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Kevlar Bullet
What thickness of Kevlar sheet would be required in the following example?
If a bullet (such as a 7.62 x 39mm rifle bullet or a 12 ga. shotgun slug) were fired into a hollow sheet metal cube (such as a locker), what thickness of Kevlar sheet would have to be on the opposite side of the cube to stop continued travel and penetration of the projectile?
To better clarify this question ... the Kevlar would be "sandwiched" between the "sheet metal cube" and a cinderblock wall. The Kevlar have be used to protect everything that is behind the "sheet metal cube". The "sheet metal cube" can be sacrificed, the items behind the "sheet metal cube' cannot be sacrificed.
Also, the projectile would be fired at point blank distance using hunting or military surplus ammunition out of a firearm with an average of 20" barrel.
Not enough information, besides what's already mentioned, i.e. is the bullet armor piercing? You would need at least type III armor protection, which will not be just Kevlar. Maybe a combination of Kevlar and Ceramic material plates.
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 | Point Blank Body Armor, Kevlar, Bullet Proof Vest. IIIA Size L |  | 23 Bids | US $157.50 | 1d 52m |
 | Black Bullet Proof Protection 3A Ballistic Helmet Bulletproof IIIA Pasgt Kevlar | |  | US $289.00 | 19d 16h 29m |
 | New Kevlar Bullet NIJ Proof Vest Defense Bulletproof Armor Level IIIA Size L | | | US $266.00 | 28d 8h 56m |
 | Vest Armor Bulletproof Body Kevlar Bullet NIJ Proof Defense Level IIIA Size S | | 0 Bid | US $275.00 | 1d 19h 21m |
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 | Lightweight Bullet Knife Proof kevlar Vest +24 Joules Body Armor3A S-M-L-XL-2XL | | | US $429.00 | 19d 19h 37m |
 | Bullet Proof Vest military Kevlar BodyArmor Level 3A IIIA NIJ Balistic M-L-XL-2X | | | US $359.00 | 2d 1h 53m |
 | Body Kevlar Vest Anti Resistant Defense IIIA Armor 3A Bullet Proof S M L XL XXL | | | US $379.65 | 28d 16h 7m |
 | New Kevlar Bullet Proof Vest/Jacket Body Armor NIJ Level IIIA 3A 38 Layers XXXXL | | | US $311.88 | 13d 14h 37m |
 | Kevlar Bullet Proof Vest Panels Green Medium | | | US $120.00 | 28d 2h 50m |
 | Kevlar Bullet Proof Vest/jacket Body Armor NIJ Level IIIA/3A XL safe | | | US $247.48 | 1d 8h 6m |
 | New Kevlar Bullet Proof Vest/Jacket Body Armor NIJ Level IIIA 3A 38 Layers XXL | | | US $275.08 | 13d 14h 37m |
 | New Kevlar Bullet Proof Vest/Jacket Body Armor NIJ Level IIIA 3A 38 Layers XL | | | US $256.68 | 13d 14h 37m |
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| | Superlift 91310 Bullet Proof Kevlar $149.06 Superlift 91310 91310 Bullet Proof Kevlar; Brake Hose; Front; Reinforced Braided Stainless Steel; Vehicles w/4-6 in. Lift; |
| | Superlift 91510 Bullet Proof Kevlar $159.34 Superlift 91510 91510 Bullet Proof Kevlar; Brake Hose; Front; Reinforced Braided Stainless Steel; Length Over Stock 4 in.; Vehicles w/4-8 in. Lift; |
| | Superlift 91350 Bullet Proof Kevlar $140 Superlift 91350 91350 Bullet Proof Kevlar; Brake Hose; Front; Reinforced Braided Stainless Steel; Length Over Stock 4 in.; Vehicles w/4-6 in. Lift; |
| | Superlift 91336 Bullet Proof Kevlar $55.94 Superlift 91336 91336 Bullet Proof Kevlar; Brake Hose; Rear; Reinforced Braided Stainless Steel; Length Over Stock 9 in.; Vehicles w/8-12 in. Lift; |
| | Bullet Proof Kevlar; Brake Hose for Jeep $144.89 1987-89 YJ Wrangler;Bulletproof Kevlar;Front;Reinforced braided stainless steel;Vehicles with 3-4" lift JEEP WRANGLER (87-95YJ) ISLANDER LAREDO S SAHARA SPORT 1987 1988 1989 2.5L (150) 4.2L (258) GAS Bullet Proof Kevlar; Brake Hose for Jeep |
| | Kevlar CVT Drive Belt 842-20-30 $49.59 Performance Kevlar CVT Drive Belt size 842-20-30 for 150cc and 125cc GY6 QMJ152/157 and QMI152/157 4-stroke engines. Our kevlar drive belts are made from the same material as bullet proof vests. Stronger than OEM quality, these belts are made to last. Length: 842mm Top Width: 20mm Groove Angle: 30a |
| | Bullet $6.99 Bullet |
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45 ACP vs Kevlar bullet-proof vest...
Which ballistic material is better for Bullet proof vests, Kevlar or Spectra?
I wanna say Kevlar is better..
The development of kevlar body armor by NIJ was a four-phase effort that took place over several years. The first phase involved testing kevlar fabric to determine whether it could stop a lead bullet. The second phase involved determining the number of layers of material necessary to prevent penetration by bullets of varying speeds and calibers and developing a prototype vest that would protect officers against the most common threats: the 38 Special and the 22 Long Rifle bullets.
Researching Kevlar Bullet Proof Vests
By 1973, researchers at the Army's Edgewood Arsenal responsible for the bullet proof vest design had developed a garment made of seven layers of Kevlar fabric for use in field trials. It was determined that the penetration resistance of Kevlar was degraded when wet. The bullet resistant properties of the fabric also diminished upon exposure to ultraviolet light, including sunlight. Dry-cleaning agents and bleach also had a negative effect on the antiballistic properties of the fabric, as did repeated washing. To protect against these problems, the vest was designed with waterproofing, as well as with fabric coverings to prevent exposure to sunlight and other degrading agents.
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