Origin Glass

Glass

On request Origin can supply glass to a wide range of specifications and thicknesses. This can be used for the entire range of balustrades that we supply.

There are a number of different types of glass. In helping you to choose the most appropriate glass for your application, there follows a basic introduction to the main types of glass. Advice should always be sort from a structural engineer if you are in doubt as to which type of glass to use for your application. 

Annealed glass

This is ordinary glass used in many applications. It is a basic glass product that is processed into laminated and toughened safety glasses. It is not a safety glass and if broken will form a limited number of large pieces with potentially dangerous edges. It is commonly used for all types of vertical glazing in non critical areas. It is not usually appropriate for balustrade.

Toughened safety glass

This is annealed glass that has been heat treated after all cutting and other work has been completed. Toughened glass is four to five times stronger than annealed glass of the same thickness. It is not unbreakable. 

Its increased strength enables it to be supported by two or even one edge and allows the safe use of glass in ways not possible with other glass types. Its use as a balustrade must be subject to careful consideration. If broken, the glass will shatter into small relatively harmless pieces.

Heat-soak testing

This is a destructive test for the presence nickel sulphide solutions. It involves placing the toughened glass in an oven and heating it to a temperature of 290 degrees centigrade. The glass is kept at this temperature for a period of time long enough to fracture a large proportion of any panes that otherwise might fail in service.

Heat soak testing achieves a conversion rate of 90% to 95%. Heat soaking will not detect other inclusions such as silica that can also cause breakage. Heat-soak testing is not a requirement of any British Standard but is recommended for safety critical work. This includes balustrades that prevent people falling. 

Heat strengthened glass

This is annealed glass that is heat treated by raising its temperature to approximately 700 degrees centigrade and then cooling it more slowly than toughened glass. It is not a safety glass and breaks in a similar way to ordinary annealed glass. The process adds strength (twice that of annealed glass) and thermal safety. 


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Unit 7 Parkside Industrial Estate, Glover Way, Leeds LS11 5JP
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