Early laminated glass was generally produced by PVB film. PVB film was originally developed for automotive glass rather than for the building curtain wall industry. Although PVB film has been widely used for many years in the construction industry and gets good performance, it is not suitable for high-performance glass curtain walls due to the features of PVB film as follows:
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Flexibility, softness and small shear modulus
The two glass sheets will have relative slip after being stressed and then it makes less load capacity and larger bending deformation
The SGP (SentryGlas® interlayer) is 5 times stronger and up to 100 times stiffer than PVB films. Besides its strength, SGP retains its clarity &#; even after years of service.
1. SGP laminated glass has a high bonding ability to glass and strong tear strength, which can prevent the glass from breaking and scattering.
2. SGP laminated glass has a strong protective ability which can prevent natural disasters and human damage, and it has sufficient resistance to hurricane, earthquakes, violence, theft, etc.
3. It can withstand the sudden impact, which can prevent the glass from shattering or the whole out and avoid people and articles flying out and falling.
4. It will stay standing when both sides are broken. PVB laminated glass will fall down or breaks when both sides have become damaged.
5. It can either bear greater loads or &#; at the same load &#; can be reduced in glass thickness without compromising safety.
6. It is much less vulnerable to moisture exposure or yellowing over time.
The availability of different glass products within the glass industry is ever growing and changing. New products are constantly being introduced to the market, making it difficult to keep up with the latest styles and trends, whilst meeting building codes and regulations.
The various options of laminated glass processors offer make for more challenges when selecting a custom laminated glass product for an application. Typically, manufacturing &#;custom laminated glass&#; is the process of combining two or more panels of glass with an interlayer, which is placed in between the glass, bonding the panels together. Custom laminated glass is required in applications where safety and structural rigidity is compromised or subjected to high-pressure loads.
The two most popular options are SGP (ToughView) and PVB (ToughGuard).
Below we have gathered some key information to help you identify what laminate you require.
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What is SGP?
SGP (SentryGlas® Plus) is a more rigid interlayer innovated by DuPont and produced by the supplier, Kuraray. The interlayer is 5 x stronger and up to 100 x stiffer than regular laminates such as PVB. This option provides the highest level of structural performance and edge stability for finished glass applications.
When would we use SGP?
Most commonly, when frameless balustrades are required without a handrail an SGP interlayer combined with toughened glass is required- ToughView. ToughView, when broken will hold together if a panel of glass was to break. Regular laminates, when broken are less rigid, meaning they are more likely to collapse and provide no support. This could be particularly dangerous if someone or something is to rest weight on the compromised glass. Edge stability is another factor why SGP is more suited in exposed edge applications as opposed to other interlayers like PVB, as it tends to absorb significantly less moisture, meaning less chance of de-lamination over time.
Common Applications:
Tough Glass recommends:
What is PVB?
PVB is another type of interlayer but does not have the same structural properties of SGP. When PVB laminated glass breaks, glass tends to hold together opposed to that of ordinary annealed or toughened glass. PVB is a more cost-effective solution and suitable product where higher structural performance is not required.
When would we use PVB?
Commonly PVB is used in windows and doors for both residential and commercial fit outs. When used it is highly recommended the edges are not exposed to high moisture or wet areas as this greatly increases the risk of the glass de-laminating and discolouring over a period of time.
Common Applications:
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