Apparently this stuff is laminate and also goes by the name Dyneema and Spectra. What is wrong with laminate body armor besides not being able to take contact shots?
" Ultralight Ballistic & Anti Stab Vest
Product data sheet of UHMWPE
UHMWPE is an anti-ballistic composite material designed to manufacture lightweight and flexible body armor used & specified by US Air forces, Marines, LAPD, NYPD, SWAT, British Air forces and French Army.
UHMWPE is an excellent product to provide efficient protection against "hard" and difficult to deform handgun threats including 9mm FMJ bullets, UZI's and Russian ( Makarov, Tokarev ) & Chinese ( 54 Pistol, 79 Mini-machinegun ) bullets.
The specification of UHMWPE is as follows:
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Areal density : 140 - 150 g/m2 (4.13 - 4.42 oz/yd2)
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Ballistic performance:
Energy absorption: 245 J/(kg/m2) analogous to STANAG 2920.
Tested on 17 plies against 9 mm Parabellum,
Full Metal Jacket by Dynamit Nobel.
Advantages of this Material over the commonly found ballistic material in USA, Europe and All over the world: First we have to consider the type of materials, it's characteristic, nature in terms of strength, environmental effect, chemical reaction to contamination, and finish product (how and what purpose to be used meaning its design.) Also There are 3 major factor to consider to acquire a good quality body armor: 1st is the Strength (durability), 2nd is the Weight and 3rd is the Design.
UHMWPE is the super fiber name for Ultra High Molecular Weight Polyethylene (UHMWPE) and it is generally known to be a plastic material that can resist all type of Chemicals & tested under extreme conditions that last for hundreds of years "no expiration of quality of the material" unlike Kelvar or Twaron it's an Aramid fiber that has a limitation on certain chemicals and heat, it also loses it's strength and expire in a certain period of time.
1.
Strength: UHMWPE Super Fiber, the world's strongest fiber: is 15 times stronger than Steel vs Kelvar is only 5 times stronger than Steel of the same weight (Tenacity ranging from 2.7 to 4 N/tex). A Single Strand of Dyneema can carry a 240 lbs of load.
2.
Lightness: UHMWPE Super Fiber is highly water resistant, does not absorb liquid & a floats on water. It's tread is use in sport/ military paragliding, ship anchorage, fishing nets, sport fishing, protection in cut-resistant gloves & favor best by the US Navy seal for the dual purpose of ballistic vest and as life saving floater (Density = 970kg/m3, 5% less than sea water).
3.
Design: UHMWPE Uni-directional Bulletproof vest design is far much better & stronger in terms of Ballistic performance than the woven Kevlar/Twaron Vest type.
Two direct Advantage of Uni-directional over Kevlar weave/ woven design:
UHMWPE Uni-directional is compress tightly by aligning Dyneema fibers side by side and bonding them with a flexible abrasion-resistant Kraton resin film to make a single-ply sheet. Two plies of such sheets are crossed, so that the fibers in one are perpendicular to the fibers in the other, and bonded again together resulting to very low blunt trauma effect & exposure to water has no effect on its ballistic resistance which is the common problem of Kevlar vest.
Product data sheet of UHMWPE
1. ANTI SLIP/ SKID: Uni-Directional design ply are more stable specially in wet and angle shooting because Uni Directional is tightly pressed & bonded together that there is no space left to skid in any direction & It has an excellent stopping power, angle shot & exceptional multi-hit capability. vs Kevlar /Twaron is weave/ woven design which can not be compressed closely together that when a bullet enters at very high velocity the woven fibers tends to slide & skids on all side thereby creating tiny space hole in the center for the bullet to easily penetrate to the first 2~3 ply specially when done in an angle shooting on in wet condition.
2. LOW BACKFACE SIGNATURE & TRAUMA REDUCTION Benefits.
"NIJ Maximum allowable backface signature deepness is 44mm" any thing over than this is considered to be fetal & dangerous".
> Aramid Kevlar / Twaron - Tested maximum deepness is 27mm.
> Dyneema Uni-directional - Tested maximum deepness is 15mm.
Uni-directional has a higher tensile strength than that of an Aramid fiber. It can handle & absorb high stress & high sonic velocity 12,300 m/s point of impact. Because of the design it allows the bullet's energy to be absorbed in a large spread Circular shape area of first few layers of the armor. The impact energy is easily dissipate very rapidly over a large area. This result in a very low deepness of the blunt trauma, the indention on the inside surface side of the vest. for this reason the Uni-direction design does not require any blunt trauma liner. Unlike the Aramid Kevlar : The backface deepness of the ballistic impact is more deep CONE shape thereby requiring a Blunt trauma liner or sheet, if without may cause sever injury.
> Tested Nov.2003: It took only 5 ply/sheet to stop a 9mm Sig Sauer Caliber shot at point blank range of 8ft, unlike a standard Kelvar /Twaron vest which would take a total of 8ply/Sheet to stop the same.
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