1 University of Southern Maine Environmental Health and Safety
2 Awareness History Definition Types of Asbestos Health Effects Asbestos Containing Materials Materials to be Aware of Asbestos at USM How to Avoid Exposure
3 Asbestos can be a serious health hazard. This training presentation is designed to educate employees at the University of Southern Maine about asbestos and the hazards it can bring to the workplace. It is important for USM employees who may be exposed to asbestos to be aware of potential hazards and avoid exposure.
4 Asbestos has been used for over 2,000 years. It was first used by the Greeks who named it asbestos, meaning inextinguishable. The first diagnosis of an asbestos related disease was in 1924.
5 Deposits of asbestos are found throughout the world: Russia (largest producer), Canada, South Africa, and Australia. Asbestos is extracted by open cast mining. It is crushed, processed and refined into a wool like fibrous mass. Use of asbestos in building products peaked in the Sixties and early Seventies.
7 Asbestos has been used in hundreds of products word wide. It became popular because there are large quantities of it available, it is easily and quickly accessible, and it is low in cost. Asbestos has several unique properties: It does not burn. It is strong. It is a poor conductor of electricity and heat. It is impervious to chemical corrosion.
8 OSHA defines asbestos as: the name given to a group of naturally occurring minerals that has been used in certain products, such as insulation, tiles, building materials and vehicle brakes to resist heat and corrosion. Asbestos includes the mineral fibers: Chrysotile Amosite Crocidolite Tremolite Anthophyllite Actinolite
9 There are three most common forms of asbestos: Chrysotile (white) is the most common. Amosite (brown / offwhite) Crocidolite (blue)
10 Chrysotile is the most common form of asbestos. Accounts for 95% of asbestos currently in the United States. Fibers are resilient to heat, insoluble in water and are considerably strong, they can even be woven into fabric. Chrysotile is considered to be a carcinogen.
11 According to the Environmental Protection Agency, amosite is the second most commonly used type of asbestos. Usually brown or off white in color. Fibers are long and thin and can be broken into very small fibers. Amosite is considered to be a carcinogen.
12 Crocidolite is the third most commonly used form, making up roughly 4% of the total asbestos in the United States. Usually more flexible than amosite or chrysotile. Blue in color and less heat resistant. Crocidolite is considered to be a carcinogen.
13 Asbestos related diseases take a long time to develop. Usually, diseases show up years later in people who have been exposed to asbestos. When inhaled, most asbestos fibers are exhaled back out, but some can stick in the lungs causing scarring which can lead to disease over time.
14 Asbestos can cause a wide range diseases. Fibers associated with these health risks are too small to be seen with the naked eye, so it is crucial to take proper safety precautions. Smokers are at a higher risk of developing many asbestos related diseases. People who are exposed to high quantities of asbestos, over long periods of continual time, are more likely to develop an asbestos caused disease.
15 The following are potential health effects of asbestos exposure: Lung cancer Mesothelioma Asbestosis Pleural plaques Pleural thickening Pleural effusions
17 Asbestosis Scarring of lung tissues, caused by fibres reaching the alveoli. Scarring results in reduced lung capacity and increased risk of lung cancer. Symptoms include extreme shortness of breath. Not always fatal but extremely debilitating. Lung Cancer Cancerous tumours in lung tissue. Symptoms include shortness of breath, coughing (up blood). Nearly always fatal.
18 Mesothelioma Cancerous cells form on the membrane covering the internal organs. Most commonly on the pleura covering lungs. Cancerous growth inhibits normal lung tissue function. Symptoms: shortness of breath, cough, pain in chest. Always fatal life expectancy 6 24 months from diagnosis. Pleural Plaques Fibres lodged in the lung tissue push through and scratch the inside of the pleural membrane. This causes inflammation and areas of scarring.
19 Friable: can be crumbled or reduced to powder by hand pressure. (EPA) Friable Asbestos releases fibers into the air more readily. Non-friable: not easily reduced to powder. Many types of non-friable ACM can also release fibers if disturbed. Regulations usually deal with friable asbestos.
20 The EPA defines three categories of ACM: Surfacing materials: ACM sprayed or troweled on surfaces for acoustical, decorative, or fireproofing purposes (plaster, insulation, etc.). Thermal System Insulation: Insulation used to inhibit heat transfer or prevent condensation (pipe lagging, pipe wrap, block bat and blanket insulation, cements, muds, etc.). Miscellaneous Materials: Other, largely non-friable products and materials such as floor tile, ceiling tile, roofing felt, concrete pipe, outdoor siding, and fabrics.
21 General maintenance staff Electricians Plumbers Gas Fitters Painters and Decorators Joiners Plasterers Demolition Workers Shop fitters Construction Workers Roofers Heating and Ventilation Engineers Telecommunications Engineers Fire and Burglar Alarm Installers Computer Installers Architects, building surveyors and such
22 Friable Material Where Found Use Asbestos Cord Asbestos Tape, Strip & Tubing Fire resistant theater and welding curtains, protective clothing Spray Applied or Trowledon Insulation Preformed Thermal Insulation Electrical insulations and equipment Electrical installations and pipe joints Auditoriums, stages, metal shops, high temperature occupations Steel I-beams and decks, concrete ceilings and walls, hot water tanks, pipe elbows, boiler casings Boilers, pipes, hot water tanks Electrical element insulation Electrical conductor insulation, high temperature pipe joint insulation wrap Fire and heat barrier Thermal and acoustical insulation, decorative coverings Thermal insulation, condensation control Artificial Snow General commercial use Decoration Artificial Fireplace General commercial use Decoration Corrugated Asbestos Paper Hot water, steam pipes Thermal insulation
24 Structural fire protection on steel work, behind radiators and boilers, inside doors, Also used for acoustic insulation, lining, ceiling tiles, general building board (resists moisture ingress) Interior walls of older fume hoods in chemistry labs. Only to be removed by a licensed contractor
25 Thermal insulation for pipes/boilers Common lagging up to 15% asbestos Quilts/blankets up to 100% asbestos Often has protective foil, paper or wire covering Only to be removed by a licensed contractor
26 Roof sheets, flue pipes, guttering, down comers, roof tiles, permanent shuttering Only 10-15% asbestos (usually white asbestos) Fibres are tightly bound with Portland Cement, unlikely to give off fibres unless badly damaged Sheets should be removed whole and kept wet
27 Floor tiles, stair nosings, sink pads, toilet seats and cisterns Can also find asbestos in the adhesive used with floor tiles Up to 25% asbestos Fibre release unlikely under normal use
28 Fire blankets, gaskets, cable insulation, flash guards Up to 100% asbestos Release of fibres depends on material All 3 types of asbestos used pre1970, only chrysotile since
29 Used as fire protection and acoustic control for structural steelwork Up to 85% asbestos Fibre release likely if disturbed. Can also degrade as it ages
30 Commonly referred to as artex. Low percentage of asbestos Fibres may be released if the material is drilled or sanded
31 Asbestos Paper Products Backing on fibre boards, floor tiles Covering on electrical equipment insulation, pipe insulation Damp proof course External Building Panels Asbestos boarding can be used for external cladding
32 Asbestos containing materials should not be broken, sanded, scraped or drilled unless absolutely necessary. If working around or near ACM avoid contact with the material. If you are concerned you might be working around ACM, contact your supervisor to get the area tested.
33 If you discover or disturb asbestos containing materials STOP work immediately! Prevent access to the area. Minimize spread of contamination to other areas. Notify your supervisor immediately!
35 Personal Protective Equipment Asbestos removal operatives wear: Disposable overalls (Type 5 Particle tight) Boots without laces, or boot covers Respiratory Protection
36 Respiratory Protective Equipment 3 types Disposable respirators with FFP3 filter Half Face Masks Full Face Masks
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