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UER Forum > Archived UE Tutorials, Lessons, and Useful Info > WTF is asbestos? (Viewed 648 times) Ethan Thomas  Location: Federal Way, WA Gender: Male  |  |  WTF is asbestos? < on 6/4/2008 4:14 AM >   asbestos: Asbestos is a group of minerals with long, thin fibrous crystals. The word "asbestos" is derived from a Greek adjective meaning inextinguishable. The Greeks termed asbestos the "miracle mineral" because of its soft and pliant properties, as well as its ability to withstand heat. Asbestos became increasingly popular among manufacturers and builders in the late 19th century due to its resistance to heat, electricity and chemical damage, its sound absorption and tensile strength. When asbestos is used for its resistance to fire or heat, the fibers are often mixed with cement or woven into fabric or mats. Asbestos is used in brake shoes and gaskets for its heat resistance, and in the past was used on electric oven and hotplate wiring for its electrical insulation at elevated temperature, and in buildings for its flame-retardant and insulating properties, tensile strength, flexibility, and resistance to chemicals. Unfortunately, this "miracle material" is now known to be highly toxic. The inhalation of asbestos fibers can cause serious illnesses, including mesothelioma and asbestosis. Since the mid 1980s, many uses of asbestos have been banned in many countries. Serpentine minerals have a sheet or layered structure. Chrysolite is the only asbestos mineral in the serpentine group. In the United States, chrysotile has been the most commonly used type of asbestos. According to the U.S. EPA Asbestos Building Inspectors Manual, chrysotile accounts for approximately 95% of asbestos found in buildings in the United States. Chrysotile is often present in a wide variety of materials, including: joint compound mud and texture coats vinyl floor tiles, sheeting, adhesives roofing tars, felts, siding, and shingles "transite" panels, siding, countertops, and pipes fireproofing caulk gaskets brake pads and shoes clutch plates stage curtains fire blankets interior fire doors fireproof clothing for firefighters thermal pipe insulation In the European Union and Australia it has recently been banned as a potential health hazard[19] and is not used at all. Japan is moving in the same direction, but more slowly. Revelations that hundreds of workers had died in Japan over the previous few decades from diseases related to asbestos sparked a scandal in mid-2005.[20] Tokyo had, in 1971, ordered companies handling asbestos to install ventilators and check health on a regular basis; however, the Japanese government did not ban crocidolite and amosite until 1995, and a full-fledged ban on asbestos was implemented in October 2004.[20] Amphibole group Five types of asbestos are found in the amphibole group: amosite, crocidolite, anthophyllite, tremolite, and actinolite. Amosite, the second most likely type to be found in buildings, according to the U.S. EPA Asestos Building Inspectors Guide, is the "brown" asbestos. Amosite and crocidolite were formerly used in many products until the early 1980s. The use of all types of asbestos in the amphibole group was banned (in much of the Western world) by the mid-1980s, and by Japan in 1995. These products were mainly: Low density insulation board and ceiling tiles Asbestos-cement sheets and pipes for construction, casing for water and electrical/telecommunication services Thermal and chemical insulation (i.e., fire rated doors, limpet spray, lagging and gaskets) Health issues Chrysotile asbestos, like all other forms of industrial asbestos, has produced tumors in animals. Mesotheliomas have been observed in people who were occupationally exposed to chrysotile, family members of the occupationally exposed, and residents who lived close to asbestos factories and mines.[1] Brown asbestos, like all asbestos, is hazardous. Blue asbestos is commonly thought of as the most dangerous type of asbestos. Tremolite often contaminates chrysotile asbestos, thus creating an additional hazard. Asbestos exposure becomes a health concern when high concentrations of asbestos fibers are inhaled over a long time period.[1] People who become ill from asbestos are almost always those who are exposed on a day-to-day basis in a job where they work directly with the material. As a person's exposure to fibers increases, either by breathing more fibers or by breathing fibers for a longer time, that person's risk of disease also increases. Disease is very unlikely to result from a single, high-level exposure, or from a short period of exposure to lower levels.[2] [edit] Other asbestos-related diseases Asbestos warts – caused when the sharp fibers lodge in the skin and are overgrown causing benign callus-like growths. Pleural plaques – discrete fibrous or partially calcified thickened area which can be seen on X-rays of individuals exposed to asbestos. They do not become malignant or cause other lung impairment. Diffuse pleural thickening – similar to above and can sometimes be associated with asbestosis. Usually no symptoms shown but if extensive can cause lung impairment. [edit] Asbestos as a contaminant Asbestos fibres (SEM picture)Most respirable asbestos fibers are invisible to the unaided human eye because their size is about 3.0-20.0 µm in length and can be as thin as 0.01 µm. Human hair ranges in size from 17 to 181 µm in width.[21] Fibers ultimately form because when these minerals originally cooled and crystallized, they formed by the polymeric molecules lining up parallel with each other and forming oriented crystal lattices. These crystals thus have three cleavage planes, just as other minerals and gemstones have. But in their case, there are two cleavage planes that are much weaker than the third direction. When sufficient force is applied, they tend to break along their weakest directions, resulting in a linear fragmentation pattern and hence a fibrous form. This fracture process can keep occurring and one larger asbestos fiber can ultimately become the source of hundreds of much thinner and smaller fibers. As asbestos fibers get smaller and lighter, they more easily become airborne and human respiratory exposures can result. Fibers will eventually settle but may be re-suspended by air currents or other movement. Friability of a product containing asbestos means that it is so soft and weak in structure that it can be broken with simple finger crushing pressure. Friable materials are of the most initial concern due to their ease of damage. The forces or conditions of usage that come into intimate contact with most non-friable materials containing asbestos are substantially higher than finger pressure. Environmental asbestos Asbestos can be found naturally in the air outdoors and in some drinkable water, including water from natural sources.[22] Studies have shown that members of general (non-occupationally exposed) population have tens of thousands to hundreds of thousands of asbestos fibers in each gram of dry lung tissue, which translates into millions of fibers and tens of thousands of asbestos bodies in every person's lungs.[23] Asbestos from natural geologic deposits is known as "Naturally Occurring Asbestos" (NOA). Health risks associated with exposure to NOA are not yet fully understood, and current US federal regulations do not address exposure from NOA. Many populated areas are in proximity to shallow, natural deposits which occur in 50 of 58 California counties and in 19 other U.S. states. In one study, data was collected from 3,000 mesothelioma patients in California and 890 men with prostate cancer, a malignancy not known to be related to asbestos. The study found a correlation between the incidence of mesotheliomas and the distance a patient lived from known deposits of rock likely to include asbestos, the correlation was not present when the incidence of prostate cancer was compared with the same distances. According to the study, risk of mesothelioma declined by 6 percent for every 10 kilometers that an individual had lived from a likely asbestos source.[24] Portions of El Dorado County, California are known to contain natural asbestos formations near the surface.[25][24] The USGS studied amphiboles in rock and soil in the area in response to an EPA sampling study and subsequent criticism of the EPA study. The study found that many amphibole particles in the area meet the counting rule criteria used by the EPA for chemical and morphological limits, but do not meet morphological requirements for commercial-grade-asbestos. The executive summary pointed out that even particles that do not meet requirements for commercial-grade-asbestos may be a health threat and suggested a collaborative research effort to assess health risks associated with "Naturally Occurring Asbestos".[26] Large portions of Fairfax County, Virginia were also found to be underlain with tremolite. The county monitored air quality at construction sites, controlled soil taken from affected areas, and required freshly developed sites to lay 6 inches (150 mm) of clean, stable material over the ground.[24] "What is the difference between a man and a parasite? A man builds, a parasite asks 'Where's my share?' A man creates, a parasite says 'What will the neighbors think?' A man invents, a parasite says 'Watch out, or you might tread on the toes of God...'" tholcomb  Location: Chattanooga, TN Gender: Male Captain Baghead!  |  Re: WTF is asbestos? <Reply # 1 on 6/4/2008 4:53 AM >   smells like wikipedia telefontubbie  Location: Latvia, Riga Gender: Female "No Trespassing" - It's an invitation!  |  Re: WTF is asbestos? <Reply # 2 on 6/4/2008 5:12 AM >   Thanks because I'm too lazy to read wikipedia! Now I know that dust from asbestos and slate are dangerous so I'm considering now to buy a respirator. lanceeman  Location: richland(aka noob land) washington Gender: Male sleep?....nah.  |  Re: WTF is asbestos? <Reply # 3 on 6/4/2008 8:50 AM >   Even though this same thing was posted with in the last month(i think, i may have been poking around in the archives). It still nice to have up here to keep the(help asbestos!, whats asbestos?, is this asbestos?, do i have asbestos on me?, OMG I ATE SOME ASBESTOS!!!) posts down to a bearable level. lol your the one who choose to jack off to this old house with your tears as lube - Savannah willskith  Location: Boston, MA Gender: Male  |  |  |  Re: WTF is asbestos? <Reply # 4 on 6/4/2008 3:46 PM >   There are about 10 posts on this already. It says in really big letters "Read before posting" for a reason http://www.uer.ca/...d=1&threadid=30971 grit your teeth in the face of fear. self repression is the true sign of a coward, toss your inhibitions to the wind. SaraBellum  Berkshire Hunt Location: Villa Villekulla Gender: Female Coming to a cinema near you this summer.  |  |  Re: WTF is asbestos? <Reply # 5 on 6/5/2008 6:29 AM >   Damn, if only UER had a search feature. Oh, wait! [01:47:56] <GreyDeath> Sara just stares her enemies into submission and eventually madness "You can either be wise or a bad-ass gangsta, but not both. You must choose your path." ~~metawaffle UER Forum > Archived UE Tutorials, Lessons, and Useful Info > WTF is asbestos? (Viewed 648 times) All content and images copyright © 2002-2024 UER.CA and respective creators. Graphical Design by Crossfire. To contact webmaster, or click to email with problems or other questions about this site: UER CONTACT View Terms of Service | View Privacy Policy | Server colocation provided by Beanfield This page was generated for you in 78 milliseconds. Since June 23, 2002, a total of 741401397 pages have been generated.