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Introduction Potential Asbestos fibres are identified using the following method: an initial visual examination is carried out of the sample to tease out any potential fibres and to assess the current treatment required. sample treatment takes place if required, to isolate any fibres. a more detailed search using a stereo microscope takes place to classify the fibre types. any fibres found are mounted onto microscope slides and immersed in a Refractive Index Liquid (RI), this is to simulate as close as possible the original specification of the fibre Polarised Light Microscopy is now used to positively identify any asbestos materials within the sample. The following properties are used to identify the types of asbestos fibres present: Colour Pleochroism Morphology Birefringence Angle of Extinction Sign of Elongation Dispersion Staining Course Information This module provides theoretical and practical knowledge in the techniques of fibre counting of asbestos air samples using phase contrast microscopy (PCM). In conjunction with the P404 - Air sampling and clearance testing for asbestos - . Discipline: Asbestos Difficulty: Advanced

Introduction Potential Asbestos fibres are identified using the following method: an initial visual examination is carried out of the sample to tease out any potential fibres and to assess the current treatment required. sample treatment takes place if required, to isolate any fibres. a more detailed search using a stereo microscope takes place to classify the fibre types. any fibres found are...

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