![]() So what impact does the heating then have? It has a major impact. Surprisingly, the worst iridescence examples usually are caused in the heating section. People tend to think that iridescence is caused only by the quench. However, that is only theoretical with heat-treated tempered glass. If you heat the glass uniformly and quench the glass uniformly, you have no iridescence. They both have an impact – so it is about the uniformity of both. It is not only about heating, nor is it only about quenching and cooling. This is already an important distinction. Iridescence is caused by uneven heating or uneven cooling in the tempering process. To understand how the iridescence can be minimized in a tempering line, it is crucial to understand what causes it.
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