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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Argus Contracting
701 Southampton Rd, Benicia, CA 707 746-1642
Cal Inc
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2040 Peabody Rd, Vacaville, CA 707 446-7996
Petrochem Insulation Inc
110 Corporate Pl, Vallejo, CA 707 644-7455 |
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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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