Heat Soaked Toughened Glass

Heat Soaking is an additional destructive testing process that follows the toughening process and is aimed at detecting impurities in the glass like Nickle Sulphide Inclusions. These impurities are often invisible to the naked eye but can cause spontaneous breakage of the glass.

The Heat Soak process heats the glass slowly up to just below its softening point and then slowly cools it again. The process expands the nickel sulphide stones. If the glass has an inclusion or other fault in it, the substantial tension induced in the surface will usually cause spontaneous breakage.

The process is a safe guard to ensure that any toughened glass being used as a life safety barrier or installed overhead does not fail in service. The process still does not offer a one hundred percent defect free certification.