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Increasing Awareness: Asbestos Ancient History, Characteristics, Types, Uses, Health Effects.

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Presentation on theme: "Increasing Awareness: Asbestos Ancient History, Characteristics, Types, Uses, Health Effects."— Presentation transcript:

1 Increasing Awareness: Asbestos Ancient History, Characteristics, Types, Uses, Health Effects

2 Asbestos Definition  The word asbestos derives from a Greek word meaning “inextinguishable”

3 Asbestos definition  Either of two incombustible, chemical- resistant, fibrous mineral forms of impure magnesium silicate, used for fireproofing, electrical insulation, building materials, brake linings, and chemical filters.

4 What is Asbestos?  Natural Mineral (Rock)

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7 Brief History  First known use: 2,500 B.C. pottery and hut insulation Greeks spun and used in cloth Used for wicks in sacred lamps Pottery  Diseases in the 1950s-1960s  1971 Asbestos listed as a hazardous air pollutant

8 Characteristics  Aerodynamic  Aerodynamic

9 Characteristics  Aerodynamic  Chemically Resistant  Hydrophobic  Heat resistive (1250-2000 deg. F)  Flexible with High Tensile Strength  Aerodynamic  Chemically Resistant  Hydrophobic  Heat resistive (1250-2000 deg. F)  Flexible with High Tensile Strength

10 Characteristics continued  Size Fibers (1-5 microns, human hair is 80) Fibers>Fibrils>microfibrils

11 Asbestos Types  Chrysotile (white) >95% of all asbestos (white) Hair-like

12 Asbestos Types  Amosite (Brown) 5 % of all asbestos Needle Like

13 Asbestos Types  Crocidolite (blue) <1 %

14 Asbestos Types  Chrysotile >95% of all asbestos (white)  Amosite <5% of all asbestos (brown)  Crocidolite (blue) <1  Tremolite  Anthophyllite  Actinolite

15 Asbestos Types  Tremolite, Anthophyllite, Actinolite Little commercial value Usually a contaminant of other asbestos or material type

16 Vermiculite?

17 Why Use Asbestos?  Heat resistive (1250-2000 deg. F)  Chemically resistive  Great acoustical reduction properties  Good elastic/tensile strength properties  Poor conductor of electricity  Great binder

18 Asbestos Containing Materials  Acoustical Materials  Fire proofing  Heat resistive materials  Ceiling and floor tile  Sheet rock mud  Plaster  Insulation

19 Materials cont.  Decorative spray for texture  Roof shingles, siding shingles, sheets, etc.  Mastics, glues  Welding booth panels and soffits  Window glazing  Some paints

20 Health Effects  Caused by Inhalation (most likely) Ingestion Injection

21 Asbestos Diseases  Asbestosis (lung scarring)  Lung cancer  Mesothelioma (cancer of membrane lining lungs)  Pleural plaques, pleural thickening  Colon, stomach, esophagus, pancreas cancers

22 Respiratory Systems Defense Mechanisms  Nose, Mouth,  Trachea, Bronchus, Bronchioles Turbulent airflow Smaller pathways  Mucous Sticky layer, catches some particles

23 Respiratory Systems Defense Mechanisms (Continued)  Cilia Hair-like Coated with mucous and move particles back up through bronchus  Alveoli (air sacs) O2/CO2 exchange Macrophage Cells

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25 Macrophage Cell

26 Smoking/Asbestos Relationship

27 Asbestos-Smoking-Lung Cancer  Asbestos exposure=5X greater chance lung cancer  Smoking no asbestos exposure=10X greater chance lung cancer  Asbestos exposure of Smoker=50X greater chance of lung cancer. Newest figures now say 88X greater chance

28 “King of Cool” - Steve McQueen  Died of Mesothelioma in 1980 at the Age of 50  Exposed to Asbestos from Work/Hobbies Brake Pads on Cars Construction Work Ship Work

29 What Level of Exposure is Safe or Permissible????????  0.1 fibers per cc of air  5 f/cc, 1 f/cc, 0.1 f/cc in last 10 years

30 Asbestos Health Benefits

31 Crowds gather at Market and Laguna streets to flee the Great Fire. Building at lower center right still survives along Laguna. Almost all others pictured here burned.

32 The 1906 San Francisco Great Fire as seen from a ferry boat in the Bay.

33 Closing Thought. Keep Health Effects in Perspective  Expected deaths per 100,000 Motor vehicle1,600 Coal mining441 Diagnostic X rays75 Lightning3 Hurricanes3 Asbestos in buildings1

34 Acknowledgement  Created by Larry Hagel, Industrial Hygienist, Kyron Environmental Consulting and Training  Formerly with Spokane Public Schools and a member of AASA’s Urban Healthy Schools Coalition  Email lhagel@kyronenvironmental.comlhagel@kyronenvironmental.com  AASA is dedicated to healthy school environments, visit http://www.aasa.org/focus/ http://www.aasa.org/focus/


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