: 1956 July 17 DOC#: RTV136 DOCUMENT DESCRIPTION: Confidential J-M Memo RE Microexamination of Talc from Eastern Magnesia Talc, COv Burlington VT CONFIDENTIAL JOHNS-MA.NVILI.K RESEARCH CENTER M i-m onirifi MU2-38 Dati Jy ly 171, 1956 MICROSCOPIC .EXAMINATION OF TALC FROM EASTERN MAGNESIA TALC. CO., BURLINGTON, VERMONT An exam ination was made o f powdered t a l c , su p p lie d by E astern M agnesia Tale Company and used by Johns-M anville C orporation. This m a te ria l was compared w ith the throe follow ing commercial talcum powders. Johnson and,Johnson Baby Powder Cashmere Bouquet Mennen The r e s u lt s o f th e exam ination a re a s f o llo w s ? A, E a ste rn M agnesia T ale Company -- Over 95# o f th e sam ple was t a l c , iig3Si^CRq 'OH)^ Of th is amount, le s s than 10# could be.considered elongated or fib ro u s appearing the balance consisting essen tially of platey talc p a rtic le s th at ranged in p a r tic le siz e from 125-d Total im purities were estim ated micro s c o p ic a lly to be l o S3 than 5# o f the sam ple a s f o llo w s ; C h lo r ite , (Mg, F e JjA l, F e)^ D olom ite, Ca, Mg (003)2 P y rrh o tite Fei^jjS Tremol t i e , ^aoMgjSitfOgg (OH)-, - Major Im purity Minor Im purity - Tra e Impur i 1y - Minor Trace Im purity Johnson and Johnson baby Powder -- The sample co n sisted e s s e n tia lly of talc oovf ewr e9lc0h# wo ferewheicloh,n gwaatse dp laptaeryt i c(lpeasr.tic lTehse 1p2r5in/(c.itpo a<l 5i/m<()p uarnidty l ewsass dthoalonm1i0te# present in trace amounts. C, rCaansghminegre inBosuiqzuee.ft ro--m TlrGieOMs-afmtoplele swsas theasns e n tia llyLepssla ttehyan p1a0r#ti colfe sth eof tatalclc was elo n g ated p a r t i c l e s . The sam ple a ls o co5 An.ta in e d tra c e s o f d o lo m ite and m ag n esite, MgCO-,. D, Mennen Talc The. -sample c o n s is te d e s s e n tia lly o f ta lc ov er 90# of which wire p latey p a r tic le s ranging in siz e from 175^cdown t o c S / f . Less than 10# of the ta lc p a rtic le s had a fib ro u s o r elongated appearance. Trace amounts o f m agnesite were p resen t. tIanlcmuym oppoiwn idoenr; Uw3eidth byth-eJo.ehxncs~epffteionnvllolef tihs e s ismli gilha rt lyin hmiglhneerrailmo gpiucraitly cocmo nptoesnitti,ont.h, e p a rtic le size d is trib u tio n , and shape to th a t of the th ree re p resen tativ e and commonly used talcum powders th a t were subm itted fo r com parison. cc: C,, L, S hockler - M anvlle P la n t (3) A,,. 3R, WCiulmlmiianmss H. L. King, Jr. PR,,esle.,,arcKhadMeyi,n eJrra. lo g ist CRMC-HT-TALC-000045