Asbestos is a naturally occurring mineral fiber mined from the earth. It is strong, flexible, and resistant to heat, chemicals and electrical conditions. They occur in two groups. The serpentine group includes white (chrysotile) asbestos. The amphibole group includes brown (amosite) and blue (crocidolite) asbestos.
'Bonded' is a type of asbestos which is firmly embedded in a material that these materials are unlikely to release measurable levels of asbestos fiber into the air if they are left undisturbed. Therefore, they generally pose a lower risk to health. Example of bonded asbestos-containing materials include asbestos cement products (flat and corrugated sheeting used in walls, ceilings and roofs, molded items such as down pipes), vinyl floor coverings.
Another type of asbestos is Friable. Friable is used to refer to asbestos-containing materials that can be easily reduced to powder by hand, when dry. These materials are more likely to release measurable levels of asbestos into the air when disturbed, and generally pose a greater risk to health. Friable asbestos-containing materials include sprayed asbestos fire retardants
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