This paper presents an overview of glass strengthening by exchange of alkali ions in a molten salt, below the glass transition temperature (chemical tempering). The main applications are in the manufacturing of high strength glazing for high speed trains and aircraft cockpits, from where examples are given. The main parameters of the process which control the glass reinforcement are reviewed. The obtained residual stress state is characterized, thanks to differential refractometry, which is briefly described, along with different mechanical tests for the strengthening measurement. Beside reinforcement, other characteristics of chemically tempered glass are presented. Finally, the concept of ‘engineered stress profile’ glass is presented and its interest for the applications is discussed.

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