PROTECTION IN OUR DAY TODAY SCENERIO
S.K.ANSARI & SEEMA ANSARI
Aug 20 - Sep 2, 2012
Now Pakistan becomes the country which really need our protection wherever we can. Not only in Pakistan but all the country in the world need some protection of their lives. Many companies are also involving to work on these development of material. Polycarbonate is a material which has been using for a long time but comparatively it is expensive and heavy in weight is becoming out dated material. In place of polycarbonate acrylic material with three level of mechanism shows for different protection according to the requirements.
THERE IS NO SUCH A THING AS BULLETPROOF GLASS
In movies and TV shows, bulletproof glass is often depicted to be indestructible. No matter what weapon is used, no matter how many bullets are fired, bulletproof glass remains intact and unchanged. The only problem is, in real life, bulletproof glass isn't really bulletproof and it isn't really glass.
The correct term for "bulletproof" glass is bullet resistant. Why? Because with enough time and concentrated effort or just a big enough caliber bullet, a person can become victorious over the suppose indestructibility of "bulletproof" glass. The strength and durability of bullet-resistant glass depends on how it is made and the thickness of the final product.
Fire a bullet at a normal sheet of glass and the glass will shatter, right? So, how exactly does glass become bullet resistant? There are three main kinds of bullet-resistant glass:
1) Acrylic: Acrylic is a hard, clear plastic that resembles glass. A single piece of acrylic with a thickness over one inch is considered bullet resistant. The advantage of acrylic is that it is stronger than glass, more impact resistant, and weighs 50 percent less than glass. Although acrylic can be used to create bullet-resistant glass, there is no actual glass in the final product.
2) Polycarbonate: Polycarbonate is also a type of plastic, but it differs from acrylic in many ways.
Polycarbonate is a versatile, soft plastic with unbeatable strength. It is a third of the weight of acrylic and a sixth of the weight of glass, making it easier to work with, especially when dealing with thickness.
Polycarbonate is combined in layers to create a bullet resistant product. Whereas, acrylic repels bullets, polycarbonate catches the bullet and absorbs its energy, preventing it from exiting out the other side.
Polycarbonate is more expensive than other types of materials, including glass and acrylic, so it is often used in combination with other materials for bullet-resistant glass.
3) Glass-Clad Polycarbonate Bullet-Resistant Glass: This type of bullet-resistant glass uses a combination of materials to create the desired result. We are all familiar with the process of lamination. It is what teachers do to paper to protect it from the unidentifiable substances of kids' fingers so it will last longer. Manufacturers of glass-clad polycarbonate bullet-resistant glass use the same process. A piece of polycarbonate material is laminated, or sandwiched, between ordinary sheets of glass and then it undergoes a heating and cooling process to mold the materials together into one piece. The end result is a product that resembles glass but is thicker and more durable.
Thickness plays a huge part in a product's ability to resist bullets. Bullet-resistant glass is designed to remain intact for one bullet or one round of bullets. Depending on the force of the bullet being fired and what type of weapon is used, a thicker piece of bullet-resistant glass is needed to stop a bullet with more force. For instance, a shot fired from a 9mm pistol is less powerful than one fired from a rifle. Therefore, the required thickness of bullet-resistant glass for a 9mm pistol is less than is needed for a rifle. The final thickness of bullet-resistant glass usually ranges from about .25 inches to 3 inches.
The latest and greatest design for bullet-resistant glass is one-way bullet-resistant glass. Yes, it is exactly what is sounds like. One-way bullet-resistant glass consists of two layers-brittle glass and a flexible material such as the polycarbonate plastic material described above. When a bullet hits the brittle glass layer first, the glass breaks inward toward the plastic, which absorbs some of the bullet's energy and spreads it over a larger area so the polycarbonate material is able to stop the bullet from exiting. When a fired bullet hits the polycarbonate material first, the bulk of the force is concentrated on a small area that prevents much energy from being absorbed. Then, since the glass material breaks outward away from the polycarbonate, the bullet maintains enough energy to break through the glass and travel toward its destination. One-way bullet-resistant glass is most ideal for armored vehicles.
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WHAT ARE THE BULLET RESISTANT MATERIAL
Bullet-resistant materials are commonly used where the threat of attack by an armed criminal is likely. While the level of security risk at most facilities doesn't warrant the use of such materials, some facilities, due to the nature of their operation or their location, do find the use of bullet-resistant materials to be a necessary security precaution.
Bullet-resistant materials can both protect employees as well as discourage robbery attempts and other types of crimes involving the use of a firearm. Bullet-resistant materials are commonly used at banks, pharmacies, check cashing centres, and other businesses that handle cash or narcotics in high-risk neighbourhoods. Bullet-resistant materials are also used at public facilities such as police stations, jails and courthouses.
In recent years, certain types of facilities that didn't previously use bullet-resistant materials are now using them. For example, hospitals in high-crime areas now use bullet-resistant materials on the exterior of their Emergency Departments to protect against gang-related drive-by shootings. Also, some data centres now install bullet-resistant materials in their lobbies to prevent forced takeover of the facility by armed attackers.
TYPE OF BULLET-RESISTANT MATERIALS
There are four main categories of bullet-resistant materials: bullet-resistant glazing, bullet-resistant panels, bullet-resistant doors, and bullet-resistant accessories.
Bullet-resistant glazing is probably the best known type of bullet-resistant material. Bullet-resistant glazing is used when ballistic protection is needed, but direct visual contact is also required between the protected area and the non-protected area. Bullet-resistant glazing is commonly used at bank teller cages and other types of service counters, providing protection between the public area and the area that contains the cash or other valuables. Bullet-resistant glazing is also used on the interior of lobbies, providing separation between the public and non-public side of the lobby. In addition, bullet-resistant glazing is sometimes used on the exterior of the building to protect against stray gunfire or attacks from a sniper.
There are four commonly used types of bullet-resistant glazing, each with their own advantages and disadvantages. The following is an overview of each type of material:
* Consists of multiple layers of glass laminated with protective interlayer, usually polyvinyl butyral (PVB).
* Least expensive type of bullet-resistant glazing.
* Suitable for both indoor and outdoor use.
* Because it is glass, it can be broken, and does not provide protection against a sustained physical attack.
* Heaviest type of bullet-resistant glazing; weight may require special structural considerations.
* Suitable only for indoor use.
* One-half the weight of glass.
* Scratches relatively easily unless provided with special coating.
* Available only in lower ballistic ratings.
* Offers some degree of protection against physical attack.
* Suitable only for indoor use.
* Weighs less than glass.
* Best ability to fully capture incoming bullet, prevents ricochets and spalling.
* Offers protection against physical attack.
* Has slight greyish tint; not as clear as glass or acrylic.
* Scratches relatively easily.
* Costs more than laminated glass.
* Consists of polycarbonate with a layer of glass added to it.
* Suitable for indoor and outdoor use.
* Glass side resists scratching and provides weather-resistance.
* Weighs less than glass.
* Offers protection against physical attack.
* Has slight greyish tint; not as clear as glass or acrylic.
* Costs more than laminated glass.
Bullet-resistant panels are most commonly used to protect the walls surrounding the openings where bullet-resistant glazing is used. For example, if bullet-resistant glazing was used at a customer service window in a pharmacy, bullet-resistant panels would be used in the wall on both sides of the window as well as below and above the window itself.
The use of bullet-resistant panels allows walls to be constructed using standard stud-wall construction techniques rather than requiring that a concrete or masonry wall be provided. Bullet-resistant panels are typically fastened to the studs and then covered with regular drywall. When painted, the bullet-resistant wall looks like any other.
There are two popular types of bullet-resistant wall panels: steel, and fiberglass composite. Steel wall panels are the least expensive but weigh more. Steel wall panels are difficult to work with on the job site and usually must be ordered from the factory in the desired size. Fiberglass composite wall panels cost more than steel wall panels but weigh about half as much. Fiberglass composite panels are much easier to work with and can be cut and drilled on the job site.
Bullet-resistant doors are used when a door is required in a wall that forms part of a bullet-resistant barrier. Bullet-resistant doors are specifically designed to provide ballistic protection and usually come as a complete unit consisting of both door and door frame. Bullet-resistant doors come in both wood and metal versions and are available with or without windows.
Bullet-resistant accessories are used when it is necessary to pass objects through a bullet-resistant barrier. Bullet-resistant accessories are also used to allow direct audio communications between both sides of the barrier. Bullet-resistant accessories include speak-through devices, money trays, gun ports, and package receivers that allow packages of various sizes to be passed through the barrier.
Bullet-resistant materials are sometimes incorrectly called "bullet-proof" materials. Most of these materials are in fact not bullet-proof, but only provide protection against a certain range of types of firearms for a certain period of time.
Firearms are available in a wide variety of calibers, each which have a different ability to penetrate a bullet-resistant material. Even within cartridges of the same caliber, there are different bullet weights and types and different powder loadings. Rifle cartridges generally have much more power than handgun cartridges, and shotguns may pose a different type of threat than either handguns or rifles. Repeated gunfire against the same surface also has a different effect than a single bullet does.
To help sort through all of these variables, Underwriters Laboratories (UL) has developed a written standard, UL 752, that establishes ratings for bullet-resistant materials. UL 752 specifies eight levels of bullet-resistant ability, ranging from Level 1 to Level 8. The most common ratings used by commercial businesses are:
* Level 1 - Provides protection against 9mm and less powerful handgun cartridges.
* Level 2 - Provides protection against .357 magnum and less powerful handgun cartridges.
* Level 3 - Provide protection against .44 magnum and less powerful handgun cartridges.
Level 4, 5, 7, and 8 are generally needed to provide protection against common rifle cartridge calibers. UL 752 also has supplementary ratings for threats from a shotgun.
In general, the higher the rating level, the better the protection, but the greater the cost. Higher rated materials are also generally thicker and weigh more, and there may be a limited availability of materials and accessories at the higher rating levels.
STEEL VS. BULLET PROOF ACRYLIC UL 752 PANELS
When it comes to bullet proofing a wall, there are essentially two options: steel or bullet proof Kevlar panels. At first glance, steel-strong, reliable, and relatively cheap-seems like a good investment, but let the buyer beware: you get what you pay for.
IN THE BEGINNING THERE WAS STEEL
Steel has a long history of stopping flying bits of lead, and certainly seems like the cheapest option. But as anyone who's ever bought the "cheapest" laptop knows, a low sticker price can translate to mounting costs over time.
In the case of using stainless or armor plate steel in a modern bullet proof system, what you save in dollars ends up costing you in installation costs. Stainless steel just a few millimeters thick (the minimum thickness suitable for stopping modern bullets) weighs roughly two pounds per square foot. In other words, bullet proofing a short run of wall along your reception area will take about 130 pounds of steel. You can't just tack that up on a standard stud wall-the steel outweighs the wall itself by 50 percent or more. In addition to having to reinforce your wall, sheet steel can't be worked on site with standard hand tools. Each sheet needs to be cut precisely to size at the factory and pre-drilled with all of the necessary mounting holes prior to shipping; if a sheet arrives a quarter inch too long or missing a whole for a phone cord, the installation contractors can't just trim or drill it on the spot.
THE ADVANTAGE OF ACRYLIC UL 752 PANELS
Acrylic UL 752 is a hybrid material composed of a flexible matrix soaked in a liquid resin, which is then pressed and baked to make a hard and durable component piece. Since it's so easy to engineer and integrate into designs, Acrylic UL 752 is enormously popular in a wide range of fields, from boat design to building construction, military applications to aerospace technology. By using bullet proof Acrylic UL 752 as the underlying fiber matrix, fiberglass makers can craft panels of fiberglass that can stop bullets. Although this material is more expensive than steel, it introduces significant savings at the installation stage, because it's so much lighter (just half the weight of steel plate, meaning that walls seldom require reinforcement to accommodate bullet proof A pcrylic UL 752 panels) and easier to work. Contractors can trim, drill, and finish the panels on the job site using nothing more exotic than a standard hacksaw or power drill.
TOTAL SECURITY SOLUTIONS MANUFACTURING LEVEL 3 BULLET PROOF GLASS
Total Security Solutions, the leading manufacturer and installer of bullet proof glass, recently began offering National Institute of Justice-rated Level 3 glass for security purposes. this top-rated bullet resistant glass product offers added security for Total Security Solutions' retail, banking and government customers.
To pass the Level 3 test, bullet proof glass must stop a shot from a .30-06 hunting rifle. "Mostly institutional wants a product that meets their security and aesthetic needs. Acrylic UL 752 design for Level 3 protection in a custom product, such as a transaction window that includes a voice port.
Bulletproof glass is tested by firing a bullet from a set distance in a set pattern. Levels of protection are based on the glass' ability to stop a bullet traveling at a specific speed.
In the test environment, the sample is rigidly mounted 15 feet from the rifle muzzle with a 1/8î thick "witness plate" of corrugated cardboard positioned 18 inches behind it. No marking, or impressions are allowed on the witness plate to achieve a pass rating.
Level 4 bulletproof glass provides ideal security for military bases, port of entry checkpoints, government facilities, embassies, and police stations.
INDIA: BULLET RESISTANT WINDOW-WALLS
People are most surprised when Jim mentions doing business in India, because it is so well known as an outsourcing destination. For example, three years ago, following the Mumbai terrorist attacks of 2008 when Jim was contacted by an Indian importer in need of a bullet resistant window-wall system with a true Level 3 rated bullet resistant aluminum frame to be used in new construction. "Most construction materials are sourced locally in India" Jim notes, "but few countries in that region have advanced material industries with the kind of quality standards we have in the US."
Jim's experience in India is also indicative of the inherent contradictions of such a rapidly developing nation: the importers he deals with are not themselves designers, builders, contractors, or installers; they are businessmen drawing together collaborators from around the world to meet the demands of their surging economic development. Despite its struggles with desperate poverty, India has seen robust growth in their creative class: There are plenty of people there who can design beautiful and innovative Bullet proof windows and systems, there just aren't any factories up to the task of producing high enough quality components to make those designs a reality.
BULLET RESISTANT ACRYLIC UL-752 LEVEL 3
Bullet Resistant Acrylic UL-752 Level 3 are the ballistic protection and superior optical clarity against virtually all handguns, including those of super power, such as the .44 magnum.
An abrasion-resistant coating is standard and the sparkling clarity after machining and polishing outshines all products in its class. The unique design for Bullet Resistant Acrylic UL-752 Level 3 has proven to have ballistic protective capability which exceeds the criteria set forth in UL-752 Level 3 requirements.
BULLET RESISTANT MANTRAPS
Mantraps consist of a small space having two sets of interlocking doors such that the first set of doors must close before the second set opens and are usually utilized in banks, financial institutions, detention facilities, pawn shops and jewelry stores or may be in secured offices.
A mantrap can be configured so that when an alarm is activated, all doors lock and trap a suspect between the doors in the "dead-space" or lock just one door to deny access to a secure space such as a data center or research lab.
For applications where Mantraps are required, there are variety of Bullet Resistant Fiberglass Panels, Bullet Resistant Glass & Glazing and Bullet Resistant Doors, Frames & Hardware.
OTHER VARIETY OF BULLET RESISTANT SOLID CORE WOOD DOOR
There are other types of Bullet Resistant Solid Core Wood Door assembly for any commercial application.
The solid core wood door assemblies are custom built to the client's specified sizes and are shipped pre-hung to include a wood veneer or plastic laminate finish, ballistic capture frame, roton continuous hinge, door closer and specified hardware. At the core of our solid core wood doors and frames is a layer of our UL Listed Bullet Resistant Fiberglass, are design in UL 752 levels 1 - 8, which creates a superior bullet resistant door that sets us apart.
BULLET RESISTANT BUILDING REINFORCEMENT
Safety and security is of the utmost importance for your business, home or security structure for your selves and to protect your family, employees, property and assets. Bullet Resistant Building Reinforcement is typically installed during new construction, although just about any structure can be retrofitted and converted with very little effort.
Acrylic UL 752 can be used for newly construction building materials and products, including Bullet Resistant Fixed Windows & Ballistic Capture Frames, Bullet Resistant Fiberglass Panels, Bullet Resistant Doors, Frames & Hardware and Bullet Resistant Glass & Glazing for your Building Reinforcement applications.
SUGGESTIONS FOR USING BULLET-RESISTANT MATERIALS
1. The decision to use or not use bullet-resistant materials should only be made after a comprehensive security assessment has been conducted. The security assessment should provide guidance as to where bullet-resistant materials should be used, and establish the minimum UL rating level required based upon the level of risk at the specific facility.
2. A systems approach must be taken when designing a bullet-resistant barrier; the wall, glazing, and any accessories must all be rated to provide the minimum desired UL rating level. It doesn't make sense to provide a Level 3 rated window when the wall surrounding the window is unprotected. Also consider the possibility of ricochet and the potential for a bullet to penetrate the adjacent walls, ceilings, and floors.
3. Always use materials that are UL listed and labeled. Some manufacturers can be deceptive and use terms such as "tested to UL standards", "meets requirements of UL Level 3", etc. even though their products haven't actually been tested by UL.
4. The thickness and weight of bullet-resistant materials can have an impact on building construction and may affect everything from the size of the structural beams to the type of window coverings used. Be sure to involve your architect or other design professional in the planning of your bullet-resistant system.
5. Employee security awareness training must be provided in conjunction with the installation of a bullet-resistant barrier. Employees need to know how to react when a weapon is presented, even if they are behind a protective barrier. Employees may also be at increased risk when entering or leaving the protected area, and need to be given guidelines on how this can be accomplished safely.