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Anisotropy

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Highlights
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

Discover our showcase projects, captured through the lens of professional photography.

Explore Guardian Glass projects in your area and beyond with Google Street View and be inspired by the possibilities.

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Our story

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

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Find out more about how glass can support sustainable design

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Anisotropy

Illustrations for Catalogues

During the production of tempered and heat strengthened glass on an oscillating roller hearth furnace the glass is heated above its softening point. Then, it is cooled, with high velocity blasts of air. This process results in compression at the glass surface and edges, and compensating tension in the centre of the glass thickness. What occurs is a slightly higher level of surface compression directly opposite the air nozzles or slots. Consequently, this produces a slightly more dense glass at these locations. In addition to this, a complex light interference phenomenon can cause areas to exhibit a darker appearance under various viewing conditions. These conditions include polarised light, particularly near the horizon, and viewing at oblique angles to the glass surface.