The actual appearance of Pilkington Toughened Glass depends upon the type of glass, the colour and the thickness of the glass selected to be toughened.
Under particular lighting conditions and viewing angles the stress pattern induced by the heat treatment can sometimes be seen. This ‘strain’ pattern is usually noticed in slightly polarised light and is an inherent characteristic of the toughening process. Some slight distortion (bow and roller wave) can occur in such heat treated glass due to the directional nature of the process. This will be accentuated in the more reflective glasses when viewed from the outside of a building.
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