Glass balustrades vs. plastics
Toughened glass is used as safety glass in places like low level glazing, glazing in and around doors, overhead and in large areas of glazing to prevent injury following accidental glass breakage.
Toughened glass It is up to five times as strong as ordinary glass which means that it has to be hit much harder in order to break; also when it does break it is into lots of small pieces which are much less dangerous.
Glass balustrades are a sleek, glamorous alternative to balustrades of more traditional materials, such as wood or stone. They can provide a light, airy feel to balconies, staircases, and even outdoor walkways. Balustrade construction must meet relevant regulations and standards. In the UK glass balustrading needs to be constructed of toughened glass sometimes known as tempered glass.
How is glass toughened
The technique used to create toughened glass involves heating glass objects to beyond the annealing point of 600 degrees centigrade (1112 degrees Fahrenheit). How far beyond determines the varying grades of "toughening" -- toughened glass can range from twice as strong as annealed glass to as much as six times the tensile strength. Once the glass is heated, the outside is rapidly cooled using air blowers, usually by jets of cool air. This method solidifies only the outside, leaving the interior molten and fluid. That's what creates the various layers within the glass. Much energy is locked in the glass and is what cause the glass to break into small fragments.
Because of its layering, the surface of toughened glass is more resistant to impact. The same thrown object that would create a single hole in a pane of annealed glass would likely bounce off a comparative pane of toughened glass. The downside is that because toughened glass has more unity in its tensile strength, it would be more likely to explode completely if enough force was applied. This is sometimes a security concern, since once a toughened glass pane is breached; there are no glass shards to discourage entry. Toughened glass is also more costly to produce, because of the extra step needed to cool the exterior. Curiously, it also has a softer surface that is more prone to scratches.
Physical Properties of toughened glass
Toughened glass is physically and thermally stronger than regular glass. The greater contraction of the inner layer during manufacturing induces compressive stresses in the surface of the glass balanced by tensile stresses in the body of the glass. It is this compressive stress that gives the toughened glass increased strength. This is because any surface flaws tend to be pressed closed by the retained compressive forces, while the core layer remains relatively free of the defects which could cause a crack to begin. However, the toughened glass surface is not as hard as annealed glass and is therefore somewhat more susceptible to scratching. To prevent this, toughened glass manufacturers may apply various coatings and/or laminates to the surface of the glass.
Polycarbonate sheeting is a type of building material used to replace glass in a variety of applications. Made from thermoplastic composites, polycarbonate sheeting typically offers greater flexibility and shatter-resistance than acrylics or plexiglass. It comes in sheets that can vary in thickness from 2mm to several cm thick.
This material may be used as an alternative to glass in doors and windows. It is also popular for shower and pool enclosures, as well as on balconies and in greenhouses. Polycarbonate sheets may be found in sporting areas, where it is used to protect spectators from flying balls or hockey pucks and also used to make compact discs and eyeglass lenses.
Polycarbonate sheeting provides a great deal of options to installers and designers in terms of how it can be used. It can be held in place using screws, and may be used with speciality support poles designed to hold larger sheets. It can also be joined to other materials using epoxy or silicone, and can even be welded. Silicone sealant is often used to seal or caulk polycarbonate sheeting along its seams or joints.
One of the primary advantages of this type of sheeting is its high strength to weight ratio. Compared to glass, polycarbonate sheeting is very light, but also highly resistant to shattering and damage. This shatter resistance makes this material much safer than glass. Polycarbonate sheeting also acts as a sound barrier, and may help control UV-light infiltration. It also offers a high degree of flexibility, making it easy to form each sheet into the desired shape.
Visibility and light transmittance
Compared to some other composite plastic sheeting products, polycarbonate sheeting tends to be fairly expensive. It may also be susceptible to damage or failure if exposed to high temperatures. Like other plastic sheet goods, polycarbonate sheeting may suffer surface scratches due to a variety of factors. These scratches can be removed using special polishes or cleaning products, though some may be permanent. Over time, excess scratching can cause the surface to appear dull, and may reduce visibility and light transmittance.
For use in applications exposed to weathering or UV-radiation, a special surface treatment is needed. This either can be a coating (e.g. for improved abrasion resistance), or a coextrusion for enhanced weathering resistance. Co-extrusion is the extrusion of multiple layers of material simultaneously. But continuous exposure to sun and weather environment makes it less suitable for architectural usage in buildings, balconies and balustrading due to the fact of clouding, susceptibility to scratching and general weathering in time. These effects cannot be rectified and the only solution is replacement.
An additional factor when considering using polycarbonate as a balustrade infill panel is the cost. On average 10mm polycarbonate will cost three times as much as 10mm toughened glass, this factor is probably the most influential on choice of material. However when comparing this to 10mm curved toughened glass the costs can even out as polycarbonate can be manually “bent” on site to most radii and will not need to undergo a specific bending process.
Compared to toughened glass, the Tensile Strength is similar.
Whereas the Tensile Modulus is about a third of that which toughened glass possesses.
Polycarbonates are extensively used in bottling, medical, eyeglass applications and in the environment it poses huge problems when bottles are discarded randomly and the material not being bio-degradable thus creating problems of litter and general untidiness in towns and cities. Although it is used as a substitute for glass there are many aspects that make it unpopular and for balconies and balustrading is not a substitute for toughened glass. The ability to add hydrophobic coatings to toughened glass make this material an even more appropriate solution; not only in improving looks by keeping glass clean without any intervention, but also because fewer detergents and cleaning chemical residues enter the ecosystem.
Toughened glass is an ideal material for use in decorative and practical architecture on interior and exterior applications. It is easy to clean, hard wearing, long lasting and fulfils the need for giving a house or building a light bright airy feeling which is in demand today.
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