Surgoinsville, TN – August 2, 2012 – Contour Glass recently commissioned a heat soak testing chamber, which is used in the detection of nickel sulfide inclusions in tempered glass. Nickel sulfide inclusions are a leading cause in the spontaneous breakage of tempered glass. During the heat soak testing process, tempered glass is heated incrementally from ambient to a temperature of approximately 300° Celsius. The test chamber is sensor controlled through a critical “soak” time, and then a cooling down process. This measured heating and cooling method accelerates the expansion of nickel sulfide inclusions, which substantially increases the probability of forced breakage during the testing process and minimizes the chances of spontaneous breakage after installation. While the heat soak process is recognized as the best approach for the detection and elimination of nickel sulfide inclusions, the test does not ensure total elimination of spontaneous breakage. For additional peace of mind, Contour Glass offers heat soak tested (HST) glass in sizes up to 100” x 148” and in thicknesses from 1/8” to 3/8”.