Asbestos - Asbestos Overview of Hazards and Regulations A...

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Asbestos – Overview of Hazards and Regulations A summary of the properties and health hazards of asbestos and the DOSH regulations on asbestos October, 2009
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Topics Covered Properties of asbestos Uses of asbestos Health hazards of asbestos Activities resulting in potential asbestos exposure Asbestos regulations Where to get more information and help
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Asbestos Exposure - General Overview 1.3 million workers are exposed in the U.S. – primarily in the construction industry. Asbestos removal and building renovation Exposure in general industry: - manufacture of asbestos products - automotive brake and clutch repair - Housekeeping and custodial work
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Properties of Asbestos Asbestos ore Naturally occurring fibrous minerals Good tensile strength Flexible Heat resistant Electrical resistance Good insulation Chemical resistant Asbestos fibers Because of these unique properties, asbestos was used extensively in variety of products.
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Types of Asbestos - Chrysotile - “White asbestos” - Amosite - “Brown asbestos” - Crocidolite - “Blue asbestos” “Blue Asbestos”- Asbestos fibers, high magnification Most commonly used: Others: Tremolite (sometimes found in vermiculite) Actinolite Anthophyllite
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Vermiculite – some products contained asbestos Vermiculite insulation in attics
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Uses of Asbestos Pipe insulation Surfacing insulating materials Reinforcement of materials Fireproofing Acoustic and decorative plaster Textiles Asbestos insulated pipe Asbestos insulated boiler Asbestos has been used for centuries, but greatly increased during and after World War II in ship insulation and the following: Use has greatly declined since the late 1970’s
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Examples of Uses of Asbestos Vinyl asbestos flooring Sprayed-on fireproofing material Sheet vinyl containing asbestos These products may be found in homes and buildings constructed before 1981.
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Damaged asbestos pipe insulation This damaged pipe insulation is a health hazard to persons working around it, handling it or removing it. Asbestos fibers are visible on the torn edges.
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Asbestos Mill Board Asbestos millboard was used in the construction of walls and ceilings, especially around furnaces and wood-burning stoves, where insulation and fire protection was required. Most varieties of asbestos millboard typically contained between 80% and 85% asbestos.
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Asbestos gaskets– may be round, flat or impregnated with waterproof sealant Asbestos fabric in HVAC system Damaged asbestos gasket Asbestos in gaskets and fabric
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Asbestos Roofing Material used from 1920’s to 1970’s
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Cement-asbestos pipe (Transite) Cement-asbestos pipe, sometimes called Transite, was used underground and above ground in years past and may show up in pipe replacement jobs, building demolition jobs or excavations.
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Asbestos Ceiling Tile - used until about 1980 Usually white and in 1’ by 1’ or 2’ by 4’ sizes Tile close-up
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This note was uploaded on 01/06/2012 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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Asbestos - Asbestos Overview of Hazards and Regulations A...

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