AATCC 20:2018 pdf download.Fiber Analysis: Qualitative
2. Use and Limitations
2.1 This test method describes a number of prtwcdures microscopical examination. solubility in solvents, melting point, refractive index, and micro-Fourier Transform Infrared Spectroscopy—which should be used in combination to identify a fiber type. For identifying certain fibers some procedures will be ftund to be more effective than others.
2.1.1 For example, microscopical cxaminatlon is particularly useful in charactenting the natural fibers. It must be used with caution on man-made fibers since they are frequently produced in a number of modifications which alter the longitudinal or cross-sectional appearance. In addition, man-made fibers may contain some or no delusicrant or other additive particles. Filaments of a given type may vary in site or cross-sectional shape. Individual filaments may base two or more component sections of the same or differ- exit generic types.
2.1.2 Even natural fibers show a fairly wide variation in typical cross-section. No specific specimen will look exactly like the pictures published. A suflicicnt number of fibers should be examined to cover the range of appearance in any specimen.
2.2 Successful identification of fibers depends upon cxpcncnce and familiarity with the fibers. The identification of an unknown fiber is best made by companson with properly identified fibers used as reference standards. For this rcason it is desirable to have available at least one representative fiber sample from each generic class of fibers, which can be used (‘or comparatise identification.
2.3 This test method provides means for identifying the generic classification of the common fiber types. In special cases, as when dealing with fibers not described in this method or attempting to distinguish between products of difkrent suppliers of the same generic types. one must consult standard texts on fiber identification or technical bulletins issued by suppliers of man-made fibers. See refi.renccs Section 13.
3. Terminology
4.3 In preparing, dispensing and han-dling the reagents outlined in Section 6,use chemical goggles or face shield, im-pervious gloves and an impervious apron.Concentrated acids should be handled only in an adequately ventilated labora-tory hood. CAUTION: Always add acid to water.
4.4 All poisonous and flammable re-agents should be mixed and handled only in an adequately ventilated laboratory hood. CAUTION: Acetone and ethyl al-cohol are highly flammable and should be stored in the laboratory only in small containers away from heat, open flame and sparks.
4.5 An eyewash/safety shower should be located nearby and an organic vapor respirator should be readily available for emergency use.AATCC 20 pdf download.