Bullet Resistant Glass

Thickness

Thickness: Varies based on protection level, usually ranging from 20 mm to 75 mm (0.78 to 3 inches).

Over the last few centuries, mirrors have become one of the most important parts of a home. They are essential furnishings and often create focal points. And people get plenty of use out of mirrors – a British study in 2015 showed men checking their appearance in a mirror an average of 23 times a day and women 16 times. Perhaps some of us will be surprised that men look in mirrors more often than women, but we at Jaipur Tuff realize that men often have to look themselves in the mirror and say “what have I done” when they get in trouble with their spouse!

What else makes an antique mirror?

Modern sheet glass is free of bubbling and is smooth. Manufacturing techniques in present day are able to pull this off in a way previous techniques could not.
The reflective coating used on the back of the glass is what turns a piece of glass into a mirror. The materials used here have changed over the years. In the 16th century, mercury was spread over a layer of tin with glass placed atop it. As time went on, old mercury mirrors aged to create a sparkly effect.
The mirror coating on the back of an antique mirror tends to oxidize or tarnish over time, whether made with tin and mercury or a thin sheet of silver. Dark or blotchy spots become visible through the glass, defining it as an antique.
The frame can also indicate the status of an antique mirror. Are there signs of wear? Is a carved frame chipped? Is the back of the imrror attached with something other than modern Phillips-head screws? What does the maker’s tag or mark on the back, if any, say?

Protection Levels (Standards-Based)

BRG is categorized based on its ability to withstand different types of firearms and bullets, as defined by international standards:

a. UL 752 (Underwriters Laboratories) Standards

Level 1: Protection against small arms like 9mm handguns and .38 Special rounds.
Level 2: Protection against higher-velocity handguns like .357 Magnum.
Level 3: Protection against high-power handguns like .44 Magnum.
Level 4: Protection against rifles like .30-06 armor-piercing rounds.
Levels 5 to 8: Protection against multiple higher-caliber and armor-piercing rifle rounds.
Levels 9 & 10: Protect against military-grade rifles like 7.62mm NATO.

Here’s the Weapons, Ammunition, and Performance Specifications:

Rating	Weapon	Ammunition	Weight (grains)	Weight (grams)	Minimum FPS	Maximum FPS	No. of Shots
Level 1	Beretta 92 Compact	9mm Full Metal Copper Jacket with Lead Core	124	8.0	1175	1293	3
Level 2	S&W Model 686	.357 Magnum Jacketed Lead Soft Point	158	10.2	1250	1375	3
Level 3	Colt Anaconda	.44 Magnum Lead Semi-Wadcutter Gas Checked	240	15.6	1350	1485	3
Level 4	Ruger American	.30 Caliber Rifle Lead Core Soft Point (.30-06 caliber)	180	11.7	2540	2794	1
Level 5	Springfield Armory M14	7.62mm Rifle Lead Core, Full Metal Copper Jacket Military Ball (.308 caliber)	150	9.7	2750	3025	1
Level 6	Uzi Submachine Gun	9mm Full Metal Copper Jacket with Lead Core	124	8.0	1400	1540	5
Level 7	Colt AR15	5.56mm Rifle Full Metal Copper Jacket with Lead Core	55	3.56	3080	3383	5
Level 8	Springfield Armory M14	7.62mm Rifle Lead Core, Full Metal Copper Jacket Military Ball (.308 caliber)	150	9.7	2750	3025	5
Level 9	M1 Garand	.30 Caliber .30-06 Armor Piercing Full Metal Copper Jacket	166	10.8	2715	2987	1
Level 10	Barrett 82A1	.50 Caliber Rifle Lead Core Full Metal Copper Jacket, Military Ball (M2)	709.5	45.9	2810	3091	1
Shotgun	Benelli M2	12-Gauge Rifled Lead Slug / 12-Gauge 00 Buckshot (12 pellets)	1.0 oz. / 1.5 oz.	28.3 / 42.0	1585 / 1200	1744 / 1320	3

b. EN 1063 (European Ballistic Standard)

BR1 to BR7: Based on ballistic threats from handguns and rifles, where BR1 is for small caliber handguns, and BR7 is for high-caliber rifles.
SG1 and SG2: Protection against shotguns.

c. NIJ (National Institute of Justice) Standard 0108.01

Level I, IIA, II, IIIA: Protection from handguns of different calibers.
Level III and IV: Protection from high-powered rifles and armor-piercing rounds.

Armor Type	Test Ammunition	Required Hits Per Specimen
I	LRHV Lead .38 Special RN Lead	5
II-A	.357 Magnum JSP	5
II-A	9mm FMJ	5
II	.357 Magnum JSP (higher velocity round)	5
II	9mm FMJ (higher velocity round)	5
III-A	.44 Magnum, Lead SWC Gas Checked	5
III-A	9mm FMJ	5
III	7.62mm, .308 Winchester FMJ	5
IV	.30-06 AP	1

Key Abbreviations:

AP: Armor Piercing
LRHV: Long Rifle High Velocity
FMJ: Full Metal Jacket
RN: Round Nose
JSP: Jacketed Soft Point
SWC: Semi-Wadcutter

Types of BRG

Different types of BRG are made from various materials and combinations of materials to achieve specific protection levels:

a. Acrylic Glass

A lightweight, single-layer solution.
Effective against small arms like handguns.
Used in low-threat environments (banks, kiosks).

b. Polycarbonate Glass

Multi-layered composite with polycarbonate sandwiched between layers of glass.
Higher impact resistance than acrylic.
Common for moderate threat protection (retail stores, government offices).

c. Glass-Clad Polycarbonate

Layers of laminated glass and polycarbonate.
Provides superior ballistic protection while maintaining transparency.
Used in high-security applications (military facilities, armored vehicles).

d. Laminated Glass

Multiple layers of glass bonded with a thermoplastic interlayer (often PVB or SGP).
Provides resistance to bullets as well as forced entry.
Often used in combination with polycarbonate for higher protection levels.

Application wise BRG

BRG can be classified based on where it is used and the specific security needs of the application:

a. Architectural BRG

Used in buildings for security purposes.
Includes installations in government buildings, banks, retail stores, schools, and airports.
Usually designed to be both bullet-resistant and aesthetically integrated into the structure.

b. Vehicle BRG

Installed in armored vehicles, including military, government, and VIP vehicles.
Lightweight versions of BRG designed for mobility.
Often includes spall protection to prevent the release of glass fragments inside the vehicle.

c. Residential BRG

Used in private homes and properties where enhanced security is required.
Often lower levels of protection (handguns, small arms) compared to government and military applications.

d. Specialty BRG

Fire-Resistant Bulletproof Glass: Combines bullet resistance with fireproof properties.
Explosion-Resistant Glass: Provides protection from both ballistic threats and explosive impacts.
Soundproof Bulletproof Glass: Designed for sound insulation alongside bullet resistance, often used in secure meeting rooms or embassies.

Special Types of BRG

BRG can also be differentiated by additional functional features or enhancements:

a. Spall Protection

Prevents glass fragments from spalling or detaching inside the building or vehicle when impacted by bullets.
Essential in high-security applications like military vehicles and government facilities.

b. Curved Bulletproof Glass

Used for aesthetic and functional purposes in vehicles and buildings.
Allows for unique architectural designs while maintaining ballistic protection.

c. Switchable BRG

Glass that can switch from transparent to opaque while maintaining bulletproof properties.
Used in places requiring privacy as well as security, such as conference rooms or luxury vehicles.

d. Insulated Bulletproof Glass

Combines the insulating properties of regular double-glazed glass with ballistic resistance.
Used in cold climates where temperature control is important alongside security, such as embassies and high-security residences.

Bullet Resistant Glass