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  2. Kevlar - Wikipedia

    en.wikipedia.org/wiki/Kevlar

    Kevlar (para-aramid) [2] is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, [ 3 ] [ 2 ] [ 4 ] the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires.

  3. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    Graphite flakes can cost around US$0.9/kg carbon. [20] Price of synthetic industrial diamond for grinding and polishing can range from 1200 to 13 300 USD/kg, while cost per weight of large synthetic diamonds for industrial applications can be on the order of million dollars per kilogram. [21] 7: N: Nitrogen: 0.0012506: 19 (5.263 × 10 17 kg) 0. ...

  4. Small Arms Protective Insert - Wikipedia

    en.wikipedia.org/wiki/Small_Arms_Protective_Insert

    The Kevlar Interceptor vest itself is designed to stop projectiles up to and including 9×19mm Parabellum ... but costs about $600 per plate, ... 1.27 kg (2.8 lb ...

  5. Bulletproof vest - Wikipedia

    en.wikipedia.org/wiki/Bulletproof_vest

    The Improved Outer Tactical Vest (IOTV) in MultiCam, as issued to United States Army soldiers. A bulletproof vest, also known as a ballistic vest or a bullet-resistant vest, is an item of body armour that helps absorb the impact and reduce or stop penetration to the torso by firearm-fired projectiles and fragmentation from explosions.

  6. Specific strength - Wikipedia

    en.wikipedia.org/wiki/Specific_strength

    The specific strength is a material's (or muscle's) strength (force per unit area at failure) divided by its density. It is also known as the strength-to-weight ratio or strength/weight ratio or strength-to-mass ratio. In fiber or textile applications, tenacity is the usual measure of specific strength. The SI unit for specific strength is Pa ...

  7. Aramid - Wikipedia

    en.wikipedia.org/wiki/Aramid

    The term aramid is shortened from aromatic polyamide. It was introduced in 1972, [2] accepted in 1974 by the Federal Trade Commission of the USA as the name of a generic category of fiber distinct from nylon, [3][4] and adopted by the International Standards Organisation in 1977. [citation needed] Aromatic in the longer name refers to the ...

  8. Kevlar KM2 - Wikipedia

    en.wikipedia.org/wiki/Kevlar_KM2

    Kevlar KM2 is a synthetic para-aramid fibre produced by DuPont. The fiber is an evolution of the original Kevlar fibre. The following quotes summarise Kevlar KM2's properties. "DuPont created Kevlar KM2 to achieve the performance goals defined by casualty reduction testing for the Department of Defense. Today it is used extensively for ...

  9. O'Neill cylinder - Wikipedia

    en.wikipedia.org/wiki/O'Neill_cylinder

    An O'Neill cylinder (also called an O'Neill colony) is a space settlement concept proposed by American physicist Gerard K. O'Neill in his 1976 book The High Frontier: Human Colonies in Space. [1] O'Neill proposed the colonization of space for the 21st century, using materials extracted from the Moon and later from asteroids.

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