TABLE - I






MEASUREMENT METHODS FOR THE EVALUATION
OF FIBROUS DUST


METHOD                  ANALYTICAL MEAN            FEATURE EVALUATED


1. Fibre Count             1.1 Phase contrast Microscope          Morphology

                        1.2 Scanning electron microscope/       Morphology and
                               energy dispersive analysis       elemental analysis

                        1.3 Transmission electron microscope     Morphology and
                            energy dispersive analysis           elemental analysis

                        1.4 Light scattering (FAM)             Morphology


2. Mass Concentration      2.1 Weighing                       Mass

                        2.2 Light scaterring                  Mass

                        2.3 Beta-radiation                    Mass

                        2.4 Infrared spectroscopy              Mass

                        2.5 Differential thermal analysis         Mass


3. Identification            3.1 Polarized-light microscope          Morphology and
                                                           refractive index


                        3.2 X-Ray diffraction                  Crystallographic
                                                            parameters

                        3.3 Electron microscope with             Morphology and
                              microprobe                       elemental analysis



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