Transcription of MDHS87 Fibres in air - Guidance on the …
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MDHS87 Fibres in air - Guidance on the …
MDHS. Methods for the Determination of Hazardous Substances 87. Fibres in air Health and Safety Laboratory Guidance on the discrimination between fibre types in samples of airborne dust on filters using microscopy November 1998. introduction determination of results above the clearance indicator demonstrates that the enclosure is not clean, even if 1 At present there are two approved methods for some of the dust is non-asbestos. However, in determining airborne fibre concentration; one for asbestos exceptional circumstances it can be applied to clearance (MDHS 39/41) and one for man-made mineral Fibres testing. For example in asbestos removal operation, after (MMMF) (MDHS 592). Both methods are based on cleaning or where non-asbestos dust is suspected of collecting particulates by drawing air through a membrane being drawn into the enclosure from operations outside filter which is analysed at 500x light microscopy. As the and increasing the fibre' concentration (eg gypsum analysis relies on manual fibre counting of a relatively particles from plaster board, or MMMF Fibres from glass small number of Fibres , the method is recognised as one of fibre insulation).
MDHS Methods for the Determination of Hazardous Substances Health and Safety Laboratory INTRODUCTION 1 At present there are two approved methods for
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