Fluorocarbon fiber

Fluorinated polymers are by nature inert and nontoxic materials. A certain toxicity may however be incorporated from additives added, e.g. perfluorooctanoic acid or traces of monomers. In addition, toxic organo-fluorine compounds may be generated from these polymers by high temperature decomposition.6-64- 16-118 Biological effects of fluorocarbon fibers have been described.119 Toxicities of polychlorotrifluoroethylenc oils (hydraulic fluids) have also been discussed.202... 

Fluorocarbon fibers Horsehair, artificial nylon Linear esters fibers Modacrylic fibers Nylon fibers and bristles Olefin fibers... 

Some polymeric compounds are nonmelting and insoluble and cannot be processed by the primary methods. For these, the emulsion process is applicable. The polymer is ground into finely divided powder, mixed into a solution of another polymer and solution-spun to fibers. The soluble polymer can be removed by a solvent or by burning and the residual fiber collected. Such process is used for making fluorocarbon fibers such as Teflon, which are chemically highly resistant and nonmelting. 

Chemically Resistant Fibers. Fibers with exceUent chemical resistance to corrosive and/or chemical warfare agents or extreme pH conditions (eg, very acidic or very alkaline) were initially used for protective clothing. However, appHcations for filtration of gases and Hquids in numerous industrial faciHties are now the more important. For example, PPS is suitable for use in filter fabrics for coal-fired boilers because of its outstanding chemical and heat resistance to acidic flue gases and its exceUent durabUity under these end use conditions. Many high tenacity fibers are also chemically inert or relatively unaffected under a variety of conditions. Aramids, gel spun polyethylene, polypropylene, fluorocarbon, and carbon fibers meet these criteria and have been used or are being considered for appHcations where chemical resistance is important. 

Most architectural fabrics are usually flexible composites comprised of glass fibers coated with fluorocarbons to resist wind, mechanical forces, and outdoor environmental degradation. The airport terminal in Saudi Arabia, and the roofs for the Hubert Humphrey Dome in Minneapolis and the Tokyo Dome Stadium are a few examples of the successful use of architectural fabrics. 

Honeywell Specialty Materials, a 3.5 billion strategic business group of the Honeywell Corporation, is a global leader in providing customers with high-performance specialty materials, including fluorocarbons, specialty films and additives, advanced fibers and composites, customized research chemicals, and electronic materials and chemicals. Our products can be found in items you use everyday — at work and at home. For additional information, please visit www.honevwell.com/sites/sm. 

United States, See also American entries Army Corps of Engineers Atomic Energy Commission (AEC) Environmental Protection Agency (EPA) Federal entries Food and Drug Administration (FDA) Government entries National entries OSHA ozone exposure limits U.S. entries acrylic fiber consumption in, ll 220t acrylic fiber production in, 11 189 advanced materials research, 1 696 air separation industry in, 17 754 aliphatic fluorocarbon production in,... 

Here is an extremely sensitive method for measuring nitrite (NOj) down to 1 nM in natural waters. The water sample is treated with sulfanilamide and N-( 1 -naphthylethylenediamine) in acid solution to produce a colored product with a molar absorptivity of 4.5 X ItHM" 1 cm- 1 at 540 nm. The colored solution is pumped into a 4.5-meter-long, coiled Teflon tube whose fluorocarbon wall has a refractive index of 1.29. The aqueous solution inside the tube has a refractive index near 1.33. The colored solution is pumped through the coiled tube. An optical fiber delivers white light into one end of the tube, and an optical fiber at the other end leads to a polychromator and detector. 

Chemical Hazards. Chemical manufacturers and employees contend with various hazards inherent in production of even commonplace materials. For example, some catalysts used in the manufacture of polyethylene (see Olefin polymers) ignite when exposed to air or explode if allowed to become too warm the basic ingredient in fluorocarbon polymers, eg, Teflon (see Fluorine compounds, organic), can become violendy self-reactive if overheated or contaminated with caustic substances (45,46) one of the raw materials for the manufacture of acrylic fibers (see Fibers, acrylic) is the highly toxic hydrogen cyanide (see Cyanides). 

Formulated Commercial Products and Byproducts insecticides, pesticides. fungicides, herbicides, solvents, coatings, chlorinated fluorocarbons, petroleum and petrochemical products, plastics, fibers. 

The percentages show the share of each fiber in the specified end use each year. b Includes acrylic, anidex, modacrylic, nylon, olefin, polyester, saran, Spandex, TFE-fluorocarbon and vinyon. 

Fluoropolymer A manufactured fiber containing at least 95% of a long-chain polymer synthesized from aliphatic fluorocarbon monomers. 

Acetal translucent crystalline polymer is one of the stiffest TPs available. It provides excellent hardness and heat resistance, even in the presence of solvents and alkalies. Its low moisture sensitivity and good electrical properties permit direct competition with die-cast metal in a variety of applications. In addition, acetal has extremely high creep resistance and low permeability. Acetal is also available as a copolymer (Hoechst Celanese Corp. s Celcon) for improved processability. The homopolymer (DuPont s Delrin) has a very low coefficient of friction and its resistance to abrasion is second only to nylon 6/6. Acetals are frequently blended with fibers such as glass or fluorocarbon to enhance stiffness and friction properties. Acetal is not particularly weather-resistant, but grades are available with UV stabilizers for improved outdoor performance. Acetal, whether homopolymer or copolymer, is not used to any significant degree in forming structural foams. 

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