Document baeVongnGQn57naweqE88v5Zy

FILE NAME: CTFA (CTFA) DATE: 1974 Mar 6 DOC#: CTFA020 DOCUMENT DESCRIPTION: Unpublished Internal Report A M E R I C A N C V A N A M TD C O M P A N Y CO N SU M ER PROD UCTS DIVISION M. O , B O X 1 S 1 , C L l R t O N , N E W J E R S E Y 0 7 0 1 ! \ . ARRR ,0e Su1 taa.di. M a rc h .16, 1974 Dr. Horman Este in The cosmetic, Toiletry and Fragrance Assoc,, 1625 Eye Street, Bt.W. Washington, B.G. 20006 ins, Dear Hermans X ashed our microscop ist at the Stamford Research Laboratories to comment on the "Final Report of CTFA Talo Subcommittoo" and sent a copy to Dr J, Longfellow who requested that X provide you with as many copies as you deem useful. * > I, therefor., am enclosing eight ft?) copies of the report. If moro as needed., please let me know. FDBdt F , D. Barbueaio LoGiudice/WCD/0242 * ti* tv-' if : -1" I ' STAMFORD RESEARCH LABORATORIES RESEARCH SERVICE DEPARTMENT REPORT ) - t~o fir . Frank B crfeuscio FSCM Microscopy materiAi, Method A s b e s t o s a T a l c charse Ki, 22096-35 C i 4 6 - W 5 ) VvTOX REPORTED BY ]},, W. D&vlffi opT. ConBiimer P r o d u c t s ; | nov. wo. BATE REPOflTEO 2^5-7^ - test M icro sco p ica l ^ au ain atio n date submitted 1 -1 1 - 7 4 \ NOTEBOOK REFERENCE g - 1 0 9 3 . nu. 110.111 3 *4 - * S * o } -I-n-t-ro-d-u?-c-t-1-ofet J * ai | Our commenta on. the data you hare aubmifeped concerning the Eejpt* of Health, Education and Welfare's microscopical method for determining the amount of aahestoa In talc may; beet he divided into tiiro parts} the test procedure itself and the h3actions raised;by the Q TF A subcommittee alter a round-robin trial, Test Procedure I 1.Sampling, I- . ' * ; ' l J The method of sampling should be specified. Kicro- riffling would probably be universally acceptable for powders of allisiaca and compositions, - tV 2. Size of Sample, \ * 1 f . , The feast specifies a weight o f one mg,;idepending on the sixe-range of the talc product, this may be too much or too W r.\, little;to be truly representative. J / ' j 3* Criteria for a Fiber, j *. .. / ..* Two of these criteria (ii and lii) may become contra- . dietcry, These criteria stipulate that fibers must have & length ' of 5 micrometers or greater and a width of 3 micrometers or jess. Thus, ut fiber 50 micrometers long and 5 micrometers wide (perfect ly possible) would be in conflict with itselfi The aspect ratio and : the length suffice to define the fiber dlmenalonsj 'width ', bo opeoilfled, j. , j * . h. Area to be Examined, , i. i ' *.| - Assuming that one mg, is representative,, the should not area suggested for examination is 48 sq, mm. Shis seems unneoos- eerily large for routine microscopy, for it involves approximately 100 traverses of 50 fields each at 4001, or approximately 5000 fields If the sample is well-dispersed, as specified, 10 equally-spaced v traverses, involving about 500 fields, should ha adequate. m -i l^oGiudice/WCD/0243 >- mm --I-uro-c?--*,*?*'u."x-sif^mwinepj*,J<'i<* wit-..---a-V* 220.96-55 E2 b**~' 2 General goHgggjit * r ,*. j Our Microscopy Laboratory can perfora this test. However, we feel that Che time required would probably be one tp- two day per e&mplB, if the figures are to be; cleaning- ful,, f ! n ,, Objections by the OTFA Subcommittee [ Objection SJo. 1, | ; ' This objection. seems invalid, since th*test re-' * Tt quires that both indices ofrefraction exhibited by a fiber h below 1.574- if the fiber is identified as chrysctile. Also, jit seems unlikely that an experienced minerolosist would ,oonfuse fibrous talc,or edgewise, platy talc, with >3 chrysotile, as other optical characteristics, i.ey, detailed morphology, interference color, change of relief on. rotation, etc., ji/duld usually be distinctive. . Object!one Bo. 2, 3, 4, 5, 6 and 7. : ifhese all appear to be valid. General Comment It is quite obvious, from the disparity bf results obtained in the round-robin trial, that the test, as presently designed, ia not practical. Of the seven alternatives sug- * geetedj Ho. 1, (Modified Optical Method) still seems to offer the beat chance of successful application by the industry. .-i 4 , :-r t ' ) ,, "** J * a T - .*l * * l * l - J. B,:W, Davis 1 , Lodiudice/VyCD/0244 .