ASBESTOS MINERALOGY Fibrous silicates. Thin crystalline fibres.

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Presentation transcript:

ASBESTOS MINERALOGY Fibrous silicates. Thin crystalline fibres. Split longitudinally. Common types: (i) chrysotile (white) - serpentine (ii) amosite (brown) (iii) crocidolite (blue) (iv) tremolite (v) actinolite (vi) anthophyllite.

ASBESTOS PROPERTIES Tensile Strength. Heat resistant. Chemical Resistant. Can be woven. Insulating properties.

ASBESTOS USES More than 3,000. Friction products (brake, clutch). Building products (asbestos cement). Insulation (fire). Fabric (blankets, gloves etc).

ASBESTOS ASBESTOS RELATED DISEASES Asbestosis scarring of lungs reduced lung function can cause death high concentration and time.

ASBESTOS ASBESTOS RELATED DISEASES Pleural Plaques thickening of pleura not fatal. Mesothelioma

ASBESTOS RELATED DISEASES Mesothelioma cancer of pleura or peritoneum rare, most associated with asbestos invariably fatal associated with low exposures as well latency 15-50 years blue and brown most potent.

Lung Cancer ( Bronchial carcinoma ) ASBESTOS ASBESTOS RELATED DISEASES Lung Cancer ( Bronchial carcinoma ) mainly associated with high exposures all types of asbestos smoking greatly increases risk. Multiplied risk ( smoking x asbestos )

CONTROLS Eliminate ( do not use at all ) Substitute (replacements available for most products). Enclosure (buildings and industrial processes). Isolation (often possible in buildings). Engineering (ventilation commonly used). Work Process ( to reduce exposure by rotation) Protective equipment (respirators).

ASBESTOS LEGISLATION ( FMD Asbestos Process Regulation, 1986 ) PEL 1 f/ml. of air Exhaust equipment. Protective equipment.( clothing/resp) Medical examinations. ( at least 2 yrs ) Monitoring-personal ( < 3 mthly ) Training.