How does tempering strengthen the glass

On a daily basis you encounter glass in all shapes, sizes, and compositions. You can also find glass in impact and explosion resistant lighting applications in demanding environments like coal mines and oil rigs. In all these applications, glass must be able to withstand a certain level of abuse and still maintain performance. In this video we review the basics of glass tempering and how this process results in a stronger glass product. Tempered glass, commonly referred to as safety glass is used for intense, demanding applications.

Glass can be strengthened using a controlled heating and cooling process. Approximately 4X the mechanical and thermal strength of annealed glass. Tempered glass retains the normal properties of annealed glass including chemical resistance, hardness, expansion and deflection.

It does not retain normal strength and breakage characteristics. The break pattern for tempered glass is a pattern of small dices or particles. This is considered much safer than the often large sharp shards that may result from broken annealed or heat strengthened glass. May be prone to spontaneous breakage due to inclusions or tiny impurities in the glass such as nickel sulfide or if a treatment such as machining was applied to the edge post tempering causing the glass to weaken.

Heat Strengthening Heat-strengthened glass undergoes a slower cooling process than tempered glass resulting in a lower compression strength.

The air-quench temperature, volume, and other variables cause a surface compression of at least 10, psi or 69 MPa. This tempering process will make the glass up to 4X stronger and safer than annealed or untreated glass. Tempered glass is also less likely to experience breakage through thermal shock. Approximately 4X the mechanical and thermal strength of annealed glass. Tempered glass retains the normal properties of annealed glass including chemical resistance, hardness, expansion and deflection.

It does not retain normal strength and breakage characteristics. The break pattern for tempered glass is a pattern of small dices or particles. This is considered much safer than the often large sharp shards that may result from broken annealed or heat strengthened glass. May be prone to spontaneous breakage due to inclusions or tiny impurities in the glass such as nickel sulfide or if a treatment such as machining was applied to the edge post tempering causing the glass to weaken.

Heat Strengthening Heat-strengthened glass undergoes a slower cooling process than tempered glass resulting in a lower compression strength.

Has a break pattern of large pieces, very similar to that of annealed glass. The shape and size is dependent upon the applied load, the origin of the break, the temperature of the glass, etc.

Is rarely prone to spontaneous breakage due to machining or other edge treatments. The firm presented its case for a cleaner built environment during the Climate Change conference in Scotland. Sustainability leader Sarah King explains how developers and contractors can use the new EC3 software tool to reduce embodied carbon in their buildings. Glass has always been an idea generator. An architect who has worked on some of the nation's largest and most significant mass timber construction projects shares his thoughts on the latest design trends and innovations in mass timber.

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Profile: Anonymous. Continue Reading. Tags Building Materials. Urban Planning Nov 11, Reimagining the concrete and steel jungle, SOM sees buildings that absorb more carbon than they emit The firm presented its case for a cleaner built environment during the Climate Change conference in Scotland.

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