BS ISO 1888:2022 pdf download – Textile glass — Staple fibres or filaments — Determination of average diameter

BS ISO 1888:2022 pdf download – Textile glass — Staple fibres or filaments — Determination of average diameter. BS ISO 1888 specifies three test methods used for determining the average diameter (i.e. the average value of actual diameters) of staple fibres or filaments in a textile glass product. 4 Method A:Longitudinal profile 4.1 Principle Fibres or filaments placed in a liquid medium having a refractive index differing from that of the textile glass are viewed in profile under a microscope and the diameter measured. 4.2 Apparatus 4.2.1 Microscope,equipped with the following: An eye-piece with a built-in micrometer graticule,the eye-piece and objective together giving an overall magnification of at least x400 and preferably x1 000.The resolution of the microscope shall permit measurement to the nearest 0,5 um or better. A system permitting lateral and rotational movement of the microscope stage. -An illumination system. This system may be replaced by or used in conjunction with a microprojector on which specimens can be measured using a transparent scale (preferably a curved scale)。