Asbestos as a contaminant
Most respirable asbestos fibers are invisible to the unaided human eye
because their size is about 3.0-20.0 µm in length and can be as thin as
0.01 µm. Human hair ranges in size from 17 to 181 µm in width.[6] Fibers
ultimately form because when these minerals originally cooled and
crystallized, they formed by the polymeric molecules lining up parallel
with each other and forming oriented crystal lattices. These crystals thus
have three cleavage planes, just as other minerals and gemstones have. But
in their case, there are two cleavage planes that are much weaker than the
third direction. When sufficient force is applied, they tend to break
along their weakest directions, resulting in a linear fragmentation
pattern and hence a fibrous form. This fracture process can keep occurring
and one larger asbestos fiber can ultimately become the source of hundreds
of much thinner and smaller fibers.
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Alphabetical Listings
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Asbestos Control Ctr
92 Hamilton Dr # H, Novato, CA 415 883-7856
GPI Environmental Management
1516 Grant Ave, Novato, CA 415 892-9016
IBS Building Maintenance Co
San Rafael, CA 415 453-9027 |
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As asbestos fibers get
smaller and lighter, the more easily they become airborne and human
respiratory exposures can result. Fibers will eventually settle but
may be re-suspended by air currents or other movement.
Friability of a product containing asbestos means that it is so soft
and weak in structure that it can be broken with simple finger
crushing pressure. Friable materials are of the most initial concern
due to their ease of damage. The forces or conditions of usage that
come into intimate contact with most non-friable materials containing
asbestos are substantially higher than finger pressure. |
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