United States & Canada - EN

Curved facades

logo Guardian
Performance and energy efficiency

Understand how glass can influence a building's energy and acoustic performance.

Applications of glass

Whether you need glass for facades, interiors, homes, or specific applications, we have a solution

Which glass is right

See how the right glass can help improve your quality of life and the beauty of your home

Understand glass

Learn more about glass and what you can do with it

Design with glass

There’s almost no limit to what you can create with glass

Build with glass

Glass is the ultimate building element, and can be tailored to each project

Glass for your home

We’re helping glass inspire more homes than ever before

7 St. Thomas

Curved glass contributes to harmony between Victorian and contemporary design

Midlands Technical College Library

When glass helps to create a comfortable learning environment

ARO - 242 West 53rd Street

Floor to ceiling windows provide light, transparency and sweeping views of Central Park

All our projects

From landmark construction projects to innovative residential builds, this is how our glass can make the difference

Our story

Just as we were in 1932, we're ready to meet the challenges of now and the future


Find out more about how glass can support sustainable design

Quality control

We strive for quality in everything we do

Our company

Learn more about who we are

Help and contact

Our expertise and commitments

Glass Analytics

Access our comprehensive suite of engineering and analytical tools

BIM objects

Download and use our standardized Guardian BIM content to create project specific BIM files

Seminars and online learning

For anyone who is interested in learning more about glass and its use

How is curved glass made?

Curved glass, also referred to as bent glass, is glass that has been heated past its softening point and formed into a curved shape, either by annealed gravity bending, or by heat-treated (tempered or heat-strengthened) bending. In case of gravity bending, the softened glass is placed over or into a mould and cooled down slowly after the required shape is achieved.

Although it allows many shapes, gravity bending is time consuming and the coating must withstand a longer heating period. With the heat-treated bending process, the glass is cooled down very quickly immediately after the desired curvature is reached to increase its strength. The main challenges here are how to avoid optical distortions caused by the production process and the limitation to cylindrical shapes and concave shapes when coatings are involved.

Curved glass gives architects and designers freedom to create aesthetically pleasing curved glazed facades where straightness, corners and edges can be enhanced with soft curves. These curves can be in the form of simple cylindrical shapes to the more complex 3D free form shapes.

The challenge is to choose a curved glass that still provides the required thermal and solar performance in its curved shape. A crucial factor here is the coating, which has to withstand the bending process without reducing the glass’ visual appeal.

For commercial curved façades, the Guardian SunGuard® range of coated solar control glass products are some of the highest performing bendable glass products available. Guardian SunGuard® glass coatings are designed to withstand the bending process, maintaining their high performance and aesthetic appeal. Using Guardian glass coated products allows to achieve uniform and homogeneous appearance of curved and flat parts of a façade.

This is backed up by technical support and SunGuard® glass coatings’ application advice from Guardian specialists. They work collaboratively with glass processors during the initial design phase to help them define key parameters such as the minimum bending radius, process tests and to produce mock-up samples, regardless of the type of bending process used. We also provide on-site support with the goal to minimise the visual disturbances in the glass such as roller wave, distortion or discolouration of the coating.