What is glass Heat Soak Treatment (HST)?
Heat Soak Treatment (HST) is a process that reduces the risk of spontaneous breakage in toughened glass through heating and temperature maintenance. In simple terms, it acts like a 'health check' for the glass, causing potentially defective panes to break during manufacturing rather than after installation.
Core Principle: Tempered glass is heated to approximately 290°C and held at this temperature for a period, inducing premature crystallisation of nickel sulphide inclusions within the glass. This significantly reduces the likelihood of spontaneous breakage later on.
Primary Functions:
1) Reduced Spontaneous Breakage Rate: By triggering latent defects early, the risk of glass breaking after installation is substantially diminished.
2)Enhanced Safety: Ensures greater stability and reliability during use, particularly suited for high-risk applications such as elevated installations and curtain walls.
Process Key Points:
1) Temperature Control: Furnace temperature must be uniform, excessive temperature variations may compromise effectiveness.
2) Holding Time: Typically requires a minimum of two hours to ensure complete transformation of nickel sulphide.
Application Scenarios: Commonly employed in high-safety-demand areas such as architectural curtain walls, high-rise windows, skylights. etc.
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