The chemical tempering process is being used more and more in the architecture, nautical and automotive sectors as excellent optical qualities are achieved in addition to the excellent mechanical qualities.
The glass treated with the chemical tempering process has no visual defects unlike that with the thermal tempering process.
The thermal hardening process (thermal tempering) produces differently tensioned areas in the cross section of the glass. These tensioned areas produce a birefractive effect in the glass, visible under "iridescence" polarised light.
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