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Index Polytetrafluoroethylene

Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications. [1]

160 relations: Aerosol, Alkali metal, All-Clad, Aluminium, Aluminium magnesium boride, American Heritage of Invention & Technology, Artery, Avocado oil, Belleville washer, Bicycle chain, Bird, BS 4994, Carbon, Carbon–fluorine bond, Carcinogen, Catheter, Celsius, Chain scission, Chemours, Chlorofluorocarbon, Coating, Cobalt(III) fluoride, Cookware and bakeware, Corporate spin-off, Creep (deformation), Cross-link, Density, Dental restoration, Diamond-like carbon, Dielectric, Dielectric strength, Diffuser (optics), Dobsonian telescope, DuPont, Dust, Dust collection system, Elastomer, Electret, Electrical cable, Electrical connector, Electrical resistivity and conductivity, Electroless nickel plating, Electron-beam processing, Electronegativity, Electrostatics, Emulsion polymerization, End-group, Enriched uranium, Epidemiology, ETFE, ..., Flare (countermeasure), Fluoride, Fluorinated ethylene propylene, Fluorine, Fluoroantimonic acid, Fluorocarbon, Fluoropolymer, Formicarium, Friction, Frying pan, Gear, Gecko, Gel, General Motors, Glass transition, Gore-Tex, Hash oil, Hose, Hospital-acquired infection, Hubert H. Humphrey Metrodome, Hydrofluoric acid, Hydrophobe, Hypercholesterolemia, Illuminance, Influenza-like illness, Infrared, Insulator (electricity), International Journal of Thermophysics, Irradiance, K-25, Kelvin, Lambert's cosine law, London dispersion force, Lubricant, Magnesium, Magnesium/Teflon/Viton, Magnet, Magnetic susceptibility, Maleimide, Manhattan Project, Marion A. Trozzolo, Melting point, Meyer Corporation, Microwave, Microwave popcorn, Minneapolis, Molecular mass, Newell Brands, Non-stick surface, Nylon, Oak Ridge, Tennessee, Organosulfate, Orthotics, Oxidizing agent, Parkersburg, West Virginia, Parts-per notation, Perfluoroalkoxy alkane, Perfluorooctanesulfonic acid, Persulfate, Plain bearing, Polyethylene, Polymer, Polymer adsorption, Polymer fume fever, Polymerization, Polyoxymethylene, Printed circuit board, Propellant, Propellants, Explosives, Pyrotechnics, Pyrolysis, Pyrotechnic composition, Pyrotechnic initiator, Radical (chemistry), Radio frequency, Radiometer, Radiometry, Relative permittivity, Roy J. Plunkett, Safflower, Science History Institute, Slide plate, Smoke point, Solid-propellant rocket, Soot, Stenosis, Sublimation (phase transition), Superacid, Superhydrophobic coating, Surfactant, Swiss Diamond International, Tefal, Tetrafluoroethylene, The New York Times, The Sydney Morning Herald, Thermal diffusivity, Thermal expansion, Thermobaric weapon, Thermoplastic, Thread seal tape, Toxicant, Trabeculectomy, Ulcerative colitis, Ultraviolet, University of California, Berkeley, Uranium hexafluoride, Van der Waals force, Vein, Xenon difluoride, Yield (engineering), Young's modulus. Expand index (110 more) »


An aerosol is a suspension of fine solid particles or liquid droplets, in air or another gas.

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Alkali metal

The alkali metals are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K),The symbols Na and K for sodium and potassium are derived from their Latin names, natrium and kalium; these are still the names for the elements in some languages, such as German and Russian.

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All-Clad Metalcrafters, LLC is a U.S. manufacturer of cookware with headquarters in Canonsburg, Pennsylvania.

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Aluminium or aluminum is a chemical element with symbol Al and atomic number 13.

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Aluminium magnesium boride

Aluminum magnesium boride or BAM is a chemical compound of aluminium, magnesium and boron.

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American Heritage of Invention & Technology

American Heritage of Invention & Technology was a quarterly magazine dedicated to the history of technology.

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An artery (plural arteries) is a blood vessel that takes blood away from the heart to all parts of the body (tissues, lungs, etc).

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Avocado oil

Avocado oil is an edible oil pressed from the fruit of the Persea americana (avocado).

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Belleville washer

A Belleville washer, also known as a coned-disc spring, conical spring washer, disc spring, Belleville spring or cupped spring washer, is a conical shell which can be loaded along its axis either statically or dynamically.

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Bicycle chain

A bicycle chain is a roller chain that transfers power from the pedals to the drive-wheel of a bicycle, thus propelling it.

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Birds, also known as Aves, are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.

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BS 4994

BS4994 (formally: British Standard 4994:1987) is the "specification for the design and construction of vessels and storage tanks in reinforced plastics".

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Carbon (from carbo "coal") is a chemical element with symbol C and atomic number 6.

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Carbon–fluorine bond

The carbon–fluorine bond is a polar covalent bond between carbon and fluorine that is a component of all organofluorine compounds.

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A carcinogen is any substance, radionuclide, or radiation that promotes carcinogenesis, the formation of cancer.

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In medicine, a catheter is a thin tube made from medical grade materials serving a broad range of functions.

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The Celsius scale, previously known as the centigrade scale, is a temperature scale used by the International System of Units (SI).

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Chain scission

Chain scission is a term used in polymer chemistry describing the degradation of a polymer main chain.

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The Chemours Company, commonly referred to as Chemours, is an American chemical company that was founded in July 2015 as a spin-off from DuPont.

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Chlorofluorocarbons (CFCs) are fully halogenated paraffin hydrocarbons that contain only carbon (С), chlorine (Cl), and fluorine (F), produced as volatile derivative of methane, ethane, and propane.

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A coating is a covering that is applied to the surface of an object, usually referred to as the substrate.

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Cobalt(III) fluoride

Cobalt(III) fluoride is the inorganic compound with the formula CoF3.

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Cookware and bakeware

Cookware and bakeware are types of food preparation containers, commonly found in a kitchen.

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Corporate spin-off

A corporate spin-off, also known as a spin-out, or starburst, is a type of corporate action where a company "splits off" a section as a separate business.

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Creep (deformation)

In materials science, creep (sometimes called cold flow) is the tendency of a solid material to move slowly or deform permanently under the influence of mechanical stresses.

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A cross-link is a bond that links one polymer chain to another.

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The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.

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Dental restoration

A dental restoration or dental filling is a treatment to restore the function, integrity, and morphology of missing tooth structure resulting from caries or external trauma as well as to the replacement of such structure supported by dental implants.

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Diamond-like carbon

Diamond-like carbon (DLC) is a class of amorphous carbon material that displays some of the typical properties of diamond.

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A dielectric (or dielectric material) is an electrical insulator that can be polarized by an applied electric field.

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Dielectric strength

In physics, the term dielectric strength has the following meanings.

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Diffuser (optics)

In optics, a diffuser (also called a light diffuser or optical diffuser) is any material that diffuses or scatters light in some manner to transmit soft light.

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Dobsonian telescope

A Dobsonian telescope is an altazimuth-mounted Newtonian telescope design popularized by John Dobson starting in 1965 and credited with vastly increasing the size of telescopes available to amateur astronomers.

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Dust are fine particles of matter.

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Dust collection system

A dust collection system is an air quality improvement system used in industrial, commercial, and home production shops to improve breathable air quality and safety by removing particulate matter from the air and environment.

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An elastomer is a polymer with viscoelasticity (i. e., both viscosity and elasticity) and very weak intermolecular forces, and generally low Young's modulus and high failure strain compared with other materials.

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Electret (formed of electr- from "electricity" and -et from "magnet") is a dielectric material that has a quasi-permanent electric charge or dipole polarisation.

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Electrical cable

An electrical cable is an assembly of one or more wires running side by side or bundled, which is used to carry electric current.

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Electrical connector

An electrical connector, is an electro-mechanical device used to join electrical terminations and create an electrical circuit.

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Electrical resistivity and conductivity

Electrical resistivity (also known as resistivity, specific electrical resistance, or volume resistivity) is a fundamental property that quantifies how strongly a given material opposes the flow of electric current.

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Electroless nickel plating

Electroless nickel plating (EN) is an auto-catalytic chemical technique used to deposit a layer of nickel-phosphorus or nickel-boron alloy on a solid workpiece, such as metal or plastic.

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Electron-beam processing

Electron-beam processing or electron irradiation is a process that involves using beta radiation, usually of high energy, to treat an object for a variety of purposes.

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Electronegativity, symbol ''χ'', is a chemical property that describes the tendency of an atom to attract a shared pair of electrons (or electron density) towards itself.

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Electrostatics is a branch of physics that studies electric charges at rest.

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Emulsion polymerization

Emulsion polymerization is a type of radical polymerization that usually starts with an emulsion incorporating water, monomer, and surfactant.

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End groups are an important aspect of polymer synthesis and characterization.

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Enriched uranium

Enriched uranium is a type of uranium in which the percent composition of uranium-235 has been increased through the process of isotope separation.

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Epidemiology is the study and analysis of the distribution (who, when, and where) and determinants of health and disease conditions in defined populations.

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Ethylene tetrafluoroethylene (ETFE) is a fluorine-based plastic.

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Flare (countermeasure)

A flare or decoy flare is an aerial infrared countermeasure used by a plane or helicopter to counter an infrared homing ("heat-seeking") surface-to-air missile or air-to-air missile.

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Fluorinated ethylene propylene

Fluorinated ethylene propylene or FEP is a copolymer of hexafluoropropylene and tetrafluoroethylene.

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Fluorine is a chemical element with symbol F and atomic number 9.

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Fluoroantimonic acid

Fluoroantimonic acid is an inorganic compound with the chemical formula (also written, 2HF·SbF5, or simply HF-SbF5).

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Fluorocarbons, sometimes referred to as perfluorocarbons or PFCs, are, strictly speaking, organofluorine compounds with the formula CxFy, i.e. they contain only carbon and fluorine, though the terminology is not strictly followed.

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A fluoropolymer is a fluorocarbon-based polymer with multiple carbon–fluorine bonds.

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A formicarium or ant farm is a vivarium which is designed primarily for the study of ant colonies and how ants behave.

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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

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Frying pan

A frying pan, frypan, or skillet is a flat-bottomed pan used for frying, searing, and browning foods.

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A gear or cogwheel is a rotating machine part having cut like teeth, or cogs, which mesh with another toothed part to transmit torque.

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Geckos are lizards belonging to the infraorder Gekkota, found in warm climates throughout the world.

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A gel is a solid jelly-like material that can have properties ranging from soft and weak to hard and tough.

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General Motors

General Motors Company, commonly referred to as General Motors (GM), is an American multinational corporation headquartered in Detroit that designs, manufactures, markets, and distributes vehicles and vehicle parts, and sells financial services.

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Glass transition

The glass–liquid transition, or glass transition, is the gradual and reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials), from a hard and relatively brittle "glassy" state into a viscous or rubbery state as the temperature is increased.

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Gore-Tex is a waterproof, breathable fabric membrane and registered trademark of W. L. Gore and Associates.

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Hash oil

Hash oil is an oleoresin obtained by the extraction of cannabis or hashish.

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A hose is a flexible hollow tube designed to carry fluids from one location to another.

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Hospital-acquired infection

A hospital-acquired infection (HAI), also known as a nosocomial infection, is an infection that is acquired in a hospital or other health care facility.

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Hubert H. Humphrey Metrodome

The Hubert H. Humphrey Metrodome (commonly called the Metrodome) was a domed sports stadium located in downtown Minneapolis, Minnesota.

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Hydrofluoric acid

Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water.

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In chemistry, hydrophobicity is the physical property of a molecule (known as a hydrophobe) that is seemingly repelled from a mass of water.

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Hypercholesterolemia, also called high cholesterol, is the presence of high levels of cholesterol in the blood.

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In photometry, illuminance is the total luminous flux incident on a surface, per unit area.

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Influenza-like illness

Influenza-like illness (ILI), also known as acute respiratory infection (ARI) and flu-like syndrome/symptoms, is a medical diagnosis of possible influenza or other illness causing a set of common symptoms.

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Infrared radiation (IR) is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye (although IR at wavelengths up to 1050 nm from specially pulsed lasers can be seen by humans under certain conditions). It is sometimes called infrared light.

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Insulator (electricity)

An electrical insulator is a material whose internal electric charges do not flow freely; very little electric current will flow through it under the influence of an electric field.

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International Journal of Thermophysics

The International Journal of Thermophysics is a bimonthly peer-reviewed scientific journal published by Springer Science+Business Media.

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In radiometry, irradiance is the radiant flux (power) received by a surface per unit area.

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K-25 was the codename given by the Manhattan Project to the program to produce enriched uranium for atomic bombs using the gaseous diffusion method.

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The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.

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Lambert's cosine law

In optics, Lambert's cosine law says that the radiant intensity or luminous intensity observed from an ideal diffusely reflecting surface or ideal diffuse radiator is directly proportional to the cosine of the angle θ between the direction of the incident light and the surface normal.

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London dispersion force

London dispersion forces (LDF, also known as dispersion forces, London forces, instantaneous dipole–induced dipole forces, or loosely van der Waals forces) are a type of force acting between atoms and molecules.

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A lubricant is a substance, usually organic, introduced to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move.

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Magnesium is a chemical element with symbol Mg and atomic number 12.

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Magnesium/Teflon/Viton (MTV) is a pyrolant.

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A magnet is a material or object that produces a magnetic field.

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Magnetic susceptibility

In electromagnetism, the magnetic susceptibility (Latin: susceptibilis, "receptive"; denoted) is one measure of the magnetic properties of a material.

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Maleimide is a chemical compound with the formula H2C2(CO)2NH (see diagram).

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Manhattan Project

The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons.

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Marion A. Trozzolo

Marion A. Trozzolo (1925 – June 30, 1992) was an innovator, inventor, entrepreneur, and professor of business at Rockhurst University in Kansas City, Missouri.

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Melting point

The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid at atmospheric pressure.

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Meyer Corporation

Meyer Corporation is a cookware distributor based in Vallejo, California, United States, whose parent company is Hong Kong based Meyer Manufacturing Co.

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Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; with frequencies between and.

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Microwave popcorn

Microwave popcorn is a convenience food consisting of unpopped popcorn in an enhanced, sealed paper bag intended to be heated in a microwave oven.

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Minneapolis is the county seat of Hennepin County, and the larger of the Twin Cities, the 16th-largest metropolitan area in the United States.

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Molecular mass

Relative Molecular mass or molecular weight is the mass of a molecule.

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Newell Brands

Newell Brands is an American worldwide marketer of consumer and commercial products with a portfolio of brands including Rubbermaid food storage, home organization and reusable container products; Contigo and Bubba water bottles; Coleman outdoor products; Diamond matches; Sharpie, Expo Markers, PaperMate, Dymo, Elmer's, Krazy Glue, Mr. Sketch, Parker Pens, Uniball, Prismacolor, Rotring, Xacto, Waterman, Berol stationery products; Bicycle and Bee Playing Cards; Aprica, Nuk, Tigex, Babysun, Baby Jogger and Graco children's products; First Alert alarm systems; Calphalon cookware and kitchen electrics; Sunbeam, Rival, Crock-Pot, Holmes, FoodSaver, Oster, Osterizer, Mr. Coffee small kitchen appliances; Yankee Candle candles; Jostens custom memorabilia; and Goody hair care accessories.

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Non-stick surface

A non-stick surface is a surface engineered to reduce the ability of other materials to stick to it.

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Nylon is a generic designation for a family of synthetic polymers, based on aliphatic or semi-aromatic polyamides.

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Oak Ridge, Tennessee

Oak Ridge is a city in Anderson and Roane counties in the eastern part of the U.S. state of Tennessee, about west of Knoxville.

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Organosulfates are a class of organic compounds sharing a common functional group commonly with the structure R-O-SO3−.

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Orthotics (Greek: Ορθός, ortho, "to straighten" or "align") is a specialty within the medical field concerned with the design, manufacture and application of orthoses.

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Oxidizing agent

In chemistry, an oxidizing agent (oxidant, oxidizer) is a substance that has the ability to oxidize other substances — in other words to cause them to lose electrons.

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Parkersburg, West Virginia

Parkersburg is a city in and the county seat of Wood County, West Virginia, United States.

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Parts-per notation

In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction.

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Perfluoroalkoxy alkane

Perfluoroalkoxy alkanes or PFA are fluoropolymers.

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Perfluorooctanesulfonic acid

Perfluorooctanesulfonic acid (conjugate base perfluorooctanesulfonate) (PFOS) is an anthropogenic fluorosurfactant and global pollutant.

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The term persulfate (sometimes known as peroxysulfate) refers to ions or compounds containing the anions or.

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Plain bearing

A plain bearing, or more commonly sliding bearing and slide bearing (in railroading sometimes called a solid bearing or friction bearing), is the simplest type of bearing, comprising just a bearing surface and no rolling elements.

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Polyethylene or polythene (abbreviated PE; IUPAC name polyethene or poly(ethylene)) is the most common plastic.

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A polymer (Greek poly-, "many" + -mer, "part") is a large molecule, or macromolecule, composed of many repeated subunits.

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Polymer adsorption

Adsorption is the adhesion of ions or molecules onto the surface of another phase.

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Polymer fume fever

Polymer fume fever or fluoropolymer fever, also informally called Teflon flu, is an inhalation fever caused by the fumes released when polytetrafluoroethylene (PTFE, known under the trade name Teflon) reaches temperatures of 300 °C (572 °F) to 450 °C (842 °F).

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In polymer chemistry, polymerization is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks.

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Polyoxymethylene (POM), also known as acetal, polyacetal, and polyformaldehyde, is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability.

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Printed circuit board

A printed circuit board (PCB) mechanically supports and electrically connects electronic components or electrical components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate.

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A propellant or propellent is a chemical substance used in the production of energy or pressurized gas that is subsequently used to create movement of a fluid or to generate propulsion of a vehicle, projectile, or other object.

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Propellants, Explosives, Pyrotechnics

Propellants, Explosives, Pyrotechnics (PEP)is a monthly peer-reviewed chemistry journal that covers all disciplines of explosives.

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Pyrolysis is the thermal decomposition of materials at elevated temperatures in an inert atmosphere.

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Pyrotechnic composition

A pyrotechnic composition is a substance or mixture of substances designed to produce an effect by heat, light, sound, gas/smoke or a combination of these, as a result of non-detonative self-sustaining exothermic chemical reactions.

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Pyrotechnic initiator

A pyrotechnic initiator (also initiator or igniter) is a device containing a pyrotechnic composition used primarily to ignite other, more difficult-to-ignite materials, e.g. thermites, gas generators, and solid-fuel rockets.

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Radical (chemistry)

In chemistry, a radical (more precisely, a free radical) is an atom, molecule, or ion that has an unpaired valence electron.

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Radio frequency

Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.

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A radiometer or roentgenometer is a device for measuring the radiant flux (power) of electromagnetic radiation.

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Radiometry is a set of techniques for measuring electromagnetic radiation, including visible light.

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Relative permittivity

The relative permittivity of a material is its (absolute) permittivity expressed as a ratio relative to the permittivity of vacuum.

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Roy J. Plunkett

Roy J. Plunkett (June 26, 1910 – May 12, 1994) was an American chemist.

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Safflower (Carthamus tinctorius) is a highly branched, herbaceous, thistle-like annual plant.

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Science History Institute

The Science History Institute is an institution that preserves and promotes understanding of the history of science.

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Slide plate

A slide plate is linear bearing such as may be part of the expansion joints of bridges, high temperature horizontal ducts of water-tube boilers and other mechanical or structural engineering applications.

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Smoke point

The smoke point also known as burning point of an oil or fat is the temperature at which, under specific and defined conditions, it begins to produce a continuous bluish smoke that becomes clearly visible.

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Solid-propellant rocket

A solid-propellant rocket or solid rocket is a rocket with a rocket engine that uses solid propellants (fuel/oxidizer).

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Soot is a mass of impure carbon particles resulting from the incomplete combustion of hydrocarbons.

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A stenosis is an abnormal narrowing in a blood vessel or other tubular organ or structure.

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Sublimation (phase transition)

Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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According to the classical definition, a superacid is an acid with an acidity greater than that of 100% pure sulfuric acid, which has a Hammett acidity function (H0) of −12.

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Superhydrophobic coating

A superhydrophobic coating is a nanoscopic surface layer that repels water.

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Surfactants are compounds that lower the surface tension (or interfacial tension) between two liquids, between a gas and a liquid, or between a liquid and a solid.

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Swiss Diamond International

Swiss Diamond International is a Swiss based cookware company.

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Tefal is a French cookware and small appliance manufacturer owned by Groupe SEB.

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Tetrafluoroethylene (TFE) is a fluoromonomer with chemical formula C2F4.

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The New York Times

The New York Times (sometimes abbreviated as The NYT or The Times) is an American newspaper based in New York City with worldwide influence and readership.

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The Sydney Morning Herald

The Sydney Morning Herald (SMH) is a daily compact newspaper published by Fairfax Media in Sydney, Australia.

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Thermal diffusivity

In heat transfer analysis, thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure.

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Thermal expansion

Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature.

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Thermobaric weapon

A thermobaric weapon is a type of explosive that uses oxygen from the surrounding air to generate a high-temperature explosion, and in practice the blast wave typically produced by such a weapon is of a significantly longer duration than that produced by a conventional condensed explosive.

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A thermoplastic, or thermosoftening plastic, is a plastic material, a polymer, that becomes pliable or moldable above a specific temperature and solidifies upon cooling.

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Thread seal tape

Thread seal tape (also known as PTFE tape or plumber's tape) is a polytetrafluoroethylene (PTFE) film tape commonly used in plumbing for sealing pipe threads.

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A toxicant (pronounced TOK-sih-kunt) is any toxic substance.

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Trabeculectomy is a surgical procedure used in the treatment of glaucoma to relieve intraocular pressure by removing part of the eye's trabecular meshwork and adjacent structures.

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Ulcerative colitis

Ulcerative colitis (UC) is a long-term condition that results in inflammation and ulcers of the colon and rectum.

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Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.

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University of California, Berkeley

The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public research university in Berkeley, California.

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Uranium hexafluoride

Uranium hexafluoride, referred to as "hex" in the nuclear industry, is a compound used in the uranium enrichment process that produces fuel for nuclear reactors and nuclear weapons.

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Van der Waals force

In molecular physics, the van der Waals forces, named after Dutch scientist Johannes Diderik van der Waals, are distance-dependent interactions between atoms or molecules.

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Veins are blood vessels that carry blood toward the heart.

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Xenon difluoride

Xenon difluoride is a powerful fluorinating agent with the chemical formula, and one of the most stable xenon compounds.

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Yield (engineering)

The yield point is the point on a stress–strain curve that indicates the limit of elastic behavior and the beginning of plastic behavior.

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Young's modulus

Young's modulus, also known as the elastic modulus, is a measure of the stiffness of a solid material.

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[1] https://en.wikipedia.org/wiki/Polytetrafluoroethylene

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