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Plastic barrels that are commonly seen on American roadways today began emerging in the late 1970s and 1980s; steel 55-gallon drums were largely phased out by the 1990s, [4] with an outright prohibition on using metal drums appearing in the third revision of the 1988 Edition of the MUTCD, published in September 1993.
Plastic drums are typically made of blow molded high density polyethylene. [20] [21] They are available in a variety of sizes and constructions designed for specific purposes and markets. Plastic drums are used for liquids, granular solids, and inner packages. When designed, tested, and labeled, plastic drums can be used with dangerous goods or ...
HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE. [6]
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He believed new aluminum-producing facilities would need to be built to meet demand. Reynolds Metals Company leased, and later bought, six government defense plants that were up for disposal. Reynolds later expanded into non aluminum products such as plastics and precious metals, introducing Reynolds Plastic Wrap in 1982.
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