EN 1063

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EN 1063, or CEN 1063, is a security glazing standard created by the European Committee for Standardization for measuring the protective strength of bullet-resistant glass. It is commonly used in conjunction with EN 1522 (Euronorm standard for Bullet Resistance in Windows, Doors, Shutters and Blinds) to form a ballistic classification system by which armored vehicles and structures are tested and rated. [1] A similar classification system primarily used in the United States is NIJ Standard 0108, the U.S. National Institute of Justice's Standard for Ballistic Resistant Protective Materials which includes glass and armor plate.

European Committee for Standardization standards organization

The European Committee for Standardization is a public standards organization whose mission is to foster the economy of the European Union (EU) in global trading, the welfare of European citizens and the environment by providing an efficient infrastructure to interested parties for the development, maintenance and distribution of coherent sets of standards and specifications.

Terminal ballistics

Terminal ballistics, a sub-field of ballistics, is the study of the behavior and effects of a projectile when it hits and transfers its energy to a target. Bullet design and the velocity of impact largely determine the effectiveness of its impact.

United States Federal republic in North America

The United States of America (USA), commonly known as the United States or America, is a country comprising 50 states, a federal district, five major self-governing territories, and various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is slightly smaller than the entire continent of Europe. With a population of over 327 million people, the U.S. is the third most populous country. The capital is Washington, D.C., and the most populous city is New York City. Most of the country is located contiguously in North America between Canada and Mexico.

Threat Levels

The protective strength of a glazed shielding is rated based on the type of munitions, or threat level, it is capable of withstanding. There are 7 main standard threat levels: BR1-BR7 (also written as B1-B7), each corresponding to a different type of small arms fire. Additionally, there are two other threat levels (SG1 & SG2) corresponding to shotgun munitions.

To be given a particular rating, the glazing must stop the bullet for the specified number of strikes, with multiple strikes placed within 120mm of each other. The glazing should also be shatterproof and produce no spalls after each strike. Lastly, the classification levels are numbered in order of increasing protective strength. Thus any sample complying with the requirements of one class also complies with the requirements of previous classes. However, the SG (shotgun) classes do not necessarily comply with BR classes. [2]

The precise test requirements and bullet types used are as follows:

Euronorm Standard For Security Glazing
ClassWeaponCaliberTypeWeight (g)Range (m)Velocity (m/s)Impact EnergyShots
BR1Handgun/Rifle.22 LRLB/RN2,6 ± 0,110,00 ± 0,5360 ± 10170 J3
BR2Handgun9×19mm ParabellumFJ/RN/SC8,0 ± 0,15,00 ± 0,5400 ± 10640 J3
BR3Handgun.357 MagnumFJ/CB/SC10,2 ± 0,15,00 ± 0,5430 ± 10940 J3
BR4Handgun.44 MagnumFJ/FN/SC15,6 ± 0,15,00 ± 0,5440 ± 101510 J3
BR5Rifle5.56×45mm NATOFJ/PB/SCP4,0 ± 0,110,00 ± 0,5950 ± 101800 J3
BR6Rifle7.62×51mm NATOFJ/PB/SC9,5 ± 0,110,00 ± 0,5830 ± 103270 J3
BR7Rifle7.62×51mm NATOFJ/PB/HC9,8 ± 0,110,00 ± 0,5820 ± 103290 J3

LB - Lead Bullet
FJ - Full Metal Jacket
FN - Flat Nose
RN - Round Nose
CB - Cone Bullet
PB - Pointed Bullet
SC - Soft Core (lead)
SCP - Soft Core (lead) & Steel Penetrator
HC - Hard core, steel hardness > 63 HRC [3]

Rockwell scale

The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test measuring the depth of penetration of an indenter under a large load compared to the penetration made by a preload. There are different scales, denoted by a single letter, that use different loads or indenters. The result is a dimensionless number noted as HRA, HRB, HRC, etc., where the last letter is the respective Rockwell scale . When testing metals, indentation hardness correlates linearly with tensile strength.

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Body armor historical protective clothing; armor worn on the body

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Dragon Skin

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References

  1. "Bullet Resistance". SITEC. Retrieved 2009-02-14.
  2. Watney, Jeremy (2000). "BS EN1063 2000". Ballistic Edge Research Laboratory Mechanical Impact Testing. Retrieved 2009-02-14.
  3. "Levels of Protection According EN 1063" (PDF). MARS Armor. Archived from the original (PDF) on August 20, 2008. Retrieved 2009-02-14.