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Some types of vacuum-insulated flasks use an inner layer of glass (which is easy to clean), and an outer layer of metal or plastic which helps shield the glass from breakage. Such bottles may still break if dropped, and thus some brands are triple-layer, with the glass inside two layers of plastic; this is a common configuration for large ...
Some companies, such as coffee retailers [9] and doughnut shops, [10] sell their products in disposable cups. A 2011 book estimated that a chain of doughnut shops used one billion disposable coffee cups in a year, enough to circle the Earth twice. [10]
Usually made of plastic, the first patent for a coffee cup lid design was filed in 1967 and focused on creating a tight seal between the cup and the lid to reduce leaking and a vent hole to allow steam to escape. [15] [16] [17] However, there was no opening for drinking, and the consumer would have to tear into the lid. [18]
PC is a clear plastic used to make bottles for milk and water. Five-gallon water bottles are a common application of PC. Polypropylene (PP) PP is used primarily for jars and closures. It is rigid and is a barrier to moisture. Polypropylene is stable at temperatures up to 220 °F (104 °C).
General-purpose polystyrene is clear, hard, and brittle. It is an inexpensive resin per unit weight. It is a poor barrier to air and water vapor and has a relatively low melting point. [6] Polystyrene is one of the most widely used plastics, with the scale of its production being several million tonnes per year. [7]
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