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C-4 or Composition C-4 is a common variety of the plastic explosive family known as Composition C, which uses RDX as its explosive agent. C-4 is composed of explosives, plastic binder, plasticizer to make it malleable, and usually a marker or odorizing taggant chemical.
The British used a plastic explosive during World War II as a demolition charge. The specific explosive, Composition C, was 88.3% RDX and 11.7% non-oily, non-explosive plasticizer. [8] The material was plastic between 0 and 40 °C (32–104 °F), but was brittle at colder temperatures and gummy at higher temperatures.
The company expected its products to last many charge/discharge cycles, [6] twice as long as a lead-acid battery. Costs were claimed to be about the same as with lead-acid. [7] [8] In October 2014, they announced a new generation with a single stack reaching 2.4 kWh and a multi-stack module holding 25.5 kWh. [9] [10]
The spherical case shot weighed 5.7 lb (2.6 kg) and released 41 musket balls when it burst. The canister round weighed 7.32 lb (3.3 kg) and contained 27 iron balls. [ 17 ] At 5° elevation, the gun could hurl the round shot a distance of 1,523 yd (1,392.6 m) with the standard firing charge of 1.25 lb (0.6 kg).
6-pounder gun or 6-pdr, usually denotes a 57-millimetre (2.2 in) gun firing a projectile weighing approximately 6 pounds (2.7 kg). Guns of this type include: QF 6 pounder Hotchkiss , a 57 mm naval gun of the 1880s; a similar weapon was designed by Driggs-Schroeder for the US Navy
Light guide LEDs using plastic light guides on a network switch. The technology was rendered obsolete by the development of light-emitting diodes (LED) in the 1970s, though lightguide tubes are still used in electronics manufacturing, in situations where it is difficult to place an LED in the appropriate physical location on a display or bezel.