Vietnam has nearly 40 units producing roofing fibro-cement containing asbestos moon. These units annual production of about 70 million m2 of roofing, using about 10 thousand employees. Vietnam in the 10 countries using asbestos in the world, estimated at over 60,000 tons / year.
Fast, cheap, party
Mr. Pham Anh Tai, a pig farm in the town of Long Thanh, Long Thanh district, Dong Nai province, said fibro-cement roofing is suitable for roof barn, farm better insulation due respect. With the purchase of just over 20,000 / interest, equal to half of the religion, so this is the most appropriate choice. Example of implementation (class) not fast sheet but sitting was very fast. On the other hand, the cost of the frame because fibro-cement roofs are not children, not picky, farmers break the raising enjoyed solution.
In 48 years (fibro-cement presence in Vietnam from 1963) and development presence in Vietnam, thanks to low-cost, good quality reviews, fibro-cement roofing industry has not at least five months splendor. But in 1990 and earlier, having heart fibro-cement roofing rooftops become a ‘dream’ for many families. Class had to contribute significantly to the ‘revolution’ permanent housing, workshops, warehouses for the country.
Dr. Nguyen Van Chanh, Chairman of the Department of Construction Materials, University of Science City, said: “But years ago, fibro-cement containing asbestos are widely used in the urban to rural areas. But in a dozen years, this is only true for roofing deep-lying, remote, equipped with an emergency in case of floods destroyed, the sideburns. ”
Suitable in Vietnam
While materials such as pictures, la, bamboo and increasingly short life exhausted, scarce, low memory, to haul away, insulation, fire well, especially not to mention durability in the coastal climate, fibro-cement is suitable for coastal works in Vietnam.
Asbestos roofing is not oxidized because infected brackish, rust in wet environmental conditions, such as metal roofing, in addition it also aging, deformation due to the influence of temperature like plastic roofing.
Le Hoa, senior civil engineer with more than 20 years, was working for a construction company stock in Phu Nhuan District,, insisted if not sporting the class again and again, fibro-cement roofing panels can not Asbestos can ‘breathe’ half century. Du hazardous but in a poor country like Vietnam, the asbestos will be the choice of many people.
Vietnam has about 17 asbestos ore has been discovered in Cao Bang and Hoa Binh, Son La, and Thanh Hoa and Phu Tho. However, this is a small field, with reserves of 10,000 tons to 60,000 tons. On the other hand, asbestos at the mines are of poor quality, rough, short fiber, high elasticity does not have the ability to exploit commercial applications in products.
Therefore, to meet the needs of the industry in the country, mainly in the areas of construction, each year Vietnam imported about 60 thousand care ingredients asbestos. Providing asbestos countries for Vietnam include Russia, Kazakhstan, China and Canada, Brazil.
than 90% of the asbestos imported quantities used for production of fibro-cement roofing sheets. In addition, this material is used in the manufacture of brake pads truck, steam pipes, boiler insulation materials for laboratory …
Has not been adequately studied
According to Dr. Le Van Trinh, Director of the Institute of Scientific and Technical Research and the Protection of Labor, Viet Nam now has more than 10,000 workers directly exposed to asbestos at approximately 40 units producing roofing. Most of the units manufacturing fibro-cement roofing sheets using old technology, publishing backward causing asbestos pollution to the environment. This makes the working environment asbestos concentrations many times higher than the standard allows. If you are looking for the best Asbestos Removal Contractors, visit Chicago Asbestos Removal to get more information about our services.
Business incubation period of lung cancer 15-20 years, asbestos does not cause immediate damage, their effects usually appear after 15-40 years. Meanwhile, research on the health effects of asbestos to workers short-term manner.
Dr. Son Lam Lake, Institute of Applied Material Science in Ho Chi Minh City Institute of Science and Technology of Vietnam, for that research on the effects of asbestos on workers directly involved producing roofing fibro -cement in Vietnam has not yet been studied, a full tracking.
More recently, between 2009, Hospital Construction Ministry of Construction has conducted periodic health checks for 563 employees working in the three manufacturing fibro-cement roofing. Results did not detect workers with silicosis disease to asbestos. Earlier, in 2004 the same results of this hospital showed that only four of the 1,032 workers directly working in the environment that uses a light asbestos lung asbestos contaminated dust.
A doctor who works in a labor safety declined to be identified that further research, the results of this ancient medical examination of the impact of asbestos workers is insufficient. In the world, every year 90 thousand people died of asbestos-related diseases can not yet Vietnam has good resistance to toxins so.
Tim alternative materials
Seeing the harmful effects of asbestos, in recent years, scientists Vietnam has put a lot of effort to find out what material can replace.
TS. By the National Optics Institute of Technology under the Ministry of Trade and Industry, has selected finely ground pulp, fiber, polyvinyl alcohol (PVA) – a product of the petrochemical industry, along with additives to replace asbestos. Scientists at the Institute of Science and Technology of Vietnam also studied PVA fiber content, combined with coconut fiber have been numerous the replacement flower asbestos. Research results in the ice bar, new materials are evaluated not lose fibro-cement with asbestos.
These studies have also been delivered to the production enterprises to provide roofing market. However, this new material still can not compete with traditional heart fibro-cement due to its higher price. On the other hand, due to the habit of using so people are still not aware of all the harmful effects of asbestos.
“In the near future, scientists in the country will be completed are the materials that are low cost, quality not inferior to asbestos, results in scale experiments have successfully than in the past,” Dr. Outdoor Son Lam confidence said.