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polypropylene
polypropylene , plastic noted for its light weight, being less dense than water; it is a polymer of propylene. It resists moisture, oils, and solvents. Since its melting point is 121°C (250°F), it is used in the manufacture of objects that are sterilized in the course of their use. Polyp...
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isopropanol
isopropanol isopropyl alcohol, or 2-propanol , (CH 3 ) 2 CHOH, a colorless liquid that is miscible with water. It melts at -89°C and boils at 82.3°C. It is poisonous if taken internally. It is a major component of rubbing alcohols. Isopropanol is a secondary alcohol . It is one...
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antifreeze
antifreeze substance added to a solvent to lower its freezing point. The solution formed is called an antifreeze mixture. Antifreeze is typically added to water in the cooling system of an internal-combustion engine so that it may be cooled below the freezing point of pure water (32°F or 0°...
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petrochemical
petrochemical any one of a large group of chemicals derived from a component of petroleum or natural gas. The cracking processes for manufacturing gasoline produce vast quantities of gaseous hydrocarbons. Originally considered waste products suitable only for use as illuminants and fuels, the gases...
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glycerol
glycerol glycerin, glycerine, or 1,2,3-propanetriol , CH 2 OHCHOHCH 2 OH, colorless, odorless, sweet-tasting, syrupy liquid. Glycerol is a trihydric alcohol . It melts at 17.8°C, boils with decomposition at 290°C, and is miscible with water and ethanol. It is hygroscop...
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rubber
rubber any solid substance that upon vulcanization becomes elastic; the term includes natural rubber ( caoutchouc ) and synthetic rubber. The term elastomer is sometimes used to designate synthetic rubber only and is sometimes extended to include caoutchouc as well.
Chemistry and Properti...
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alkene
alkene , any of a group of aliphatic hydrocarbons whose molecules contain one or more carbon-carbon double bonds (see chemical bond ). Alkenes with only one double bond have the general formula C n H 2n . In the International Union of Pure and Applied Chemistry (IUPAC) system of chemical nomenclatu...
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polymer
polymer , chemical compound with high molecular weight consisting of a number of structural units linked together by covalent bonds (see chemical bond ). The simple molecules that may become structural units are themselves called monomers; two monomers combine to form a dimer, and three monomers, a...
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latex
latex emulsion of a polymer (e.g., rubber ) in water (see colloid ). Natural latexes are produced by a number of plants, are usually white in color, and often contain, in addition to rubber, various gums, oils, and waxes. Balata, caoutchouc, chicle, and gutta-percha are produced from natural late...
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vinyl plastics
vinyl plastics group of thermoplastics used in molded products, flexible tubing, material for raincoats, and laminated safety glass. Vinyl plastics are polymers and copolymers of vinyl derivatives (i.e., derivatives of ethylene, H 2 C[symbol]CH 2 ), e.g., vinyl chloride (H 2 C=CHCl) and vinyl a...
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