- published: 18 Feb 2016
- views: 1949562
Kevlar is the registered trademark for a para-aramid synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, this high-strength material was first commercially used in the early 1970s as a replacement for steel in racing tires. Typically it is spun into ropes or fabric sheets that can be used as such or as an ingredient in composite material components.
Currently, Kevlar has many applications, ranging from bicycle tires and racing sails to body armor, because of its high tensile strength-to-weight ratio; by this measure it is 5 times stronger than steel. It is also used to make modern drumheads that withstand high impact. When used as a woven material, it is suitable for mooring lines and other underwater applications.
A similar fiber called Twaron with roughly the same chemical structure was developed by Akzo in the 1970s; commercial production started in 1986, and Twaron is now manufactured by Teijin.
Poly-paraphenylene terephthalamide – branded Kevlar – was invented by Polish-American chemist Stephanie Kwolek while working for DuPont, in anticipation of a gasoline shortage. In 1964, her group began searching for a new lightweight strong fiber to use for light but strong tires. The polymers she had been working with at the time, poly-p-phenylene-terephthalate and polybenzamide, formed liquid crystal while in solution, something unique to those polymers at the time.
Let's blast some kevlar!!!!!!!!!! Body Armor Here! http://www.ar500armor.com The BEST channel on youtube: https://www.youtube.com/VetRanch http://www.facebook.com/DemolitionRanch https://instagram.com/demolition_ranch/ https://twitter.com/DemolitionRanch "Club Diver" by Kevin MacLeod from incompetech.com. Outro music by MDK, https://www.youtube.com/watch?v=2_t5Lm040Gw
In this video we shoot some level IIIa soft body armor. Even though this was expired, it performed nearly as well as it would new. We discovered a fatal-flaw in this type of armor, however. We need to come up with a name for the dummy. "California Karl"? He has no right to bear arms... get it? I want to thank Gregg for donating the vest!
Today we answer the age old question; what's the difference between Carbon fibre/fiber, Kevlar and Fibreglass? 30 Second version here: https://www.youtube.com/watch?v=0YmCkUqbphU Links to videos used as filler material Random tensile test: https://www.youtube.com/watch?v=D8U4G5kcpcM Carbon tension test: https://www.youtube.com/watch?v=u_XDUWgzs_Y Carbon manufacturing video: https://www.youtube.com/watch?v=kaoq8Mc4xxw Sparks from F1: https://www.youtube.com/watch?v=dYCNkdgrx9c F1 wing flex: https://www.youtube.com/watch?v=7U8GHTRU_Ak Wing Failure: https://www.youtube.com/watch?v=1Fr1tpeLBYI Facebook: https://www.facebook.com/Kyleengineers Patreon: https://www.patreon.com/KYLEDRIVES Instagram: https://www.instagram.com/shadowraceengineering/ Race car consulting: http://www.jkfaero.com G+...
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Testing the Level IIA Kevlar against various knives. Knives used are the Opinel Eff 12 knife, AKM bayonet knife, Mtech Marine knife and the Lee Enfield Spike bayonet. Please comment, rate and subscribe for more. Follow me on Facebook for updates: https://www.facebook.com/Weaponsandstuff93/
Fun Gun Reviews Presents: "Shooting Kevlar Helmets" We do a shooting test with calibers from 22LR to 5.56 to see what the Current Mil-Std Level IIIA PASGT & MICH Helmets will defeat. Thanks to HighCom Security for sending the helmets for the test. They are protecting the Good guys, both our Military, Law Enforcement and Civilians from Bullets and Bombs. Highcom Security Website: http://highcomsecurity.com/ Big thank you to Rodney at the NCHeel YouTube Channel for all the assistance. NCHeel: https://www.youtube.com/user/NCHeel Also thanks to ShootSteel.com http://www.shootsteel.com/ Hit the Like Button & Subscribe for more Fun Gun Reviews. Thanks for watching~ Sootch00 Instagram: Sootch_00 FaceBook: https://www.facebook.com/Sootch00FunGunReviews Music is from Jingle Punks Royalt...
Kevlar is a condensation polymer (a small molecule is made in the reaction as well as the polymer). Dr Atkinson reloaded before the bug bugged him.
Gregg and I watched a video about carbon nanotube body armor. In the video, the company representative made some claims about Kevlar that made us both go, "hmmmmm". We took an old vest with over 10,000 hours/5 years of use and shot it multiple times to see how many 9mm bullets it would stop. Since millions of people currently rely on Kevlar to protect them, we wanted to do an informal test of our own just to settle the argument. Most agencies have not approved the use of "CN" type armor and have limited budgets, so Kevlar will be around for some time. It only does harm to make false-claims about a product. Carbon nanotube video: https://youtu.be/tgeqART8WYU?t=236
Heute Nacht wird dir klar dass der Liebe Gott dich nich liebt
dass sich der Tag der Erlösung noch etwas verschiebt
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Der letzte Gedanke versinkt im vorletzten Glas
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