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Possible Answers:
ABS.
Last seen on: Daily Boston Globe Crossword Sunday, 23 July 2023
Random information on the term “Washboard __”:
A washboard is a tool designed for hand washing clothing. With mechanized cleaning of clothing becoming more common by the end of the 20th century, the washboard has become better known for its secondary use as a musical instrument.
The traditional washboard is usually constructed with a rectangular wooden frame in which are mounted a series of ridges or corrugations for the clothing to be rubbed upon. For 19th-century washboards, the ridges were often of wood; by the 20th century, ridges of metal were more common. A “fluted” metal washboard was patented in the United States by Stephen Rust in 1833. Zinc washboards were manufactured in the United States from the middle of the 19th century. In the late 20th century and early 21st century, ridges of galvanized steel are most common, but some modern boards are made of glass. Washboards with brass ridges are still made.
Many parts of the world still use washboards for washing clothes. Clothes are soaked in hot soapy water in a washtub or sink, then squeezed and rubbed against the ridged surface of the washboard to force the cleansing fluid through the cloth to carry away dirt. Washboards may also be used for washing in a river, with or without soap. Then the clothes are rinsed. The rubbing has a similar effect to beating the clothes and household linen on rocks, an ancient method, but is less abrasive. Military personnel often use washboards to do their laundry when no local laundry facilities exist.
Random information on the term “ABS”:
Acrylonitrile butadiene styrene (ABS) (chemical formula (C8H8)x·(C4H6)y·(C3H3N)z ) is a common thermoplastic polymer. Its glass transition temperature is approximately 105 °C (221 °F). ABS is amorphous and therefore has no true melting point.
ABS is a terpolymer made by polymerizing styrene and acrylonitrile in the presence of polybutadiene. The proportions can vary from 15% to 35% acrylonitrile, 5% to 30% butadiene and 40% to 60% styrene. The result is a long chain of polybutadiene crisscrossed with shorter chains of poly(styrene-co-acrylonitrile). The nitrile groups from neighboring chains, being polar, attract each other and bind the chains together, making ABS stronger than pure polystyrene. The acrylonitrile also contributes chemical resistance, fatigue resistance, hardness, and rigidity, while increasing the heat deflection temperature. The styrene gives the plastic a shiny, impervious surface, as well as hardness, rigidity, and improved processing ease. The polybutadiene, a rubbery substance, provides toughness and ductility at low temperatures, at the cost of heat resistance and rigidity. For the majority of applications, ABS can be used between −20 and 80 °C (−4 and 176 °F), as its mechanical properties vary with temperature. The properties are created by rubber toughening, where fine particles of elastomer are distributed throughout the rigid matrix.