Cómo reparar las tejas de asbestos
Imágenes de Guido Mieth / Getty
Lo común en las casas construidas en el siglo XX es la masilla negra utilizada como adhesivo de azulejos o linóleo. Cuando quita ese revestimiento del suelo para dar paso a un nuevo piso, puede encontrarlo y preguntarse si es seguro eliminarlo.
Una arruga en esta pregunta: la masilla negra a menudo contiene asbesto. Se ha demostrado que el asbesto causa una afección potencialmente mortal llamada mesotelioma.
¿Cómo puedes saber si el adhesivo de tu piso contiene asbesto?
Si es así, ¿cuál es la mejor manera de eliminarlo?
¿Para qué sirve el asbesto?
El asbesto se utiliza para producir artículos como frenos y tuberías y también se utiliza en la construcción de pisos y techos (en estos dos últimos casos, integra una mezcla que también contiene cemento).
El asbesto se ha convertido en una materia prima ampliamente utilizada debido a sus diversas propiedades, entre ellas:
- Resistencia a altas temperaturas;
- Maleabilidad para tejer, etc.
Además, otra razón del gran interés de la industria en el asbesto es que es un material de muy bajo costo, ya que se encuentra abundantemente en la naturaleza.
El uso del amianto en Brasil
Brasil está entre los cinco países con mayor producción de amianto del mundo.
La mayor concentración se encuentra en el estado de Goiás.
El único amianto que se puede utilizar en Brasil es el crisotilo crisotilo , que pertenece a la clase serpentina .
Algunos de los productos más comúnmente fabricados con asbesto en Brasil son las tejas y los tanques de agua.
Techo de asbesto
Tanque de agua de asbesto
El crisotilo es el único tipo de amianto permitido en Brasil.
Asbestos in the Ancient World
Asbestos occurs naturally on every continent in the world. Archeologists uncovered asbestos fibers in debris dating back to the Stone Age, some 750,000 years ago. It is believed that as early as 4000 B.C., asbestos’ long hair-like fibers were used for wicks in lamps and candles.
Between 2000-3000 B.C., embalmed bodies of Egyptian pharaohs were wrapped in asbestos cloth to protect the bodies from deterioration. In Finland, clay pots dating back to 2500 B.C. contained asbestos fibers, which are believed to strengthen the pots and make them resistant to fire. Around 456 B.C., Herodotus, the classical Greek historian, referred to the use of asbestos shrouds wrapped around the dead before their bodies were tossed onto the funeral pyre to prevent their ashes from being mixed with those of the fire itself.
Others believe that the word’s origin can be traced back to a Latin idiom, amiantus, meaning unsoiled, or unpolluted, because the ancient Romans were said to have woven asbestos fibers into a cloth-like material that was then sewn into tablecloths and napkins. These cloths were purportedly cleaned by throwing them into a blistering fire, from which they came out miraculously unharmed and essentially whiter than when they went in.
While Greeks and Romans exploited the unique properties of asbestos, they also documented its harmful effects on those who mined the silken material from ancient stone quarries. Greek geographer Strabo noted a “sickness of the lungs” in slaves who wove asbestos into cloth. Roman historian, naturalist and philosopher, Pliny the Elder, wrote of the “disease of slaves,” and actually described the use of a thin membrane from the bladder of a goat or lamb used by the slave miners as an early respirator in an attempt to protect them from inhaling the harmful asbestos fibers as they labored.
Some scholars claim the word asbestos comes from the ancient Greek term, sasbestos, meaning inextinguishable or unquenchable, a characterization of the material’s invincibility from the intense heat of the fire pits used by the Greeks for cooking and warmth.
Asbestos in the Middle Ages and Beyond
Around 755, King Charlemagne of France had a tablecloth made of asbestos to prevent it from burning during the accidental fires that frequently occurred during feasts and celebrations. Like the ancient Greeks, he also wrapped the bodies of his dead generals in asbestos shrouds. By the end of the first millennium, cremation cloths, mats and wicks for temple lamps were fashioned from chrysotile asbestos from Cyprus and tremolite asbestos from northern Italy.
In 1095, the French, German and Italian knights who fought in the First Crusade used a catapult, called a trebuchet, to fling flaming bags of pitch and tar wrapped in asbestos bags over city walls during their sieges. In 1280, Marco Polo wrote about clothing made by the Mongolians from a “fabric which would not burn.” Polo visited an asbestos mine in China to disprove the myth that asbestos came from the hair of a wooly lizard.
Chrysotile asbestos was mined during the reign of Peter the Great, Russia’s tsar from 1682 to 1725. A purse made of fireproof asbestos, now part of London’s Natural History Museum collection, was brought to England by Benjamin Franklin during his first visit there as a young man in 1725. Paper made from asbestos was discovered in Italy in the early 1700s. By the 1800s, the Italian government was utilizing asbestos fibers in its bank notes. The Parisian Fire Brigade in the mid-1850s wore jackets and helmets made from asbestos.
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¿Qué aspecto tiene?
Solo verá masilla de asbesto negra después de que se haya eliminado una cubierta de piso.
Como su nombre indica, el negro es su color predominante. Pero puede haber rastros de otros colores: subsuelo que se ve a través o partes del revestimiento del piso que no se eliminaron por completo.
Se colocará plano contra el subsuelo, sin crestas, protuberancias o lagunas de importancia, con remolinos incrustados débiles desde su aplicación inicial.
Ninguna fibra de amianto será visible a simple vista.
Si tuviera que lijar enérgicamente (no se recomienda), se volvería espeso y parecido al alquitrán del calor.
Commercialization of Asbestos
Asbestos manufacturing was not a flourishing industry until the late 1800s, when the start of the Industrial Revolution helped sustain strong and steady growth of the industry. That’s when the practical and commercial uses of asbestos, with its myriad applications, became widespread. As the mining and manufacturing of asbestos exploded, so did its dangerous health effects on those who mined and refined the mineral, as well as those who worked with it.
Asbestos’ resistance to chemicals, heat, water and electricity made it an excellent insulator for the steam engines, turbines, boilers, ovens and electrical generators that powered the Industrial Revolution. The malleable properties of asbestos made it an important building, binding and strengthening commodity.
Peterson Firm LLP, una firma de abogados de Washington DC que se ocupa de casos de mesotelioma, observa que las siguientes compañías fabricaron adhesivos que contienen asbesto:
3M (Minnesota Mining and Manufacturing Company)
- American Biltrite
- Amtico Floors
- A. P. Green Industries
- Armstrong World Industries
- Asbestos Corporation, Ltd.
- Celotex Corporation
- Crown Cork and Seal
- Congoleum Corporation
- GAF Corporation
- Garlock Packing Company
- Johns Manville
- Mobile Oil Corporation
- National Gypsum Company
- A continuación se enumeran las marcas más destacadas de adhesivo para piso con asbesto fabricado por estas compañías.En algunos casos, puede encontrar viejas latas de adhesivo dejadas por dueños anteriores en sótanos o talleres.
Adhesivo Armstrong S-89
- Adhesivo Armstrong S-90
- Cemento Stove & Furnace Atlas
- Adhesivo fibroso Carey
- Adhesivos fibrosos Empire Ace
- Adhesivo fibroso JM Cemento
- Cemento Crown Coat
- Adhesivo de laminado Gold Bond
- ¿Es seguro?
Asbestos Mining Around the Globe
In the early part of the 19th century, crocidolite (blue asbestos) had already been found in Free State, Africa. In 1876, chrysotile (white asbestos) was discovered in the Thetford Township, in southeastern Quebec. Shortly afterward, Canadians established the world’s first commercial asbestos mines. They joined Russia in excavating the soft, fibrous form of the mineral, which is found in more than 95 percent of all asbestos products.
The early 1870s also saw the founding of large asbestos industries in Scotland, Germany and England. Italy had been mining tremolite asbestos for decades. Australians began mining asbestos in Jones Creek, New South Wales, in the 1880s. By the early 1900s, anthophyllite asbestos was mined in Finland. Amosite (brown asbestos) was discovered in Transvaal, South Africa. Chrysotile from the mines of Swaziland and Zimbabwe was mined and marketed around the world.
While the remarkable physical properties of asbestos were known even to the ancient and medieval worlds, it was the coming of the Industrial Revolution, during the latter part of the 19th century, that elevated asbestos mining and manufacturing into a thriving and lucrative intercontinental enterprise.
Asbestos Production Increases
Before the late 1800s, asbestos mining was not mechanized. The heavy work of chipping away rock and extracting the asbestos for further processing was performed manually. Horses and drays were utilized for transporting the mined product. But once the commercial applications for asbestos were realized and demand grew, asbestos mining became industrialized. Its manpower multiplied by steam-driven machinery and new mining methods.
By the early 1900s, asbestos production had grown worldwide to more than 30,000 tons annually. Children and women were added to the asbestos industry workforce, preparing, carding and spinning the raw fibers, while men toiled in the mines.
The uses of asbestos expanded just as rapidly as its manufacture. Henry Ward Johns in 1858 founded the H.W. Johns Manufacturing Company in lower Manhattan when he was 21. He sold new, fireproof roofing material made of burlap, asbestos, tar and other ingredients. The anthophyllite asbestos he used came from a quarry in nearby Staten Island. For the next 40 years, before he died from “dust phthisis pneumonitis,” believed to be asbestosis, Johns greatly expanded the number of asbestos applications. His firm merged with the Manville Covering Company in 1901. Johns Manville became the largest manufacturing enterprise that used asbestos in the U.S.
In 1896, the first asbestos brake linings for new horseless carriages were made by Ferodo, a British company. Three years later, in Germany, the first patent was issued for the manufacture of asbestos cement sheets. High-pressure asbestos gaskets were turned out in 1900 by Klinger in Austria. The first asbestos pipes were developed in Italy in 1913.
Mining in the U.S. spiked in the 1960s and 1970s, with dozens of operations on the East Coast and in California. The King City Asbestos Company (KCAC) mine in west-central California was the last active asbestos mine in the U.S., closing in 2002.
En cuanto a otras partes de su casa que podrían contener asbesto, es posible que desee verificar si el aislamiento del ático contiene asbesto
Las tuberías suelen estar envueltas en amianto. Sin embargo, debes preocuparte por las tuberías expuestas debajo de los fregaderos. Las tuberías expuestas en los espacios bajos y los sótanos deberían ser su principal preocupación.
Documenting the Hazardous Effects of Asbestos
As early as 1897, an Austrian doctor attributed pulmonary troubles in one of his patients to the inhalation of asbestos dust. An 1898 report regarding the asbestos manufacturing process in England, where factories had been routinely inspected since 1833 to protect the health and safety of workers, cited “widespread damage and injury of the lungs, due to the dusty surrounding of the asbestos mill.”
In 1906, the first documented death of an asbestos worker from pulmonary failure was recorded by Dr. Montague Murray at London’s Charring Cross Hospital. The autopsy of the 33-year-old victim revealed large amounts of asbestos fibers in his lungs. Reports of worker deaths from “fibrosis” in asbestos plants in Italy and France echoed studies in the U.S. that suggested that asbestos workers were dying unnaturally young. And as early as 1908, insurance companies in the U.S. and Canada began decreasing coverage and benefits, while increasing premiums, for workers employed in the asbestos industry.
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Asbestos Industry: Once an Unstoppable Engine
Despite consistent health warnings, asbestos mining and manufacturing was an engine that could not be stopped. In 1910, world production exceeded 109,000 metric tons, more than three times the total in 1900.
In the United States, increased consumption stemmed from the population’s growing demand for cost-effective, mass-produced construction materials. Asbestos products filled that need. The U.S. quickly became the world leader in asbestos usage, with neighboring Canada furnishing a steady supply. In fact, the onset of World War I, followed by the Great Depression, temporarily slowed the asbestos industry’s exponential growth. The start of World War II revived that growth.
While mining and manufacturing during WWII actually declined in many asbestos-producing countries, Canada, South Africa and the U.S. were able to supply much of America’s increasing wartime need of the minerals. U.S. asbestos consumption by 1942 had increased to about 60 percent of world production, up from 37 percent in 1937. Heavy use of asbestos by the U.S. military eventually led to high rates of mesothelioma in veterans.
Asbestos in Common Products
Several factors contributed to a rise in the production and consumption of asbestos products, especially in the United States. A brisk rise in the domestic construction industry increased demand for a growing number of asbestos-based products.
As cars became a common element of the American landscape, so did new more durable roads. Some of the roads built in the U.S. between the 1930s and 1950s contained asbestos-laced asphalt.
Other products that contained asbestos:
- Asbestos cement
- Asbestos insulation for electric wiring
- Asbestos roofing and flooring compounds
- Thermal insulation for homes and offices
- Automotive and airplane clutches
- Asbestos millboard and paper for electrical panels
- Heat and acid-resistant gaskets and packing materials
- Fillers and reinforcement for plasters, caulking compounds and paints
- Spray-on, fire-retardant coating for steel girders in buildings
- Car, truck and airplane brake pads and linings, seals and gaskets
Modern Demand for Asbestos
Global demand for asbestos increased after the war as economies and countries struggled to rebuild. U.S. consumption also grew in the post-war years because of a massive expansion of the American economy as well as sustained construction of military hardware during the Cold War.
U.S. consumption of asbestos peaked in 1973 at 804,000 tons. Peak world demand for asbestos was realized around 1977. Some 25 countries were producing almost 4.8 million metric tons per year, and 85 countries were producing thousands of asbestos products.
But by the late 1970s, a dramatic decline began in the use of asbestos throughout the industrialized nations. The public was beginning to understand the connection between asbestos exposure and debilitating lung diseases.
Organized labor and trade unions were demanding safer and healthier working conditions, and liability claims against major asbestos manufacturers caused many of them to make and market asbestos substitutes.
By 2003, new environmental regulations and consumer demand helped push for full or partial bans on the use of asbestos in 17 countries:
- Saudi Arabia
- United Kingdom
In 2005, asbestos was banned throughout the European Union. In recent years, many of the world’s emerging economies have embraced the use of asbestos as eagerly as more developed nations did for much of the last century.
Still No Asbestos Ban in the US
Although medical evidence in the 1930s linked asbestos exposure to mesothelioma, the federal government didn’t pass legislation limiting exposure until the 1970s. More guidelines were issued the following decade.
Asbestos is still not banned in the United States. A 1989 ruling issued by the Environmental Protection Agency banning most asbestos-containing products was overturned by the Fifth Circuit Court of Appeals in New Orleans in 1991 under pressure from the asbestos industry. Although it is still a legal commodity that appears in many building and common household products, asbestos use has declined considerably in the U.S.
The last U.S. asbestos mine closed in 2002, ending more than a century of the country’s asbestos production. And although the United States has always been a major importer of asbestos, historically providing only a small percentage of the world’s supply, it was always the world’s largest consumer.
Several bills in Congress have sought to create the first national mesothelioma registry as well as renewed interest in banning asbestos. However, in June 2018, the EPA announced that it would consider new uses of asbestos.
4 Cited Article Sources
- USGS. (2006). Worldwide asbestos supply and consumption trends from 1900 through 2003.
Retrieved from: https://pubs.usgs.gov/circ/2006/1298/c1298.pdf
- Webster, P. (2006). White Dust Black Death: The Tragedy of Asbestos Mining at Baryulgil. Trafford Publishing.
- Boslaugh, S. (2008). Encyclopedia of Epidemiology. Sage Publications, Inc.
- Schneider, A., & McCumbe, D. (2004). An Air That Kills. G.P. Putnam’s Sons: New York.
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Last Modified August 8, 2019
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