WHAT IS LAMINATED GLASS.
Laminated glass is a sandwich made of one piece of plastic Poly Vinyl Butyral between two or more glass. The PVB sticks with the glass, forms chemical as well as mechanical bonds. When laminated IS COMBINED with annealed glass, the layer maintains the geometric integrity of the pane, in case of breakage.
Laminated glass gives ACCOUSTIC INSULATION as well as protection against damage caused due to UV radiation ait cuts almost 99% of UV radiation .
The PVB is always in the thickness of .38 mm and/or the multiples of .38 mm. So the basic nomenclature of laminated glass is X+Z + Y,where X & Y are the thickness of the 2 panes of glass the Z is the total thickness of the PVB.
LAMINATED GLASS FEATURES:
Ordinary window glass is brittle, breaking into long sharp pieces which can cause serious injuries. The principal feature of Laminated glass, is that the interlayer absorbs the energy impact and hence resists penetration. Although the glass may break, the glass fragments remain firmly bonded to the interlayer, minimizing the risk of injuries.
Burglars often try to break windows to get inside the house or a building and here the laminated glass plays an important role in resisting their intrusion. Even if the glass breaks, the interlayer continues to safeguard the building until the glass is replaced.
Noise gains easiest entry to homes and buildings through windows and doors. Laminated glass proves an excellent barrier to noise, has it has better Sound Transmission Loss as compared to glass of similar thickness in the frequency of 125 Hz to 4000 Hz. Also it eliminates the 'coincidence dip' that is associated with the 'single' glass because of the viscoelastic property of the interlayer material.
SOLAR ENERGY CONTROL
While natural light is important for us, too much sunlight can also mean too much HEAT GAIN inside the building, reducing energy efficient properties. Laminated glass ,when used in combination with reflective glass, tinted glass or low e glass, provides excellent reduction in the Solar Gains, as well as reduction of sound transmission through the window.
The major cause of deterioration and fading of furnishings and pictures is the chemical reaction caused by short-wavelength UV radiation. UV absorbing additives in the interlayer in laminated glass can screen out almost all of these damaging rays.
IMPACT RESISTANCE/HURRICANE PROTECTION
If broken, laminated glass remains in its frame, preventing interior damage while reducing flying glass protects people both indoors and outdoors.
In regions subjected to heavy winds and rain such as hurricanes or cyclones, buildings often need extra protection. Flying debris carried by these winds can shatter the glass and injure people. Laminated glass is designed to remain intact on impact and stay safely secured in it's frame.
LOW VISUAL DISTORTION
Laminated Glass is usually glazed in an annealed form, avoiding the distortion caused by roller waves in the tempered and heat strengthened glass resulting in laminated glass reflecting sharo images and fewer visual distortions.
SPECIFICATIONS OF ALCOR'S LAMINATED GLASS.
The PVB exhibits an extraordinary resistance in terms of UV transmission WITHOUT reducing visible light transmission is used with clear, grey or reflective float glass.
ALCOR'S LAMINATED GLASS/ PVB SPECS:
PVB thickness --0.76mm
PVB colors --Clear & Grey, (blue & green- customer order)
Glass Size - 6mm ( available in clear & grey) or reflective (custom order)
Refractive Index -- 1.48•
Visible Light Transmittance, Clear -- 89% •
Shading Coefficient, Clear -- 0.92 •
UV Screening, up to 380 nm -- 99% •
Tensile Strength -- 3220 psi •
Tensile Elongation -- 205% (JIS K6771) •
Specific Gravity -- 1.07 •
Specific Heat -- 0.47 Btu/lb°F •
Thermal Conductivity (K value) -- 0.12 Btu/(ft2hr°F) •
Coefficient of Thermal Expansion -- 2.6 x 10-4 in./in.°F • Emissivity -- 0.9