Presntation on Asbestos fiber textile raw materials

ASBESTOS FIBER

ASBESTOS FIBERPresentation OnBISMILLAHIR RAHMANIR RAHIM

WHAT IS ASBESTOSAsbestos includes chrysotile, amosite, crocidolite, tremolite asbestos, anthophyllite asbestos, actinolite asbestos,and any of these materials that have been chemically treated

a fabric woven from asbestos fibers, formerly used for theater curtains, firefighters' gloves, etc

WHAT IS ASBESTOSAsbestos is naturally found with a set of Six Silicate minerals which has some characteristics for using in commercial sight Its used in certain products, such as building materials and vehicle brakes, to resist heat and corrosion

HISTORYThe first recorded use of the word asbestos is by Pliny the Elder in the 1st century ad, although the substance itself was known as early as the2nd century bc. The Romans made cremation cloths and wicks from it, and centuries later Marco Polo noted its usefulness as cloth. Asbestos se in human culture dates back at least 4,500 years, when evidence shows that inhabitants of the Lake Juojrvi region in East Finland strengthened earthenware pots and cooking utensils with the asbestos mineral anthophyllite.

HISTORYThe word asbestos comes from the ancient Greek ( meaning "unquenchable" or "inextinguishable.One of the first descriptions of a material that may have been asbestos is in Theophrastus, On Stones, from around 300 BC, although this identification has been questioned

Source of ASBESTOS

Asbestos is not made, it is mined. Different colors of asbestos can be found in mines all across the world. White asbestos, called chrysotile, comes from mines in Europe and United States. Brown asbestos, amosite, is commonly found in African mines. Blue asbestos, crocidolite, is found in South Africa and Australia. Because of this mineral's abundance and the low cost of obtaining it, no attempt to artificially synthesize it has ever been made

Something AboutASBESTOS

Manufacturing Process of AsbestosAsbestos is obtainable by various underground mining methods, but the most common method is open-pit mining. Only about 6 percent of the mined ore contains usable fibers

The fibers are separated from the ore by crushing, air suction, and vibrating screens, and in the process are sorted into different lengths, or grades.

The most widely used method of grading, the Qubec Standard Test Method, divides the fibers into seven groups, the longest in group one and the shortest, called milled asbestos, in group seven. The length of the fibers, as well as the chemical composition of the ore, determines the kind of product that can be made from the asbestos. The longer fibers have been used in fabrics, commonly with cotton or rayon, and the shorter ones for molded goods, such as pipes and gaskets

Producing Nations

TYPES OF ASBESTOS

Chrysotile Amosite Crocidolite Tremolite Anthophyllite

ChrysotileThis is the most commonly used form of asbestos and canbe found today in roofs, ceilingswalls and floors of homes and businesses. Chrysotile asbestos also was used in automobile brake linings, pipe insulation, gaskets and boiler seals. Although it is more prevalent, some studies show it takes more exposure to chrysotile than other types of asbestos to develop related diseases

AmositeThis is known as brown asbestos, and it originatesmostly in Africa. It was used most frequently in cement sheet and pipe insulation. It can be found in insulating board (which contained up to 40 percent asbestos), ceiling tiles and in thermal insulation products. Like the other forms of amphibole asbestos, it has needle-like fibers

CrocidoliteThis is blue asbestos and its knownfor having the best heat resistance.Mined mostly in South Africa, Bolivia and Australia, this is seenas the most dangerous type of asbestos.Crocidolite was commonly used to insulate steam engines, and it was found in some spray-on coatings, pipe insulation and cement products

TremoliteThis is not used commercially, but it can be found as a contaminant inchrysotile asbestos, vermiculite and talc powders. It was occasionally found as a contaminant in certain asbestos-containing insulation products, paints, sealants and roofingmaterials. Tremolite can be white, green, gray and even transparent

AnthophylliteThis type was mined primarilyin Finland and displays a gray-brown color. It was not commercially used and was rather found as a contaminant.Anthophyllite was most commonly found in composite flooring

Physical PropertiesAsbestos- the combined determination of naturally occurring fibrous silicate minerals that exist in the form of bundles of fibers. The length of the fiber bundles can be up to severalcentimeters. The fiber diameter may be varied, butgenerally no greater than millimeter size. Theyare resilient, physical and chemical stability,high tensile strength.

Physical PropertiesStability of Asbestos in the environment and its biological behavior in governed by such of its properties:

Fiber length and DiameterSurface areChemical natureProperties of surfaceStability of the mineral in the biological environment

Physical PropertiesFibrous forms and non-fibrous forms of a mineral may occur in the same deposits. That would make sense when one considers how asbestos is formed. It would seem very likely that temperature and pressure might be sufficient to metamorphose completely some but not all of the igneous rock into the asbestos formtwo distinct groups: chrysotile (from the Serpentine group); and amosite, crocidolite, tremolite, actinolite and anthophyllite (from the Amphibole group). OSHA defines an asbestos fiber as having a length > 5mm and a length:width ratio of 3:1. EPA, on the other hand, defines a particle as a fiber if the ratio is 5:1 length:width when analyzing bulk samples.

Physical PropertiesAsbestos is represented as two main groups minerals and serpentine amfibol differing in type crystal structure.

When processing the fiber bundlesCan be torn into smaller pieces, some Of which have a size lessthan a micron

FIBER BUNDLES

Asbestos fibers are insoluble in water and organic solvents and are nonflammable. While the serpentine chrysotile is soluble in acid, the amphiboles amosite, crocidolite and anthophyllite are resistant to acids. Interestingly enough, most asbestos minerals have non-asbestos counterparts with identical chemical compositions. In the case of tremolite and anthophyllite, the word "asbestos" is added after the mineral name to distinguish it from the non-asbestos formChemical Properties

Chemical PropertiesAsbestos fibers have no detectible odor or taste. They are all solids that do not move through soil and are insoluble in water. Its color will vary according to type, and metallic composition. Crocidolite, which has iron and sodium as its only metallic elements, is the most colorful, adorned in a range of colors including shades of lavender, blue and green. In general, asbestos-containing iron may display a green color ranging from a hint of green to solid green depending upon the amount of iron present

Chemical PropertiesTremolite contains no iron, but is part of a continuous mineral series with actinolite, in which iron and magnesium can freely substitute with each other. As a result, some specimens of tremolite may show a hint of pale green. Chrysotile and tremolite, which in pure form contain no iron, tend to be white, together with actinolite and anthophyllite are grouped together as "white asbestos" and classified as UN2590 (under the United Nations chemical ID numbering system).

It is vital to ensure that students do not come in contact with asbestos as it can cause a range of deadly illnesses including lung cancerAccording to the World Health Organization, such asbestos-related diseases kill 107,000 people each year around the world

DISADVANTAGE OF ASBESTOS

Asbestos fibers is just not any hazard though it is really in fantastic issue, but when asbestos fiber becomes crumbly combined with okay dust-like fibers become air-borne, theyre going to result in significant well-being results, 15-40 many years along the monitor

Asbestosis is caused by skin damage with the lung area, due to asbestos fibers materials lodging right now there. Exposure to asbestos may also result in mesothelioma, the unusual cancer with the upper body, heart as well as stomach coatingDISADVANTAGES OF ASBESTOS

USES OF ASBESTOS FIBERAsbestos is a nonmetallic mineral fiber, which is nonflammable. The fiber is woven into fabrics and used for theater curtains and industrial uses where flame-resistant materials are needed. The fibrous form of several minerals and hydrous silicates of magnesium. The name may also be applied to the fibrous forms of calcium and iron. Asbestos fibers can be molded or woven into various fabrics. Because it is nonflammable and a poor heat conductor, asbestos has been widely used to make fireproof products such as safety clothing for fire fighters and insulation products such as hot-water pipin

USES OF ASBESTOS FIBER

Fire-resistant and non-asbestos fiber cement boards

Asbestos Fiber Cloth

Asbestos fiber wire

Duct Asbestos insulation: asbestos paper

Abestos yarn is made of white, clean chrysotile Twisted Asbestos Fiber

Asbestos gloves were often used for industrial purposes to protect the hands

Dust-Free-Asbestos-Cloth-mainUSES OF ASBESTOS FIBER

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