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Ferrosilicon is used as a source of silicon to reduce metals from their oxides and to deoxidize steel and other ferrous alloys. This prevents the loss of carbon from the molten steel (so called blocking the heat); ferromanganese, spiegeleisen, calcium silicides, and many other materials are used for the same purpose. [5]
A concentric reducer is used to join pipe sections or tube sections on the same axis. [1] The concentric reducer is cone -shaped, and is used when there is a shift in diameter between pipes. [ 1 ] For example, when a 1" pipe transitions into a 3/4" pipe and the top or bottom of the pipe doesn't need to remain level. [ 2 ]
These might be delivered as an oil or a water-based emulsion. The silicone compound consists of a hydrophobic silica dispersed in a silicone oil. Emulsifiers are added to ensure that the silicone spreads fast and well in the foaming medium. The silicone compound might also contain silicone glycols and other modified silicone fluids. [5]
Pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate) is a chemical compound composed of four sterically hindered phenols linked through a pentaerythritol core. It is used as primary antioxidant for stabilizing polymers , particularly polyethylene and polypropylene .
Silicone caulk can be used as a basic sealant against water and air penetration. In organosilicon and polymer chemistry, a silicone or polysiloxane is a polymer composed of repeating units of siloxane (−O−R 2 Si−O−SiR 2 −, where R = organic group). They are typically colorless oils or rubber-like substances. Silicones are used in ...
In 1943–44, 20 additional 4.5-inch howitzers were received. Thirty-eight 4.5-inch howitzers, all on carriage Mk1PA, were used by the reserve FCA. The QF 4.5 survived in use with the Irish Army until the 1960s. They were fired by the FCA (An Fórsa Cosanta Áitiúil – local defence force) on the Glen of Imaal firing range, County Wicklow ...
The historical accuracy of many of the aspects of the John Henry legend are subject to debate. [1] [2] According to researcher Scott Reynolds Nelson, the actual John Henry was born in 1848 in New Jersey and died of silicosis, a complication of his workplace, and not due to proper exhaustion of work.
The hammer-part of the Lucerne hammer is a three-to-four-pronged head mounted atop a 2-metre (6.6 ft) long polearm shaft. It bears a long spike on its reverse, and an even longer spike extending from the top. They are occasionally found to have spikes on the side of the head as well.
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