Document oeQ5m11zvZJeyKMQay162vXNX

' @ @> a MDs 4 rw nt ARS CC W. H. Ashton Semple Sherman Waggoner BABY PRODUCTS COMPANY RARITAN N.J. 08869 June 6 1977 SUBJECT TO NIOSH Membrane Filter Method for Evaluating Airborne Asbestos Fibers Method Fibers Applied to JBP for Determination of Talc in Airborne Respirable Fraction ~ 0503.01 Mr. G. Lee 729-10 In a previous memo Jan. 25 1977 under this title we reported the results of applying this NIOSH method for measuring fibrous dust particles in an airborne JBP dust cloud The cloud was created during shake dis- pensing of JBP 118 from the regular 9 oz container We found that % of the particles in the dust cloud were fibrous by NIOSH definition e.g. any particle having an aspect ratio of 1 or greater and which is 5 microns or longer is classed as a fiber In this present experiment the same thing was done however only the respirable sized particles 10 microns and below were collected from the dust cloud and measured Results Total concentration - Fibrous concentration Respirable particles = 244 - Respirable fibers = 4.4 These data indicate the fiber concentration at approximately % of the total airborne respirable size particle concentration Discussion The fiber content of the total airborne talc cloud was found to be abou%t from the 1/25/77 study and the fiber content of the respirable fraction only the cloud found to be % by the present experiment Experimentally these results are in the same range and we conclude that NIOSH definition fibrous particles are about evenly distributed present in airborne JBP through the particle size range by R. S. Russell Russell JNJ 000277397