Start on a strong, clear foundation
Great glass begins with high quality float glass that is valued for its high light transmission, optical clarity and adaptability. Manufactured using the float glass manufacturing process, float glass is a clear, distortion-free glass that can be produced in a wide range of sizes and thicknesses to suit many different types of architectural and interior applications. Float glass can be tempered, laminated, painted or coated to enhance its performance and aesthetics.
Float glass has high light transmittance, providing clear and undistorted views. Due to its crystal-like clarity, float glass has the incomparable benefit of connecting you with the surrounding nature, while protecting us from the elements. The natural daylight it allows into a building helps with the visual comfort of a building’s occupants, while lowering demand for artificial lighting.
During the float glass manufacturing process, the raw materials are melted to form a hot ribbon of glass, which is then cooled down in a controlled way to introduce into the annealed glass a uniform stress profile. An optimal annealing process helps ensure that the float glass can be cut easily during further processing.
Float glass can withstand the use of time, but it can also be recycled an unlimited number of times. Glass cullet (broken or recycled glass) is one of the raw materials used in the production of float glass. Having already been through the mineralization process, cullet can allow the energy required to heat the mix of raw materials to the fusion state to be reduced, while helping to reduce the quantity of natural raw materials needed to produce the same volume of glass.
Float glass is the foundation of many other technologies. Adding a functional coating on the glass can help improve the overall energy efficiency of a building, while offering many different aesthetic options, from colored to neutral, from more to less reflective. Other technologies can be applied to float glass to modify its appearance, such as acid-etching to provide privacy while letting natural daylight in, or coated to become a high-quality mirror, or bent to inspire new designs.
Float glass is a type of flat glass produced through a process where molten glass is floated on a bath of molten metal (typically tin) to produce a uniform and consistent thickness, flatness and surface quality. This process results in high optical clarity, making it suitable for a wide range of applications, including windows, mirrors, picture frames, tabletops, and shower enclosures. Its versatility and durability make it a popular choice for many industries and applications.
The principal ingredients in soda-lime-silica float glass include sand, soda ash, dolomite, and limestone. The quality of the produced glass depends on the purity and grain size of the input material. The float glass production process begins with the raw materials being melted in a furnace at approximately 2,900°F or 1,600°C. The continuous strip of glass exiting the furnace is known as the “ribbon”.
Forming takes place on a tin bath. The liquid glass floats upon the tin bath at approximately 2,000°F or 1,100°C, to achieve a flat, smooth surface without polishing. On exiting the tin bath, the glass is progressively cooled in the annealing lehr, which releases stress from the glass ribbon. A uniform stress profile supports the reliability of subsequent glass cutting operations. Laser sensors or high-resolution cameras installed along the line capture production data which is evaluated by yield-optimization software to direct a robotic cutting system. The ribbon is cut into stock sheets which are then prepared for storage. The sheets are sprayed with a separation material which helps to prevent scratches and sticking as the lites are arranged into packs.
See in this video how float glass is made or connect to the Training Center to take the Glass Production course and learn more:
Standard float production dimensions can vary slightly depending on the region. In North America for example, the ribbon thickness can range from approximately 3/32” to 19/32”. The typical width of the float glass ribbon is 102 inches, and the maximum length is 240 inches. In Europe, the ribbon thickness can range from approximately 2 mm up to 19 mm. The typical width is 3,21 m and the typical length 6 m.
“The type and thickness of glass to be applied in commercial facades depend on several factors, such as the width-to-height ratio of the glazing, the wind load typical of the building’s location, and eventual live loads at areas where glass surfaces are accessible by people. In addition to these structural considerations, there may be cases when the topic of thermal stress should be analyzed as well, to help mitigate risks of thermally induced breakage. Our team of experts can help with such static and thermal stress calculations, as well as with other advice in the field of building physics related to glass.”
Tamas Kovacs, Technical Services Manager for Europe.
Standard float glass, normally called clear float glass, has a slightly greenish appearance that is particularly visible when looking at the edges of the glass. This slightly greenish tint is due to the presence of iron in the raw materials used to produce float glass. The iron content can be reduced to produce a more neutral glass, known as “low-iron glass”, which can be a good choice for interior design, but also for architects who wish to create very crisp and clean glazed façades.
If a tint to the glass is desired, metal oxides can also be added to the raw materials to provide a grey or green tint. It will not only affect the appearance of the glass but also its visible light and solar heat transmission.
Tinted glass can be combined with low-E coatings to allow more aesthetic options of substrate/coating combinations, to further improve the solar performance of the glass, as well as selecting the right level of light transmission and transparency to help mitigate glare and maintain some privacy.
Our float glass products offer different levels of transparency and color neutrality. Body tinted glass is also available to widen the aesthetic and performance options, especially when used as a base for our low-E coated products.
Guardian™ Glass offers you a wealth of technical notes, tools and online learning to enhance your knowledge about glass and help you specify the most appropriate glass for your project. Visit our Resource Hub to learn more!
Float glass is the base for many applications. It can be further processed to provide additional performance, aspects or shapes, whether for interior design or exterior architectural applications.
High performance glass can be used in windows, doors and curtain wall façades. It is coated to provide thermal insulation and/or solar control properties, which contribute to the energy efficiency of homes and buildings.
Float glass can be heat treated (tempered or heat strengthened) to give it increased strength and safety features. Heat strengthened glass is twice as strong and tempered glass four times stronger than annealed glass. Float glass can also be further processed into laminated glass to provide safety and security features.
The glass can be curved or bent using three different techniques: gravity bending, heat-treated bending and cold bending. Each of these has various benefits and allows various shapes to be formed. Although bending requires technical expertise, our high performance coated glass products can withstand the bending process while maintaining their aesthetic and functional properties.
Glass can be further processed to change its appearance. Acid etching technique gives a satin-feel, translucent surface to the glass. Etched glass is translucent, creating privacy while still letting natural daylight in. Glass can also be coated to become a mirror that provides beautiful reflections and help make small rooms appear larger.
There is not a single project that hasn’t been made possible thanks to float glass. Visit our project section to discover these.
Guardian Glass are experts in the creation and application of glass – constantly developing new glass technologies and techniques to deliver high performance glass solutions all around the world. We’re focused on expanding the boundaries of what can be achieved with glass. From landmark architectural projects to home interiors and retail spaces. This means we work hand in hand with our partners and customers across the supply chain to ensure exactly the right outcome. In other words, when it comes to glass, we help you see what’s possible.
Guardian UltraClear® is a low-iron glass with a brilliantly clear, neutral color that offers incredible aesthetic benefits. It can be used for any application, but is especially suited as a base glass for architectural, interior and specialty applications.See more
Guardian Clear glass is a fundamental building block for many different types of architectural and interior application. It's a glass that’s particularly valued for its high light transmission, optical clearness and adaptability.See more
Guardian® tinted glass offers exciting design possibilities in both exterior façades and interior décors – whether in homes or commercial buildings. It’s performance and aesthetic properties also make it convenient for the automotive and transportation sector.See more