Asbestos Exposure - FAQ's
What is asbestos?
"Asbestos" is the name given to a group of minerals that occur naturally as
masses of strong, flexible fibers that can be separated into thin threads and
woven. These fibers are not affected by heat or chemicals and do not conduct
electricity. For these reasons, asbestos has been widely used in many
industries. Four types of asbestos have been commonly used:
- Chrysotile, or white asbestos (curly, flexible white
fibers), which accounts for about 90 percent of the asbestos currently used in
- Amosite (straight, brittle fibers that are light gray
to pale brown in color);
- Crocidolite, or blue asbestos (straight blue fibers);
- Anthophyllite (brittle white fibers).
Chrysotile asbestos, with its curly fibers, is in the serpentine family of
minerals. The other types of asbestos, which all have needle-like fibers, are
known as amphiboles.
Asbestos fiber masses tend to break easily into a dust composed of tiny
particles that can float in the air and stick to clothes. The fibers may be
easily inhaled or swallowed and can cause serious health problems.
How is asbestos used?
Asbestos has been mined and used commercially in North America since the late
1800s, but its use increased greatly during World War II. Since then, it has
been used in many industries. For example, the building and construction
industry uses it for strengthening cement and plastics as well as for
insulation, fireproofing, and sound absorption. The shipbuilding industry has
used asbestos to insulate boilers, steampipes, hot water pipes, and nuclear
reactors in ships. The automotive industry uses asbestos in vehicle brakeshoes
and clutch pads. More than 5,000 products contain or have contained asbestos,
some of which are listed below:
- Asbestos cement sheet and pipe products used for water
supply and sewage piping, roofing and siding, casings for electrical wires,
fire protection material, chemical tanks, electrical switchboards and
components, and residential and industrial building materials;
- Friction products, such as clutch facings; brake
linings for automobiles, railroad cars, and airplanes; and industrial friction
- Products containing asbestos paper, such as table pads
and heat-protective mats, heat and electrical wire insulation, industrial
filters for beverages, small appliance components, and underlying material for
- Asbestos textile products, such as packing components,
roofing materials, heat- and fire-resistant clothing, and fireproof draperies;
- Other products, including ceiling and floor tile; gaskets and packings;
paints, coatings, and sealants; caulking and patching tape; and plastics.