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Tempered glass is subject to risk of spontaneous breakage. This risk might also derives from a particularity of the glass production process. It may happen that at the time of blast furnace processing, nickel sulphide particles are created inside the plates. They are invisible particles, but unfortunately, following the tempering process, they tend to change size. This over time causes internal tensions in the tempered sheet which can cause spontaneous breakage.

Fortunately, there is a test capable of identifying the glass sheets subject to this risk: the HST, Heat Soak Test. During the test, the glass sheets are brought at about 290° C and maintained at this temperature. This speeds up the breaking process; plates destined to spontaneously break during the test should explode. Those that pass shouldn’t give this type of problem in the future. The HST is regulated by the UNI EN 14179 standard. It is a mandatory test for sheets intended for building facades.

HST by Mappi it’s a complement of the Tempering Furnace with all the design accuracy and production quality that have always distinguished the Italian company production. This was the choice made by Tecnoglass, the Italian company that has established itself as a model of quality and technical expertise in the production of insulating, safety and acoustic glass. 

About his choice Mr. Sardano of Tecnoglass declared: “We already have an ATS 4.0 and we are absolutely satisfied with it. It seemed natural to us to also choose the HST by Mappi, we are sure to find once again design and construction quality, reliability and friendliness. Would you have done differently?”. In fact, we can't blame him.

HST by Mappi is the ideal partner for the furnaces of the Fox and ATS 4.0 series.