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Refractory metals are a class of metals that are extraordinarily resistant to heat and wear. The expression is mostly used in the context of materials science , metallurgy and engineering . The definition of which elements belong to this group differs.
The VS-50AR is an electronically fuzed version of the mine which contains an integral mercury tilt switch, that operates as an anti-handling device. The VS-50AR has a dummy pressure plate on top and its external appearance is very similar to the VS-50, which has obvious implications for demining personnel.
Slate is particularly suitable as a roofing material as it has an extremely low water absorption index of less than 0.4%, making the material resistant to frost damage. [18] Natural slate, which requires only minimal processing, has an embodied energy that compares favorably with other roofing materials. [ 19 ]
A soldier examines two inverted VS-1.6 blast-resistant anti-tank landmines. Cut-away view of a VS-MK2 blast-resistant anti-personnel mine. A blast resistant mine is a landmine (intended for anti-tank or anti-personnel purposes) with a fuze which is designed to be insensitive to the shock wave from a nearby explosion.
Unsourced material may be challenged and removed. Find sources: "Hardnesses of the elements" data page – news · newspapers · books · scholar · JSTOR ( June 2022 ) ( Learn how and when to remove this message )
For the most demanding items even low-background steel can be too radioactive and other materials like high-purity copper may be used. [4] In cases where World War II–era shipwrecks in and near the relatively shallow Java Sea and western South China Sea have been illegally scavenged, it has been suggested that the target is low-background ...
The smelting of copper, lead and bauxite in non-ferrous smelting, for instance, is designed to remove the iron and silica that often occurs with those ores, and separates them as iron-silicate-based slags. [1] Copper slag, the waste product of smelting copper ores, was studied in an abandoned Penn Mine in California, US.
The expanded graphite can be used to make graphite foil or used directly as a "hot top" compound to insulate molten metal in a ladle or red-hot steel ingots and decrease heat loss, or as firestops fitted around a fire door or in sheet metal collars surrounding plastic pipe (during a fire, the graphite expands and chars to resist fire ...