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polyvinyl chloride
polyvinyl chloride (PVC), thermoplastic that is a polymer of vinyl chloride. Resins of polyvinyl chloride are hard, but with the addition of plasticizers a flexible, elastic plastic can be made. This plastic has found extensive use as an electrical insulator for wires and cables. Cloth and pape...
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epoxy resins
epoxy resins group of synthetic resins used to make plastics and adhesives. These materials are noted for their versatility, but their relatively high cost has limited their use. High resistance to chemicals and outstanding adhesion, durability, and toughness have made them valuable as coatings. ...
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balm
balm name for any balsam resin and for several plants, e.g., the bee balm .
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resin
resin any of a class of amorphous solids or semisolids. Resins are found in nature and are chiefly of vegetable origin. They are typically light yellow to dark brown in color; tasteless; odorless or faintly aromatic; translucent or transparent; brittle, fracturing like glass; and flammable, burning...
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Canada balsam
Canada balsam yellow, oily, resinous exudation obtained from the balsam fir . It is an oleoresin (see resin ) with a pleasant odor but a biting taste. It is a turpentine rather than a true balsam. On standing, the essential oil in Canada balsam evaporates, leaving behind the resin as a hard, tr...
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mastic
mastic resin obtained from the small mastic tree Pistacia lentiscus (of the sumac family), found chiefly in Mediterranean countries. When the bark of the tree is injured, the resin exudes in drops. It is transparent and pale yellow to green in color. Mastic is used chiefly in making varnish b...
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bdellium
bdellium , aromatic gum resin obtained from trees of the genus Commiphora ( Balsamodendron of the incense-tree family). It is similar to myrrh. Bdellium is used in medicines and perfumes.
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balsam
balsam , fragrant resin obtained from various trees. The true balsams are semisolid and insoluble in water, but they are soluble in alcohol and partly so in hydrocarbons. They contain benzoic or cinnamic acid; these include Peru balsam and tolu balsam (both obtained from varieties of the South Ame...
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melamine
melamine , common name for 2,4,6-triamino-1,3,5-triazine. Melamine is a trimer (see polymer ) of cyanamide, H 2 NC[triple bond]N, and is synthesized from calcium carbide. It condenses with formaldehyde to give a thermosetting resin . Melamine resins have many uses, including the manufacture of pla...
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benzine
benzine , colorless, highly flammable liquid. It is used as a cleaning agent because it is a solvent for organic substances such as fats, oils, and resins and is also used in the preparation of certain dyes and paints. Benzine is a mixture of hydrocarbons, chiefly alkanes such as pentane and hexane....
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