![]() ![]() ASTM D60571996 Edition, December 10, 1996Complete DocumentStandard Test Method for Determining Concentration of Airborne Single-Crystal Ceramic Whiskers in the Workplace Environment by Phase Contrast Microscopy
Includes all amendments and changes through Reapproval Notice , 2011
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![]() Description / Abstract:
This test method covers the sampling methods and analysis
techniques used to assess the airborne concentration of
single-crystal ceramic whiskers (SCCW), such as silicon carbide and
silicon nitride, which may occur in and around the workplace where
these materials are manufactured, processed, transported, or used.
This test method is based on the collection of fibers by filtration
of a known quantity of air through a filter. The filter is
subsequently evaluated with a phase contrast microscope (PCM) for
the number of fibers meeting appropriately selected counting
criteria. This test method cannot distinguish among different types
of fibers. This test method may be appropriate for other man-made
mineral fibers (MMMF).
This test method is applicable to the quantitation of fibers on a collection filter that are greater than 5 μm in length, less than 3 μm in width, and have an aspect ratio equal to or greater than 5:1. The data are directly convertible to a statement of concentration per unit volume of air sampled. This test method is limited by the diameter of the fibers visible by PCM (typically greater than 0.25 μm in width) and the amount and type of coincident interference particles. A more definitive analysis may be necessary to confirm the identity and dimensions of the fibers located with the PCM, especially where other fiber types may be present. Such techniques may include scanning electron microscopy (SEM) or transmission electron microscopy (TEM). The use of these test methods for the identification and size determination of SCCW is described in Practice D6058 and Test Methods D6059 and D6056. The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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. ![]() |