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Speed Glue
In table tennis, speed glue is a glue that is used to glue rubber surfaces to the racket or paddle. Speed glue is usually applied around 30 minutes before a match starts. The use of speed glue has been found to increase the elasticity of the racket, which adds speed and spin to the ball. Speed glue works by its solvent vapours which make the porous cells of soft rubber expand. This stretches the rubber giving it a tension that in turn makes the ball behave like an object meeting a trampoline. It was discovered by accident in the 1970s when a player used bicycle puncture repair glue to fix his racket before a match. The difference in the play of the ball became immediately obvious. The high performance effect lasts only a few hours. Table tennis player Dragutin Šurbek of Yugoslavia is given the major credit for popularising this use of speed glue between 1979 and 1983. Speed glue was allowed for the last time in the 2008 Summer Olympics. From the 2012 Summer Olympics, speed gl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Table Tennis Rubber
Table tennis rubber is a type of Natural rubber, rubber used as covering on a table tennis racket, racket in table tennis. Modern table tennis rubber is usually composed of two layers: a layer of foam ("sponge") underneath and a layer of actual rubber on the surface. There are four common types of table tennis rubbers: short pips, long pips, antispin, and inverted. The thickness and density of the sponge layer underneath also affects how the rubber will handle the ball. Because of the large variety of table tennis rubbers, there are a larger variety of Table tennis styles, playing styles in table tennis than in other List of racket sports, racket sports. History Rubber was first used in table tennis with the rise of hard racket paddles in the 1930s; the rubber consisted of short pimples over a wooden blade. In the 1950s, the sponge racket was introduced. It had a layer of foam underneath the layer of rubber. The foam helps provide more spin and speed. The International Table Te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Table Tennis
Table tennis (also known as ping-pong) is a racket sport derived from tennis but distinguished by its playing surface being atop a stationary table, rather than the Tennis court, court on which players stand. Either individually or in teams of two, players take alternating turns returning a light, hollow ball over the table's net onto the opposing half of the court using small table tennis racket, rackets until they fail to do so, which results in a point for the opponent. Play is fast, requiring quick reaction and constant attention, and is characterized by an emphasis on spin, which can affect the ball's trajectory more than in other ball sports. Owed to its small minimum playing area, its ability to be played indoors in all climates, and relative accessibility of equipment, table tennis is enjoyed worldwide not just as a competitive sport, but as a common recreational pastime among players of all levels and ages. Table tennis has been an Table tennis at the Summer Olympics, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
N-hexane
Hexane () or ''n''-hexane is an organic compound, a straight-chain alkane with six carbon atoms and the molecular formula C6H14. Hexane is a colorless liquid, odorless when pure, and with a boiling point of approximately . It is widely used as a cheap, relatively safe, largely unreactive, and easily evaporated non-polar solvent, and modern gasoline blends contain about 3% hexane. The term hexanes refers to a mixture, composed largely (>60%) of ''n''-hexane, with varying amounts of the isomeric compounds 2-methylpentane and 3-methylpentane, and possibly, smaller amounts of nonisomeric C5, C6, and C7 (cyclo)alkanes. These "hexanes" mixtures are cheaper than pure hexane and are often used in large-scale operations not requiring a single isomer (e.g., as cleaning solvent or for chromatography). Isomers Uses In industry, hexanes are used in the formulation of adhesive, glues for shoes, leather products, and roofing. They are also used to extract cooking oils (such as canola oil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benzene
Benzene is an Organic compound, organic chemical compound with the Chemical formula#Molecular formula, molecular formula C6H6. The benzene molecule is composed of six carbon atoms joined in a planar hexagonal Ring (chemistry), ring with one hydrogen atom attached to each. Because it contains only carbon and hydrogen atoms, benzene is classed as a hydrocarbon. Benzene is a natural constituent of petroleum and is one of the elementary petrochemicals. Due to the cyclic continuous pi bonds between the carbon atoms, benzene is classed as an aromatic hydrocarbon. Benzene is a colorless and highly Combustibility and flammability, flammable liquid with a sweet smell, and is partially responsible for the aroma of gasoline. It is used primarily as a Precursor (chemistry), precursor to the manufacture of chemicals with more complex structures, such as ethylbenzene and cumene, of which billions of kilograms are produced annually. Although benzene is a major Chemical industry, industrial che ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halogen
The halogens () are a group in the periodic table consisting of six chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and the radioactive elements astatine (At) and tennessine (Ts), though some authors would exclude tennessine as its chemistry is unknown and is theoretically expected to be more like that of gallium. In the modern IUPAC nomenclature, this group is known as group 17. The word "halogen" means "salt former" or "salt maker". When halogens react with metals, they produce a wide range of salts, including calcium fluoride, sodium chloride (common table salt), silver bromide and potassium iodide. The group of halogens is the only periodic table group that contains elements in three of the main states of matter at standard temperature and pressure, though not far above room temperature the same becomes true of groups 1 and 15, assuming white phosphorus is taken as the standard state.This could also be the case for group 12, al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Table Tennis Federation
The International Table Tennis Federation (ITTF) is the Sport governing body, governing body for all national table tennis associations that use ITTF-approved sponge table tennis rackets. The role of the ITTF includes overseeing rules and regulations and seeking technological improvement for the sport of table tennis. The ITTF is responsible for the organization of numerous international competitions, including the World Table Tennis Championships. Founding history The ITTF was founded in 12 December 1926 by William Henry Lawes from Wymondham, the nine founding members being First Austrian Republic, Austria, First Czechoslovak Republic, Czechoslovakia, Denmark, England, Weimar Republic, Germany, Kingdom of Hungary (1920–1946), Hungary, British Raj, British India, Sweden, and Wales. The first international tournament was held in January 1926 in Berlin, while the first World Table Tennis Championships was held in December 1926 in London. Toward the end of 2000, the ITTF institut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inhalant
Inhalants are a broad range of household and industrial chemicals whose volatile vapors or pressurized gases can be concentrated and breathed in via the nose or mouth to produce intoxication, in a manner not intended by the manufacturer. They are inhaled at room temperature through volatilization (in the case of gasoline or acetone) or from a pressurized container (e.g., nitrous oxide or butane), and do not include drugs that are sniffed after burning or heating. While a few inhalants are prescribed by medical professionals and used for medical purposes, as in the case of inhaled anesthetics and nitrous oxide (an anxiolytic and pain relief agent prescribed by dentists), this article focuses on inhalant use of household and industrial propellants, glues, fuels, and other products in a manner not intended by the manufacturer, to produce intoxication or other psychoactive effects. These products are used as recreational drugs for their intoxicating effect. According to a 1995 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solvent
A solvent (from the Latin language, Latin ''wikt:solvo#Latin, solvō'', "loosen, untie, solve") is a substance that dissolves a solute, resulting in a Solution (chemistry), solution. A solvent is usually a liquid but can also be a solid, a gas, or a supercritical fluid. Water is a solvent for Chemical polarity#Polarity of molecules, polar molecules, and the most common solvent used by living things; all the ions and proteins in a Cell (biology), cell are dissolved in water within the cell. Major uses of solvents are in paints, paint removers, inks, and dry cleaning. Specific uses for Organic compound, organic solvents are in dry cleaning (e.g. tetrachloroethylene); as paint thinners (toluene, turpentine); as nail polish removers and solvents of glue (acetone, methyl acetate, ethyl acetate); in spot removers (hexane, petrol ether); in detergents (D-limonene, citrus terpenes); and in perfumes (ethanol). Solvents find various applications in chemical, pharmaceutical, oil, and gas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Table Tennis Racket
A table tennis racket is used by table tennis players. It is usually made from laminated wood covered with rubber on one or two sides depending on the player's grip. Unlike a conventional " racket", it does not include strings strung across an open frame. Table tennis rackets come in various types, including All-Wood Racket, Carbon Fiber Racket, Arylate-Carbon (ALC), Zylon-Carbon (ZLC), and hundreds of different types of table tennis rackets with different combinations of materials, structures, and brands. The differences among different types of table tennis rackets are often based on control, spin, speed, and power. Players should choose their racket based on their playing style, skill level, and personal preferences. Though the official ITTF term is "racket", the US generally uses the term "paddle", while Europe and Asia use the term "bat". Rubber variations Table tennis regulations approved by the International Table Tennis Federation (ITTF) allow different surfaces on each ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Table Tennis
Table tennis (also known as ping-pong) is a racket sport derived from tennis but distinguished by its playing surface being atop a stationary table, rather than the Tennis court, court on which players stand. Either individually or in teams of two, players take alternating turns returning a light, hollow ball over the table's net onto the opposing half of the court using small table tennis racket, rackets until they fail to do so, which results in a point for the opponent. Play is fast, requiring quick reaction and constant attention, and is characterized by an emphasis on spin, which can affect the ball's trajectory more than in other ball sports. Owed to its small minimum playing area, its ability to be played indoors in all climates, and relative accessibility of equipment, table tennis is enjoyed worldwide not just as a competitive sport, but as a common recreational pastime among players of all levels and ages. Table tennis has been an Table tennis at the Summer Olympics, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adhesive
Adhesive, also known as glue, cement, mucilage, or paste, is any non-metallic substance applied to one or both surfaces of two separate items that binds them together and resists their separation. The use of adhesives offers certain advantages over other binding techniques such as sewing, mechanical fastenings, and welding. These include the ability to bind different materials together, the more efficient distribution of stress across a joint, the cost-effectiveness of an easily mechanized process, and greater flexibility in design. Disadvantages of adhesive use include decreased stability at high temperatures, relative weakness in bonding large objects with a small bonding surface area, and greater difficulty in separating objects during testing. Adhesives are typically organized by the method of adhesion followed by ''reactive'' or ''non-reactive'', a term which refers to whether the adhesive chemically reacts in order to harden. Alternatively, they can be organized either ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
