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Can you believe it?
The asbestos that can be seen everywhere in our lives is actually a class of carcinogens, and 1Kg of asbestos contains one million "needles", which seriously endangers human health.
Asbestos is now banned in Europe and the United States, but why is it still widely used in China?
What is Asbestos?
What we usually call asbestos is not actually a substance, but a general term for those naturally fibrous silicate minerals.
This type of mineral has a characteristic that distinguishes it from what we know as minerals.
That is, these minerals are naturally formed fibrous minerals, which are mined to look like fiber polymers, and they are handfuls of fibers that are torn by hand, and there is no need to deliberately process them.
Not only that, asbestos also has many excellent characteristics, which can well meet our production and life needs, such as acid and alkali resistance, fire and insulation.
Therefore, asbestos is often used as a variety of special materials in our lives, most of our common fireproof materials, most of them have asbestos, even the asbestos net used in the experimental class in middle school, the asbestos net that is heated under the beaker is also processed from asbestos.
As early as ancient times, the ancients had also discovered and began to use asbestos.
"The cloth of the fire and the, the must be thrown into the fire, and the cloth is the color of the fire. Out of the fire and vibrate, Hao Ran suspicious snow. ”
The special fire cloth recorded in the book of Liezi is actually made of asbestos......
Asbestos hazards
Although the application range of asbestos is very wide, the harm it exists should not be underestimated.
The asbestos we see is a handful of fibers, and such fibers are actually polymerized from finer fibers, which are generally only 5 microns long and cannot be detected by the naked eye.
Some scientists have estimated that 1Kg of asbestos will contain at least one million of these fibers, which are like "needles", which will unconsciously pierce our skin or enter our respiratory tract in the process of processing and using them.
Asbestos fibers under electron microscopy
What's even more terrifying is that due to their extremely small weight, each "needle" is like a speck of dust, which can be suspended in the air and water for weeks or even months, causing lasting effects on the surrounding environment.
In 1987, the International Agency for Research on Cancer (IARC) released a list of carcinogens, in which asbestos was clearly labeled as a class of carcinogens, which could directly cause harm to the human body and then induce cancer.
Asbestos mainly causes lung cancer in humans, and the carcinogenic mechanism is easy to understand.
People who have been exposed to asbestos for a long time will inhale a large number of tiny asbestos fibers suspended in the air, which will enter the lungs along the respiratory tract and pierce into the alveoli and other tissues like "needles", which will induce lesions of these tissues over time and eventually lead to the occurrence of cancer.
According to a statistic made by the World Health Organization, about 125 million people around the world are engaged in asbestos-related work, and among these people, about 100,000 people die every year from asbestos-related diseases.
Based on the hazards of asbestos, more than 66 countries in the world have issued bans on the use of asbestos in various fields......
Why is asbestos still widely used in China?
The mainland is one of the world's largest producers of asbestos.
Many people may wonder why asbestos is still produced and used in large quantities on the mainland.
Speaking of which, although asbestos is listed as a class of carcinogens, there are differences in the hazards of different types of asbestos.
We usually classify asbestos according to its composition and internal structure, and divide it into two categories, one is serpentine asbestos (chrysotile asbestos), and the other is amphibolite asbestos (including crocidolite, amosite, etc.).
Serpentine asbestos (chrysotile asbestos)
Amphibole asbestos (including crocidolite, amosite, etc.)
Among these two types of asbestos, amphibole asbestos is extremely harmful and has strong carcinogenicity, so the mainland has also included it in the ban list, prohibiting the manufacture, sale and use.
The other type of serpentine asbestos is relatively less harmful, as long as the protective measures are in place, it can avoid harm to the greatest extent.
Therefore, it is this kind of asbestos that is widely used in the mainland today......
Of course, from a health point of view, serpentine asbestos can also cause harm to human health, so it is ideal to completely ban all asbestos.
But the reality doesn't allow us to do that.
Because of the development to this day, asbestos has an irreplaceable position in various fields, such as in the application of fireproof materials, looking at the world, there is no more cost-effective material than asbestos.
Why doesn't the mainland want to ban asbestos completely?
Until we find a suitable replacement, we simply can't stop using asbestos.
The only sustenance is to make science and technology more advanced, and wait for scientists to develop better materials......