Glass stratification process
Thanks to its innovative layering system, Veneto Vetro is able to lay two or more flat or curved glass sheets, incorporating different types of interlayers (PVB, SGP, DG41, MILK WHITE PVB, COLOURED or ETCHED PVB) to obtain high resistance performances or aesthetic features. By using various types of interlayers, the Company is able to offer its customers a wide selection of solutions for every taste and need.
Veneto Vetro is always looking for innovative products; for this reason, we work with architects or designers in the study of new materials. For instance, it is possible to interlay glass with a number of different materials: metal meshes, various types of fabric and even organic fibers. Technically, laminated glass is a safety glass that does not break into multiple pieces when fractured. Upon breakage, an interlayer, typically polyvinylbutyral (PVB), intervenes keeping together the glass layers around it. In this way, even if the glass breaks, it does not shatter endangering nearby objects or people.
Generally the PVB used is transparent but on request it is possible to have it in different colours or with an etched or milk white finish.
To improve the acoustic insulation of glass, it is possible to use a particular interlayer with soundproofing properties, commonly called anti-noise PVB.
Veneto Vetro uses the highest performing materials for glass layering, in line with state of the art glass manufacturing techniques. For instance, the Sentryglas Plus (SGP) by DuPont is an interlayer also known as “anti-hurricane plastic”, as it offers high post-break strength and minimises the risk of progressive failure. This particular plastic is used for various applications, as it has greater transparency compared to traditional laminated glass (for optimal transparency the use of extra-clear glass is recommended).
The laminated glass with SGP resists a mechanical stress twice higher than that borne by traditional laminated glass, with a rigidity up to four times higher depending on the load and support conditions. In case of exposure to prolonged solar heat, the glass laminated with SGP has a lower loss of rigidity with reduction of distortions and failure in numerous applications. The Sentry Glass Plus has also exceptional moisture resistance and edge stability.
During the layering process, it is possible to insert metal parts directly into the laminated glass. In structural glass applications, this method makes it possible to use an alternative fastening method, which avoids holes or through-studs.
Some examples of special interlayers and their characteristics:
EVA: This material makes it possible to insert decorative elements inside the laminated glass. The EVA interlayer, a plastic material different than PVB, becomes very flexible and soft when heated, which makes it possible to insert, between two or more interlayers, various materials with a decorative function, such as metallic lattices, PET films, supports for images, textile fibers or photovoltaic cells. It is resistant to heating and humidity.
XIR (Eastman): This type of PVB selectively and intensively blocks UV and infrared rays while maintaining a perfect transparency of the glass and providing considerable energy savings.
SG41 (Saflex): This interlayer offers high performance for solar control.