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Asbestos Awareness. Manitowoc School District. What is Asbestos?. Naturally occurring family of minerals Formed by Magnesium and Silicon Hollow microscopic fibers are nearly indestructible & can be densely packed Three main types of asbestos Chrysotile (white, most common)

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asbestos awareness

Asbestos Awareness

Manitowoc School District

what is asbestos
What is Asbestos?
  • Naturally occurring family of minerals
    • Formed by Magnesium and Silicon
  • Hollow microscopic fibers are nearly indestructible & can be densely packed
  • Three main types of asbestos
    • Chrysotile (white, most common)
    • Amosite (brown, 4% of ACBM, short fiber)
    • Crocidolite (blue, green)
  • Invisible to the naked eye
commercial uses
Commercial Uses
  • Popular building Material because:
    • Strength
    • Will not burn
    • Will not corrode
    • Good insulator
    • Economical
  • Categories of building materials
    • Surfacing, Thermal Systems Insulation, Miscellaneous
building material uses
Building Material Uses
  • Surfacing Materials
    • Sprayed-on/troweled-on:
      • Fire proofing
      • Acoustical
      • Decorative
  • Thermal Systems Insulation
    • Insulation on piping, boilers, tanks, ducts
  • Miscellaneous Materials
    • Floor tiles, ceiling tiles, roofing, siding, lab equipment, gloves, curtains, brake liners
examples of materials containing asbestos
Examples of Materials Containing Asbestos
  • Floor tiles/mastics
  • Ceiling tiles
  • Pipe insulation
  • Fireproofing
  • Transite panels
  • Wall board/mud
  • Plaster walls/ceilings
  • Other materials
health effects
Health Effects
  • Inhalation hazard
    • Fibers are particles, fibrils (5 microns)
  • Respiratory system
    • Upper and lower system
  • Health problems associated with asbestos exposure
    • Asbestosis
    • Mesothelioma
    • Lung cancer
dose response relationship
Dose-Response Relationship
  • No acute effects
  • Chronic effects with latency period
    • 15 to 45 years to develop
  • Response is directly related to exposure
  • Permissible Exposure Limit (PEL)
    • 0.1 f/cc - 8 hour Time Weighted Average
  • Air clearance for abatement projects
    • 0.01 f/cc
fiber release concerns
Fiber Release Concerns
  • Friable vs. Non-friable
    • Disturbance of materials matrix
  • Compare with abatement levels
  • Airborne asbestos is invisible
  • May take up to 40 hours to settle
  • Damage & deterioration
  • Smoking& asbestos
    • Synergistic relationship
controlling exposure
Controlling Exposure
  • Identification of asbestos containing materials (inspections)
  • Minimizing disturbances
    • No cutting, drilling, abrading, floor care
    • Notify employer if suspect a disturbance
  • Cleanup procedures/practices
    • 14 hours of additional training
    • Filtered vacuums, wet methods, engineering controls, drop clothes, minimize dust, ect...