Tempered glasses are used in large extent in recent years such as solar glass, laminated glazing, glass containers etc. So, it is important to check the quality of tempered glass. Various devices are available in the market as tempered glass detectors to determine if the glass has been suitably tempered. The devices informs about that the glass has been through tempering furnace and non-uniform heat treatment. These devices are incapable to assess the level of tempering as the surface compression, cannot be observed by determining glass thickness.
Glass manufacturers all over the world have been using the quantitative measurement of residual surface compression. It is a reliable and non-destructive indicator of mechanical strength and break pattern in heat treated glass. When viewed in a Polariscope Strain Viewer, stress is visible due to optical property in glass, plastics and various other translucent or transparent materials. It causes the incident light to show two indices of refraction offset at 90° to each other and moving at various speeds, with a phase shift which is proportional to stress and presented by an interference pattern that occurs as a distinctive and repeating sequence of colors.
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