Utilizador:Diogo Alves/Rascunho: diferenças entre revisões
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Vidro vantagens e desvantagens |
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Glass has beenand will remainan important packaging material for a number of products because it is strong, durable, transparent, and chemically inert. Pleasing to the eye, it evokes an image of quality and allows the consumer to see the product. Glass is impervious to transmission of gases and products and, therefore, is used extensively to contain delicate flavor and perfume essences. It also is proof against the harshest acids and bases known to chemistry (except for hydrofluoric acid, which is actually used to etch glass).
Glass containers also can be used in microwave ovens and served at the table without the contents being transferred to another receptacle. All colors of glassflint, green, opal, and amberare equally transparent to microwave energy. It is strongly recommended that closures be loosened before the containers are put into the oven for heating to prevent pressure buildup. But even when it is on tight, tests indicate that the cap will blow off before the container explodes.
Glass is made from relatively inexpensive domestic raw materials, but the process is rather energy-intensive.
Despite lightweighting efforts, glass is still heavier than a comparably sized plastic or aluminum container, which means it is more costly to transport. Breakability is another negative although new coatings that reduce abrasion and, therefore, breakage are being pursued.
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