Asbestos polymeric material

The name asbestos incorporates a number of inorganic polymers of Si02 in combination with metal oxides. While the carcinogenic properties of these asbestos polymeric materials was unknown, they were widely used for electrical insulation purposes due to their thermal stability. 

MAJOR APPLICATIONS The dopes of PBA can be utilized for the preparation of films, filaments, fibrids, and coatings. Wet-extruded, tough, clear, flexible films can be applied to substrates like glass, ceramics, metals, concrete, and polymeric materials.The high-temperature resistance of the polyaramids make them suitable for asbestos replacement in heat-resistant work wear. The service life is longer for asbestos and the wearing comfort is greater. PBA has been superseded by poly( p-phenylene terephthalamide). ... 

The following polymeric materials have been used as ablative materials for specific applications phenolics, phenyl silanes, nitrile phenolics, nitrile rubber, silicones, epoxy polyamide, and novolac epoxies. Fillers and reinforcements are used in ablative formulations to improve performance and reduce thermal conductivity. Common ablative fillers are glass, siUca, and quartz cloth carbon and graphite cloth microbubbles (phenolic, silica, and glass) and asbestos fiber. 

Chemical Reactivity - Reactivity with Water No reaction Reactivity with Common Materials Can catch fire when in contact with porous materials such as wood, asbestos, cloth, soil, or rusty metals Stability During Transport Stable at ordinary temperatures, however when heated this material can decompose to nitrogen and ammonia gases. The decomposition is not generally hazardous unless it occurs in confined spaces Neutralizing Agents for Acids and Caustics Flush with water and neutralize the resulting solution with calcium hypochlorite Polymerization Not pertinent Inhibitor of Polymerization Not pertinent. 

In most batteries, the separators are either made of nonwoven fabrics or microporous polymeric films. Batteries that operate near ambient temperatures usually use separators fabricated from organic materials such as cellulosic papers, polymers, and other fabrics, as well as inorganic materials such as asbestos, glass wool, and Si02. In alkaline batteries, the separators used are either regenerated cellulose or microporous polymer films. The lithium batteries with organic electrolytes mostly use microporous films. 

Disc, pulp, and sheet filters accomplish extreme clarification. Not infrequently their mission is complete removal of particles above a stipulated cut size, which may be much less than 1 pm. They operate over a particle-size range of four to five orders of magnitude, contrasting with two orders of magnitude for most other filters. It is not surprising, therefore, that they involve a variety of kinds and grades of filter media, often in successive stages. In addition to packs or discs of cellulosic, polymeric, or asbestos fiber, sheets of pulp, paper, asbestos, carded fiber, woven fabrics, and porous cellophane or polymer are employed. Sandwich-pack composites of several materials have been used for viscous-dope filtration. 

CHEMICAL PROPERTIES stable under ordinary conditions of use and storage hazardous polymerization has not been reported a powerful oxidant reacts with water to form chlorine and hydrofluoric acid corrosive attacks quartz if traces of moisture are present decomposes in cold and hot water reacts with organic matter, glass, asbestos, sand, acids, alkalies, halogens, salts chlorofluorocarbons, metal oxides, and many other materials FP (NA) LFL/UFL (NA) AT (NA) HC (NA) HF( 164.5 kJ/mol at 25 C) Hf (7.60 kJ/mol at 196.8K) T,(154.5 C, 310 F). 

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