www.mesotheliomagoogle.com

Asbestos Data

Asbestos is a natural occurring mineral with thermal and chemical resistance, flexibility, and high tensile strength qualities. Known as the "magic mineral", this fiberous material has been used as a thermal insulation material for decades.Due to its remarkable resistance to chemicals and heat, this material found widespread use in fireproof clothing, insulation and other industrial applications. However, even though the pulmonary disease resulting from asbestos inhalation was made aware to the public at the turn of the twentieth century this disease was not taking seriously until the 1920’s when major efforts were mounted to control it.

What is Asbestos?

The term asbestos comes from the Greek word for “inextinguishable” or “indestructible.” Asbestos is a fibrous mineral with thermal and chemical resistance, flexibility, and high tensile strength properties. Although its use has been reduced since the 1970's, today asbestos is still present in many common household items and old buildings.

The first use of asbestos dates back to 2500 B.C., when it was used as a wick material for oil lamps and also in pottery making. Asbestos was also used in cloths for retaining the ashes of the dead during cremation. Mats were also made from asbestos by both the Chinese and Egyptians. Combining asbestos with clay and other materials was also one of its earlier applications.

Asbestos is classified into many different types, which include; chrysotile (white asbestos), crocidolite (blue asbestos), amosite (brown asbestos), tremolite, anthopyllite, and actinolite.

However, only chrysolite is the most widely used asbestos type in the United States. Other asbestos types used commercially are crocidolite and amosite, but in a limited capacity. Tremolite, anthopyllite, and actinolite are the most abundant, but they have been used primarily as contaminants of other minerals, such as chrysotile, verniculite, and talc.

Since its discovery, asbestos has found widespread use in part due to its unmatched engineering and commercial performance. Due to its thermal resistant qualities, asbestos has been used as a frictional material in break pads. It has also been used in specialized products such as gaskets, pads, fabric sheets, and asbestos paper due to the length and pliability of its fibers. Mixed into a slurry, asbestos has been applied to building surfaces for fire protection and heat retention, such as in furnaces and kilns. As a fortifying additive, which is it's major present day use, asbestos is a component of cement, concrete, paint, vinyl, and tar mixtures, accounting for 70% of current applications worldwide.

Diseases Associated with Asbestos

Asbestos is a cancerous material, and exposure to it may result in later development of diseases such as benign pleural effusion, pleural plaques, diffuse pleural thickening, rounded atelectasis, asbestosis, mesothelioma, and lung cancer. Most exposure to asbestos has occurred occupationally. However, people have also been exposed to asbestos through common household products, old buildings, and by indirect contact from loved ones who have work with asbestos directly and have carried home asbestos dust on their clothing.

Although the manufacturing of asbestos products has been greatly reduced in the United States due to increasing governmental regulations since the late 1970's, asbestos still remains present today in old structures, buildings, and even warships that were built before this time. For this reason and due to the long latency period between the initial symptoms of the disease and diagnosis, asbestos-related disease still remains a serious public health hazard.

Asbestosis

Asbestosis is one of many diseases categorized as an “environmental lung disease” or “occupational lung disease”. It is a lung condition referred to as diffuse pulmonary fibrosis. Asbestosis results from coming in contact with asbestos and inhaling its deadly fibers into your lungs. These asbestos fibers, once inhaled, accumulate in the lung tissue, thus distinguishing it from other fibrotic diseases. Additionally, asbestos fibers have been found in small numbers beyond the lungs; such as the tonsils, thoracic and abdominal lymph nodes, pleura, peritoneum, pancreas, spleen, kidneys, liver, stomach, esophagus, small and large intestines. This disease is progressive and irreversible in nature and typically leads to subsequent respiratory disability. In most severe cases, asbestosis may even lead to death from pulmonary hypertension and cardiac failure.

Any accumulation of dust in the lungs, whether is asbestos or not, is referred to as “pneumoconiosis”. Pneumoconiosis also refers to the pathologic response of the human body to the presence of the accumulated dust in the lungs, which results in asbestosis. Some of the symptoms of asbestosis are; shortness of breath, dry cough, X-Ray changes, and pulmonary function deficiencies. The latency period for asbestosis is generally several decades and it can occur in individuals exposed to large amounts of any of the three commercial forms of asbestos (chrysotile, amosite, or crocidolite) for extended periods of time. This disease may also develop even if the exposure was as brief as three years or less, if the level of exposure was heavy. There are also two other types of asbestos, which are non-commercial, and they are amphibole and anthophyllite.

Mesothelioma

The term Mesothelioma is used to describe a cancerous tumor that involves the “mosothelial” cells of an organ, usually the lungs, heart or abdominal organs.

Mesothelioma is classified into two types, pleural and peritoneal. Pleural mesothelioma is the most common type and it is a very rare and aggressive form of lung cancer. The “pleura” is a thin membrane found between the lungs and the chest cavity, which serves as a lubricant to prevent the lungs from chafing against the chest walls. Peritoneal mesothelioma, although less common, is more invasive and therefore results in a shorter life expectancy for the patient. Mesotheliomas have also been found in other abdominal organs.

As with other types of cancer, there are benign and malignant mesothelioma. The most common of the two is by far the diffuse malignant pleural mesothelioma. This particular type of tumor is very aggressive and invasive, spreading quickly over the surface of the lungs, abdominal organs or heart. Depending at which stage this disease is detected and the general health and strength of the patient, the life expectancy for the victims is between four and twenty-four months. The average person diagnosed with this aggressive type of tumor survives for between four and twelve months from the onset of symptoms. These symptoms include cough, shortness of breath, difficulty breathing and sleeping, pain in the chest and abdominal regions, progressive loss of weight and appetite and pleural effusions (fluid in the chest cavity). However, some victims have survived for several years with the proper treatment.

Lung Cancer

Smoking is by far the leading cause of lung cancer. Tobacco smoke causes more than 8 out of 10 cases of lung cancer, according to the American Cancer Society. Tobacco products contain harmful carcinogens (cancer causing agents) that can damage the cells in the lungs. The longer a person has been smoking and the more cigarettes a day smoked, the greater the chances are of contracting lung cancer. Exposure to secondhand tobacco smoke, which is called involuntary or passive smoking, can also increase the risk of developing lung cancer. If a person stops smoking before lung cancer develops, the lung tissue slowly returns to normal.

Even though smoking is mostly responsible for causing lung cancer, it is not the sole cause of it. Asbestos exposure can also cause lung cancer. People who work with asbestos are already in danger of getting lung cancer, and by smoking, the risk is greatly increased. Although the manufacturing of asbestos has slowed down significantly due to government regulations, it is still present in some products and old buildings. However, if left undisturbed, asbestos poses no danger. Asbestos is only dangerous when it has been disturbed and its raw form (fibers) is released into the air and breathed in.

Who is at risk?

Nearly everyone is exposed to asbestos at some time during their life. However, most people do not become ill from their exposure. People who become ill from asbestos are usually those who are exposed to it on a regular basis, most often in a job where they work directly with the material or through substantial environmental contact.

Since the early 1940s, millions of American workers have been exposed to asbestos. Health hazards from asbestos fibers have been recognized in workers exposed in shipbuilding trades, asbestos mining and milling, manufacturing of asbestos textiles and other asbestos products, insulation work in the construction and building trades, brake repair, and a variety of other trades. Demolition workers, drywall removers, and firefighters also may be exposed to asbestos fibers. As a result of Government regulations and improved work practices, today’s workers (those without previous exposure) are likely to face smaller risks than did those exposed in the past.

Although it is known that the risk to workers increases with heavier exposure and longer exposure time, investigators have found asbestos-related diseases in individuals with only brief exposures. Generally, those who develop asbestos-related diseases show no signs of illness for a long time after their first exposure. It can take from 10 to 40 years for symptoms of an asbestos-related condition to appear.

There is some evidence that family members of workers heavily exposed to asbestos face an increased risk of developing mesothelioma. This risk is thought to result from exposure to asbestos fibers brought into the home on the shoes, clothing, skin, and hair of workers. This type of exposure is called paraoccupational exposure. To decrease these exposures, people exposed to asbestos at work are required to shower and change their clothing before leaving the workplace.

How is asbestos used?

Asbestos was mined and used commercially in North America beginning in the late 1800s. Its use increased greatly during World War II. Since then, it has been used in many industries. For example, the building and construction industry has used it for strengthening cement and plastics as well as for insulation, fireproofing, and sound absorption. The shipbuilding industry has used asbestos to insulate boilers, steampipes, and hot water pipes. The automotive industry uses asbestos in vehicle brakeshoes and clutch pads. More than 5,000 products contain or have contained asbestos. Some of them are listed below:

Asbestos cement sheet and pipe products used for water supply and sewage piping, roofing and siding, casings for electrical wires, fire protection material, electrical switchboards and components, and residential and industrial building materials;

Friction products, such as clutch facings, brake linings for automobiles, gaskets, and industrial friction materials;

Products containing asbestos paper, such as table pads and heat-protective mats, heat and electrical wire insulation, industrial filters for beverages, and underlying material for sheet flooring;

Asbestos textile products, such as packing components, roofing materials, and heat- and fire-resistant fabrics (including blankets and curtains); and

Other products, including ceiling and floor tile; gaskets and packings; paints, coatings, and adhesives; caulking and patching tape; artificial ashes and embers for use in gas-fired fireplaces; plastics; vermiculite-containing consumer garden products; and some talc-containing crayons.

In the late 1970s, the U.S. Consumer Product Safety Commission (CPSC) banned the use of asbestos in wallboard patching compounds and gas fireplaces because the asbestos fibers in these products could be released into the environment during use. Additionally, asbestos was voluntarily withdrawn by manufacturers of electric hair dryers. In 1989, the U.S. Environmental Protection Agency (EPA) banned all new uses of asbestos; uses established prior to 1989 are still allowed. The EPA has established regulations that require school systems to inspect for damaged asbestos and to eliminate or reduce the exposure to occupants by removing the asbestos or encasing it. In June 2000, the CPSC concluded that the risk of children’s exposure to asbestos fibers in crayons was extremely low. However, the U.S. manufacturers of these crayons agreed to reformulate their products within a year. In August 2000, the EPA recommended that consumers reduce possible asbestos exposure from vermiculite-containing garden products by limiting the amount of dust produced during use. The EPA suggested that consumers use vermiculite outdoors or in a well-ventilated area; keep vermiculite damp while using it; avoid bringing dust from vermiculite use into the home on clothing; and use premixed potting soil, which is less likely to generate dust.

The regulations described above and other actions, coupled with widespread public concern about the hazards of asbestos, have resulted in a significant annual decline in U.S. use of asbestos: Domestic consumption of asbestos amounted to about 719,000 metric tons in 1973, but it had dropped to about 9,000 metric tons by 2002. Asbestos is currently used most frequently in gaskets and in roofing and friction products.

Products that may contain Asbestos

According to the U. S. Environmental Protection Agency (EPA), some of the asbestos products still manufactured today include friction products, coatings and sealants, gaskets and packing, reinforced plastics, and the production of asbestos raw fibers (milling). Some manufacturers have also used asbestos in the production process of chlorine. Asbestos has also been used in the cement pipe/sheet and textile product industries, but manufacturing of these products has been discontinued.

Today, most asbestos products are used as an ingredient in the making of a final product, such as vinyl-asbestos flooring and friction products, which are purchased mostly by the construction and automobile industries.

Below are some of the products that may contain asbestos.

Occupations that may expose individuals to Asbestos

Asbestos has been used in association with a number of occupations in addition to those above. Anyone involved with the above industries is at a higher risk for developing an asbestos-related disease, including mesothelioma. Exposure may have been direct or indirect, lengthy or brief. The typical exposure period is lengthy, but some persons with short, indirect exposure to asbestos develop mesothelioma. Mesothelioma can also occur from non-occupational exposure, as evidenced by manifestation of the disease in women whose exposure came from washing the clothing of men (father, husband, son) who worked with, or araound, asbestos.

How can workers protect themselves?

Employers are required to follow regulations dealing with asbestos exposure on the job that have been issued by the Occupational Safety and Health Administration (OSHA), the Federal agency responsible for health and safety regulations in maritime, construction, manufacturing, and service workplaces. The Mine Safety and Health Administration (MSHA) enforces regulations related to mine safety. Workers should use all protective equipment provided by their employers and follow recommended work practices and safety procedures. For example, National Institute of Occupational Safety and Health (NIOSH)-approved respirators that fit properly should be worn by workers when required.

Workers who are concerned about asbestos exposure in the workplace should discuss the situation with other employees, their employee health and safety representative, and their employers. If necessary, OSHA can provide more information or make an inspection. Regional offices of OSHA are listed in the “United States Government” section of telephone directories’ blue pages (under “Department of Labor”). Regional offices can also be located at http://www.osha-slc.gov/html/RAmap.html on the Internet, or by contacting OSHA’s national office at:

Who needs to be examined?

Individuals who have been exposed (or suspect they have been exposed) to asbestos fibers on the job or at home via a family contact should inform their physician of their exposure history and any symptoms. Asbestos fibers can be measured in urine, feces, mucus, or material rinsed out of the lungs. A thorough physical examination, including a chest x-ray and lung function tests, may be recommended. It is important to note that chest x-rays cannot detect asbestos fibers in the lungs, but they can help identify any lung changes resulting from asbestos exposure. Interpretation of the chest x-ray may require the help of a specialist who is experienced in reading x-rays for asbestos-related diseases. Other tests also may be necessary.

As noted earlier, the symptoms of asbestos-related diseases may not become apparent for many decades after exposure. If any of the following symptoms develop, a physical examination should be scheduled without delay:

Shortness of breath;

A cough or a change in cough pattern;

Blood in the sputum (fluid) coughed up from the lungs;

Pain in the chest or abdomen;

Difficulty in swallowing or prolonged hoarseness; and/or

Significant weight loss.

Mesothelioma Google 2007