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MONTAGUE GARDENS TEL: 021 552 4181
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ALL GLASS WYNBERG TEL: 021 552 4196
All Glass offers windows repairs in Cape Town 24/7/365.
Breakages happen. Minimise the inconvenience caused by this and take advantage of the professional glass replacement services offered by the All Glass glaziers to quickly and effectively replace or upgrade the window glass of your building or home. We have a selection of glass solutions that perform a wide variety of functions, making All Glass your all-in-one home/building glass replacement solution.
Many clients ask the difference between the types of safety glass offered. The easiest explanation is in your motor. Your front windshield is laminated safety glass, whereby stones and projectiles cant come through. When damaged the film “holds” the glass together. The glass in your side doors are toughened which have more strength from a front impact but if hit hard enough will shatter into little pieces. This is toughened or tempered glass. Please find below a more in-depth description.
Laminated glass is a type of safety glass that holds together when shattered. In the event of breakage, it is held in place by an inter-layer, typically of PVB, between its two or more layers of glass. The inter-layer keeps the layers of glass bonded even when broken, and its high strength prevents the glass from breaking up into large sharp pieces. This produces a characteristic “spider web” cracking pattern when the impact is not enough to completely pierce the glass.
Laminated glass is normally used when there is a possibility of human impact or where the glass could fall if shattered. Shopfront glazing and windshields are typically laminated glasses. The PVB inter-layer also gives the glass a much higher sound insulation rating, due to the damping effect, and also blocks 99% of transmitted UV light. Using toughened glass on windshields would be a problem when a small stone hits the windshield at speed, as it would shatter into the small squares making visibility difficult and it would also be likely that the wind would blow the small squares into the driver and passengers.
A typical laminated makeup would be 3 mm glass / 0.38 mm inter-layer / 3 mm glass. This gives a final product that would be referred to as 6.38 laminated glass.
Toughened glass or tempered glass is a type of glass that has increased strength and will usually shatter into small fragments when broken.
All of our glass and mirrors can be polished with state of the art polishing equipment from Italy to give that bright, quality finish.
Toughened glass is used when strength, thermal resistance and safety are important considerations, such as in display-case windows, shower doors and glass patio doors. In commercial structures, tempered glass is used for unframed assemblies such as frameless doors, structurally loaded applications and any that would be dangerous in the case of a human impact.
Toughened glass is made from annealed glass via a thermal tempering process. The glass is placed onto a roller table, taking it through a furnace that heats it to above its annealing point of 600°C. The glass is then rapidly cooled with forced drafts of air while the inner portion of the glass remains free to flow for a short time.
The term toughened glass can be misleading. The term is generally used to describe fully tempered glass but is sometimes used to describe heat strengthened glass as both types of glasses undergo a thermal ‘toughening’ process.
There are two main types of heat treated glass: heat strengthened and fully tempered. Heat strengthened glass is twice as strong as annealed glass whilst fully tempered glass is typically four to six times the strength of annealed glass. The difference is the residual stress in the edge and glass surface.
It is important to note that the strength of the glass does not change the deflection – being stronger means that it can deflect more before breaking. Annealed glass and fully tempered glass will deflect the same amount for the same load.
Toughened glass must be cut to size or pressed to shape before toughening and cannot be re-worked once toughened. Polishing the edges or drilling holes in the glass is carried out before the toughening process starts. Due to the balanced stresses in the glass, damage to the glass will eventually result in the glass shattering into thumbnail sized pieces. The glass is most susceptible to breakage due to damage to the edge of the glass where the tensile stress is the greatest. However, shattering can also occur in the event of a hard impact in the middle of the glass pane or if the impact is concentrated (for example, striking the glass with a point). Using toughened glass can pose a security risk in some situations due to the tendency the glass has to shatter completely upon hard impact.