Heat Soaked Glass
Heat soaked glass greatly reduces the possibility of unforced breakage and is perfect for applications where additional strength is required.
Glass is formed by combining sand,soda ash,limestone,dolomite,salt cake and various otheringredients into a furnace heated to a temperature around 1500℃. During this process extremely small quantities of nickel sulphide(not visible to the naked eye) can be left undissolved in the glass.
Due to the rapid cooling nature of glass toughening,the nickel sulphide in the glass does not have time to cooldown and is left in its high temperature state whilst increasing in volume .It is this volume increase that causes great stresses in the glass that can cause breakage.
Heat soaking is a precess in which tempered glass is subjected to a temperature of 290℃ for several hours in a heat-soaking oven.This will cause the panel to break if any nickel sulphide inclusions are found.
It is estimated that up to 95% of nickel sulphide-contaminated panes of glass are usually destroyed by this process,reducing the chance of on-site spontaneous breakage.
Heat soaked glass is invaluable for architects and designers,providning added reassurance when specifying projects.
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