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Das Prinzip: Glashärtung

durch Erhitzung auf sehr hohe

Temperaturen und abrupte

Abkühlung. Das Glas ist

danach widerstandsfähiger

bei Schockbelastung und

somit langlebiger.

The principle of this technique

consists in tempering the glass

by heating it to very high tem-

peratures and then subjecting

it to sudden quenching.

This procedure increases its

resistance to shock and thus

its durability.