Burglars, bombs and bullets are no match for laminated glass made with Saflex® interlayer
The desire for living and working in open, sunlit, glass-clad buildings has come face-to-face with the need to assure that building structures provide occupants with optimal security. Properly designed and installed laminated glazing systems made with Saflex® interlayer can provide remarkable protection from forced entry, bomb blasts and ballistics.
Designing for personal and facility security
Products constructed from laminated glass are referred to as security glazing and are designed to withstand the complex dynamic structural loads resulting from intentional impact or assault. Since burglaries, forced entries or ballistic attacks are often targeted toward the easiest opportunity and lowest perceived risk, the presence of laminated security glazing made with Saflex interlayer may be enough to thwart an attack.
Laminated architectural glazing made with Saflex interlayer provides a significant improvement over monolithic glass products in resistance to forced entry and is capable of passing Underwriters Laboratory Burglary Resistance Test UL 972, ASTM F1233 Standard Test Method for Security Glazing Materials and Systems and EU norms.
Within the glazing industry, security design generally falls into three broad categories: burglary / forced entry, bomb blast, and ballistics. Each category requires special design criteria for glazing systems as detailed below.
Burglary and Forced Entry and Forced Exit Resistance
In designing to resist burglary or forced entry, the entire glazing system – not just the glass panel – must be designed to withstand an attack. In institutional settings, laminated glass can provide the needed time delay to allow added security or authorized personnel to arrive on scene and adequately address a situation without creating potential danger for other inmates or clients. Generally, security products with the greatest overall thickness and the largest percentage of Saflex® or Vanceva® protective interlayer deliver the best resistance to forced entry as required by the American Society for Testing and Materials class rating ASTM F12233 Class I, II and III.
Typically, laminated glass made with Saflex protective interlayer is strong enough to deter and discourage an opportunistic, "smash-and-grab" burglar. Since laminated glass cannot be cut from only one side, even quiet glass cutters become a useless burglary tool. Standard laminated glass made with 1.52 mm thick (0.060 inch) interlayer provides significantly improved resistance to attack from handheld weapons compared to ordinary monolithic glass products – even those that are strengthened.
Bomb Blast Resistance
According to experts, approximately 75% of all damage and non-fatal injuries from bomb blasts can be attributed to flying and falling glass related to an explosion. Laminated glass made with Saflex interlayer can significantly:
- Withstand both the initial blast wave from the explosive event as well as debris that may impact the glazing
- Reduce or eliminate flying glass to assure protection of nearby non-targeted buildings
- Reduce injury and cost to repair the targeted and surrounding facilities Reduce the extent of damage and opportunity for looting
Since each design project is unique, the level of protection is a determination that must be made by the building owner. The amount of desired protection, followed by balancing the acceptable risk, must be determined prior to designing the glazing systems. Recently developed glazing and framing techniques combined with the long life cycle of laminated glass, allow the use of more glass in buildings without sacrificing comfort or protection.
Security glazing using laminated glass made with Saflex protective interlayer substantially reduces injury, decreases the extent of damage and the cost to repair targeted and surrounding facilities, and reduces the opportunity for looting. Laminated glass is the only security glazing tested that satisfies all relevant performance standards for safety and security applications.
Ballistic (bullet) Protection
Handguns and even more powerful ballistic weapons are being used in many armed robberies and assaults. These readily available weapons account for increasing human injury and death rates from street crimes and organized terrorist attacks. Security glazing, consisting of the appropriate configuration of laminated glass, can reduce injury from a ballistic attack while not compromising the clear vision benefits afforded by a glass system.
Bullet-resistant glass is produced by alternating layers of glass and Saflex protective interlayer to form a multiply construction which is bonded in an autoclave to form a single laminated unit. Bullet-resistant glazing is tested in accordance with either the method described in ASTM F1233 or the requirements of Underwriter's Laboratories Inc. Test UL 752 (13).
Designing for Security in Residential Applications
Window and door systems made with Saflex® interlayer are unique products that meet a range of home safety and security standards. Made with a tough protective interlayer laminated between two sheets of glass, these window and door systems even stand up to repeated blows from bricks, bats, hammers and crowbars. Plus, they filter out up to 99% of UV rays* that can contribute to the fading and degradation of home furnishings. They also can reduce the perception of irritating outside noise up to 50% more than ordinary window glass.
*Up to 380 nanometers
For more information on Saflex or Vanceva interlayer, contact us.
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