ANALYST WORK SHEET 3.

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The Detection of Quartz in Talc by Differential Thermal Analysis Principle Differential thermal analysis (DTA) involves the measurement of thermal reactions which are induced in a sample as it is being heated at a constant rate.

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AMP NO. 1 2 3 4 5 6 7 8 9 10 11 12' 13 14 15 16 17 18 19 20 21 22 TABLE I I I .

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ANALYST WORK SH EET 3.

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C T ' F ' A Method J 4-1 Asbestiform Amphibole Minerals in Cosmetic Talc Part I: X-ray Diffraction Method Part II: Optical Microscopy and Dispersion-Staining Method Introduction The method which has been adopted for the detection of amphibole minerals in cosmetic talc is the generally accepted method of x-ray diffraction.

FINAL REFORM X-IU Y POWDER DIFFRACTION ANALYSES OF COMMERCIAIJ) to.

an h e s a m p l in g s t r a t e g y d e c is io n s T made at the tim e of the basic epidemiologic ys- study of an industrial dust hazard ultim ately de ore term ine the m ethods th at will be used to evaluate aal exposures in later regulatory or control situations.

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REFERENCES (FDA Docket No. 94P-0420/CP 1) SECTION II.

2 i 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 TABLE I I INTERLABORATORY COMPARISON OF ANALYTICAL RESULTS FOR TREMOLITE IN COSMETIC TALCUM-TYPE POWDERS ________________________________ RESULTS___________________________ __________ N.

FD FORM 431 (5/73) P R E V I O U S E D I T I O N IS O B S O L E T E .