1.1 The purpose of this test method is to provide a concentration estimate of asbestos, if detected, in milled mineral powders, reported as the mass of asbestos per mass of sampled talc. 1.2 The procedure outlined in this test method is intended to disaggregate and disperse asbestos bundles to increase homogeneity for improved statistical detection and increase the ability to size individual particles. The procedure described neither creates nor destroys asbestos; however, the asbestos observed for quantification may not represent the physical form of the asbestos as sampled. Therefore, results cannot be used to estimate asbestos structures per gram nor provide estimates of exposure for risk assessment purposes. 1.3 This test method is applicable for estimating the concentration of asbestos starting from 0.01 % (assuming a minimum fiber dimension of 0.5 by 0.025 m), but can vary depending on the specific analysis parameters and asbestos type. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This test method will be useful to mineral producers as a way to qualify products for use as a raw material. This test method is needed to enhance existing methods historically used by mineral producers, such as cosmetic and pharmaceutical trade associations (CTFA/PCPC, USP, and so forth). It will also be useful for regulatory agencies to ensure public safety of mineral product end users.
Keywordsasbestos; mass; mineral powder; TEM
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top