Though asbestos & its products may have been perceived as a health and environmental hazard, the truth is almost
the opposite. Asbestos Cement is very safe and eco-friendly.
THE REAL PROBLEM: Old Poorly Controlled Procedure
In the 1940's workers (without any proper masks) used to spray asbestos
in war ships as insulation and fire protection and later stripped the
same and after prolonged and excessive exposure, the asbestos related
problems manifested themselves from 1960's (after 20 years) in these workers
and asbestos earned a bad name.
Thus asbestos was banned in the USA in 1989. But soon after one and a
half years, the ban was overthrown by the US Federal Court because
the ban was not fair/ justified. However as bad news normally spreads
faster, the myth still remains that it is banned in the US!!
WHAT IS ASBESTOS:
Asbestos is a group of naturally occurring minerals. It is made up of
microscopic bundles of fibres that becomes airborne when disturbed.
In its natural state, asbestos occurs throughout the planet, in fact
it is found in two thirds of the rocks in the earth's crust the fibres
are released by erosion and carried by the wind & water, thus depending
on where you live, you are most likely inhaling between 10,000 and 15,000
fibres a day and ingesting many more. Also natural sources of asbestos
release more fibres into the air than industrial sources do. Asbestos
is a part of the dust, which is covering up the cities for countless centuries.
This offers a testimony to the fact that the human body is designed
to handle such doses of Asbestos fibres.
Water contains asbestos, anywhere from 200,000 to 2,000,00 fibres per
litre. In the regions of Quebec where the world' largest asbestos mines
are located, the drinking water contains up to 170 million fibres per
litre. However asbestos is harmless in water, as the problem is
not from ingesting the fibres, but from inhaling them in excess.
WHEN IS ASBESTOS HARMFUL:
It is a well know fact that anything in excess can tend to become a health
hazard. The same holds good for asbestos fibres. Asbestos is a hazard
only when it is continuously inhaled in excessive amounts and this continues
over a prolonged period (years) .The toxicity is so low that the disease
starts manifesting after 15 to 40 years: In the case of asbestos cement
products this does not hold good because of the controlled and eco-friendly
manufacturing technology. As per the International Agency for Research
on Cancer (IARC), Lyon : Brake linings and asbestos cement (where
the fibres are 'locked in ') are not listed as carcinogenic
whereas asbestos filter, textiles & insulation industries are listed,
even though asbestos cement industry accounts for more than 88 % of the
consumed fibres.
THE MANUFACTURING TECHNOLOGY OF ASBESTOS CEMENT PRODUCTS:
Asbestos Cement Products & their manufacturing technology are amongst
the most eco-friendly and safe technologies. The manufacturing
technologies are very simple and easily applicable all over India. The
asbestos fibre, used in small percentage, is imported normally from the
Canadian mines etc. where it is handled with due care and packed in tight
cakes wrapped in leak proof bags. These bags are opened under negative
air pressure in closed wet process mills, water is added to make slurry,
which is mixed with cement slurry, and thereafter the fibre is locked
for life. During this whole process the exposure of the fibre to
the environment is of few seconds. For e.g.; during the making of the
asbestos cement pipes, a one-month process, the fibre is exposed to the
environment for a couple of minutes during this period. The fibre remains
in a closed and wet circuit during this brief period making it impossible
to become airborne and be inhaled beyond the specified limits.
|