English
EspañolBlue-Sky Safety Glass - Pursue quality and cast high-quality goods.
Home / News / Industry News / The Classification of Heat soaked glass and The Structure of Heat soaked glass
Heat-soaked glass is a type of tempered glass that undergoes a heat soaking process to reduce the risk of spontaneous breakage due to nickel sulfide inclusions. Heat soaking is a destructive testing method that simulates long-term exposure to high temperatures and forces any tempered glass with nickel sulfide inclusions to break during the process.
Heat-soaked glass can be classified into two main categories:
Fully tempered heat-soaked glass: Fully tempered heat-soaked glass is produced by heating annealed glass to a high temperature (typically around 620 degrees Celsius) and then cooling it rapidly using air jets. This process creates a glass that is approximately four to five times stronger than annealed glass and has improved resistance to thermal stress. The fully tempered glass is then subjected to the heat soaking process to remove any potential nickel sulfide inclusions.
Heat-strengthened heat-soaked glass: Heat-strengthened heat-soaked glass is produced using a similar process to fully tempered heat-soaked glass, but with a lower cooling rate. This results in a glass that is approximately twice as strong as annealed glass, but not as strong as fully tempered glass. The heat-strengthened glass is then subjected to the heat soaking process to remove any potential nickel sulfide inclusions.
Heat-soaked glass is commonly used in architectural and building applications, such as windows, doors, and curtain walls, where safety is a critical concern. By reducing the risk of spontaneous breakage due to nickel sulfide inclusions, heat-soaked glass can help to prevent accidents and injuries.Meanwhile,Heat soaked glass, also known as thermally treated glass or heat-soaked tempered glass, has a specific structure that enhances its safety properties. The structure of heat soaked glass involves a controlled heating and cooling process applied to tempered glass, which helps to identify and eliminate potential spontaneous breakage caused by nickel sulfide inclusions. Here's a breakdown of the structure and manufacturing process:
Tempered Glass:
Heat soaked glass starts with a base layer of tempered glass. Tempered glass is produced by subjecting regular annealed glass to a heating process followed by rapid cooling, which creates internal stresses. This process increases the strength and impact resistance of the glass compared to annealed glass.
Nickel Sulfide Inclusions:
Nickel sulfide (NiS) inclusions are tiny impurities that can occur naturally during the manufacturing process of glass. These inclusions are a concern because they have the potential to cause spontaneous breakage in tempered glass over time. When tempered glass with nickel sulfide inclusions is subjected to temperature changes or stress, the inclusions can expand, leading to glass breakage.
Heat Soaking Process:
To mitigate the risk of spontaneous breakage caused by nickel sulfide inclusions, heat soaked glass undergoes an additional heating process known as heat soaking. The purpose of heat soaking is to accelerate the breakage of tempered glass that contains nickel sulfide inclusions.
During heat soaking, the tempered glass panels are placed inside a special chamber or oven and heated to a specific temperature for an extended period, typically several hours. This prolonged exposure to elevated temperatures allows any tempered glass pieces with nickel sulfide inclusions to break. The broken pieces are then removed, leaving behind the glass panels with a reduced risk of spontaneous breakage.
Final Structure:
After the heat soaking process, the structure of heat soaked glass remains similar to that of tempered glass. It retains the inherent strength and impact resistance provided by the tempering process. However, the heat soaking process helps identify and eliminate tempered glass pieces with potential nickel sulfide inclusions, reducing the risk of future spontaneous breakage.
Heat soaked glass maintains its transparency and other physical properties, making it suitable for various applications where safety is a priority. It is commonly used in architectural applications, such as windows, doors, glass facades, and balustrades, as well as in automotive and other specialized glass products.
It's important to note that the heat soaking process is not a foolproof method for detecting and eliminating all nickel sulfide inclusions, but it significantly reduces the risk. Manufacturers typically follow industry standards and guidelines for heat soaking to ensure the production of safer tempered glass products.
