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Spontaneous glass breakage - Wikipedia
Spontaneous glass breakage is a phenomenon by which toughened glass (or tempered) may spontaneously break without any apparent reason. Common ... This type of breakage is almost always found in tempered glass and is indicated by a distinctive "figure eight" pattern, with each "loop" of the figure eight approximately 30 mm in diameter.
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What is Spontaneous Glass Breakage? - ARC Window Films
Spontaneous glass breakage is a phenomenon with toughened glazing whereby installed glass suddenly breaks, seemingly without cause. This can be a huge issue, especially if this occurs in overhead glazing or balustrades where people …
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Nickel Sulfide Inclusion and Spontaneous Glass Breakage
If all of the glass has fallen into a pile of rubble, it won't be easy. But if the broken glass cubes stayed in the opening, the overall breakage pattern can be seen. Look closely at the focal point of the break. Butterfly pattern. At the focal point of the spontaneous glass breakage, sometimes a …
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Spontaneous Window Glass Breakage NiS inclusions in ...
A discussion of spontaneous window glass breakage caused by to nickel sulfide (NiuS) inclusions contaminants in toughened glass. - spontaneous fracture of tempered glass. Abstract: A brief review of the magnitude of the nickel sulphide problem is discussed. The need for heat soaking of all tempered glass is questioned given that the total ...
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Diagnosing Glass Breakage • Chicago Window Expert
The pattern you see on the background of this page (scroll all the way down) is a clasic breakage pattern of tempered glass. I recently learned that it is possible for a lite of glass to be incompletely tempered, i.e. tempered in some areas and not fully tempered in other areas.
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Glass in Building and Nickel Sulphide
Toughened glass always displays a characteristic breakage pattern when it remains in place, which appears like the spokes of a bicycle wheel surrounding the hub, which is the origin of the fracture. Commonly there are two larger pieces of glass at the origin, sometimes called butterfly wings, cats eyes, figure of 8 or mickey mouse ears. This ...
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ADVANCED DESIGN OF GLASS STRUCTURES
• One reason for spontaneous breakage are small (50 µm to 500 µm diameter) that undergo a volume change. • The typical breakage pattern („butterfly") is one indication, but not a sufficient indication for NiS. • Today, the heat-soak-test is the most efficient measure to bring panes with inclusions to failure in advance. NiS inclusions
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Spontaneous breakages in toughened glass
Spontaneous breakages of toughened glass can occur for a variety of reasons: Impact from an object: often sharp, but the edge of a chair is not unusual. Glass in contact with an exposed fixing or metal glazing bead: this could be a structural bolt or even direct glazing without a gasket.
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Reducing the risk of spontaneous glass breakage - Glazing ...
The risk of a spontaneous breakage in thermally toughened glass that has been heat soak tested in accordance with BS EN 14179-1 is 1 in 400 tonnes of glass. Based on a typical size pane of glass in a double-glazed unit this equates to a risk of 0.015% or approximately 1 in 7,000 sealed units or 1 …
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Unexplained Glass Failure - Don't Jump To Inclusion ...
Even where a 'butterfly' failure pattern is observed – something commonly associated with a 'spontaneous' NiS failure – a NiS inclusion cannot be assumed. The three images below depict this same failure pattern, however, whilst one is due to a NiS inclusion the other two have resulted from a glassy inclusion within the glass and an ...
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(PDF) A case study of apparently spontaneous fracture
In 2015 several sliding thermally toughened glass single curved vehicle roof windows failed within several months. A butterfly pattern was seen and NiS failure was suspected by the window ...
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Toughened Glass | NorthGlass
Fully toughened glass with its unique breakage pattern also ensures that the glass meets industry relevant safety characteristics. NorthGlass Heat Soak provides a decreased risk of spontaneous breakage as it is heat-soak tested for nickel-sulfide inclusions in accordance with appropriate standards.
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The Glass 'Butterfly Effect' – Advice On The Risk Of Glass ...
Failure of glass due to the presence of nickel sulphide inclusions is an issue gaining notoriety with the construction industry, affecting developers, contractors and insurers alike. Due to its failure mechanism and subsequent breakage pattern, toughened glass suffers a substantial loss of structural integrity post fracture.
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Spontaneous Glass Breakage: Why it happens and what we do ...
While toughened glass is four to five times stronger than standard glass, there are instances when spontaneous glass breakage occurs. While this phenomenon is uncommon, we thought we would tell you a little bit more about what it is, why it happens can be done to limit the chances of it happening.
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Spontaneous breakages in toughened glass - SpecFinish …
Spontaneous breakages of toughened glass can occur for a variety of reasons: Impact from an object: often sharp, but the edge of a chair is not unusual. Glass in contact with an exposed fixing or metal glazing bead: this could be a structural bolt or even direct glazing without a gasket. Damaged or shelled edge: often caused after toughening ...
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Spontaneous glass breakage - Wiki
The risk of a spontaneous breakage in thermally toughened glass that has been heat soak tested in accordance with BS EN 14179-1 is 1 in 400 tonnes of glass. Based on a typical size pane of glass in a double-glazed unit this equates to a risk of 0.015% or approximately 1 in 7,000 sealed units or 1 …
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Bannermans Lawyers - Exploding Glass Panels – Building Defects
The crack pattern is distinctive because it starts with a tiny butterfly shaped crack at the position of the nickel sulphide particle and quickly radiates out from that fracture. The process of heat soaking of toughened glass was originally developed by the industry in the 1960's in an attempt to minimise the risk of spontaneous fractures in ...
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Spontaneous Breakage of Thermally Toughened Glass
Spontaneous Breakage of Thermally Toughened Glass Thermally toughened soda lime silicate glass was first manufactured in 1931. Since that time breakages of thermally toughened glass have occurred. It was in 1961 that E R Ballantyne issued a report on the breakage of thermally toughened cladding panels from a building in Melbourne, Australia1 ...
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Spontaneous Glass Breakage - Tempered Glass Break …
Nickel sulphide inclusions breakages are often characterised by a distinctive pattern that resembles a butterfly or figure of eight. How to Prevent Spontaneous Glass Breakage . Toughened Glass. Using toughened glass in a glazing system reduces the risk of spontaneous glass breakage from thermal shock. The rapid heating and cooling process ...
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Spontaneous glass breakage | Prism Glass Blog
What can cause spontaneous glass breakage? Damaged glass edges While glass is being handled, packaged, shipped, or installed onsite, a glass edge may be nicked or chipped.The damage may not be visible, maybe even hidden inside the glazing track. While no immediate breakage occurs, over time as the glass expands and contracts, stress concentration can build up around these …
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Toughened Glass - AFHH
temperature form until some years later when its transformation breaks the glass. A characteristic "spontaneous" fracture pattern in a toughened glass window. The nickel sulphide inclusion is found at the initiation of failure (at the centre of the butterfly pattern, arrowed)
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Causes of Spontaneous Glass Breakage and How to Prevent It ...
Nickel sulphide inclusions breakages are often characterised by a distinctive pattern that resembles a butterfly or figure of eight. How to Prevent Spontaneous Glass Breakage . Toughened Glass. Using toughened glass in a glazing system reduces the risk of spontaneous glass breakage from thermal shock. The rapid heating and cooling process ...
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Toughened glass
A characteristic "spontaneous" fracture pattern in a toughened glass window. The nickel sulphide inclusion is found at the initiation of failure (at the centre of the butterfly pattern, arrowed) The manufacture of toughened glass and generation of unstable nickel sulphide Flat glass is toughened in an oven that resembles a giant toaster.
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Reducing the risk of spontaneous glass breakage ...
The risk of a spontaneous breakage in thermally toughened glass that has been heat soak tested in accordance with BS EN 14179-1 is 1 in 400 tonnes of glass. Based on a typical size pane of glass in a double-glazed unit this equates to a risk of 0.015% or approximately 1 in 7,000 sealed units or 1 in 14,000 panes of glass.
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SPONTANEOUS BREAKAGE SAFETY GLAZING
Also called toughened glass, tempered glass has been heat ... related spontaneous breakage. glass surface in compression stresses balance glass center in tension ... break identified by "butterfly-wing" break pattern at center; Right: microscopic nickel sulfide inclusion.
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Spontaneous breakage in toughened glass - Blogger
Spontaneous breakage in toughened glass When you find a butterfly shaped pattern at the origin of a broken glass pane, it might be the clue that you are in front of a spontaneous breakage. The butterfly shape is noted at the point of origin of the break.
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Façade Engineering Blog: December 2014
Spontaneous breakage in toughened glass. When you find a butterfly shaped pattern at the origin of a broken glass pane, it might be the clue that you are in front of a spontaneous breakage. The butterfly shape is noted at the point of origin of the break.
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Technical Forum: Diagnosing Glass Breakage
High-stress breakage due to impact at the glass edge or surfaces near the edge is typically the easiest to identify, as multiple fractures emanate from the point of impact in a spider web fashion (see Figure 9). This breakage pattern is a tell-tale sign that either the glass edge or surface was struck by a foreign object with significant force.
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Spontaneous failure of a passable laminated glass floor ...
It is well known that failure of a thermally toughened safety glass sheet typically results in a relatively dense fracture pattern due to the high amount of energy stored in the prestressed glass sheet. In detail, a NiS induced breakage is characterised by a typical "butterfly" breakage pattern, depicted in Fig. 1a and b.
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Spontaneous Breakages in Fully Tempered Glass: Why it ...
Spontaneous breakage in tempered glass is however much more dramatic, as the whole pane of tempered glass breaks with a loud noise and high visibility as …
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