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  • Heat Soak

  • Nickel Sulfide(NiS) has been known to be the cause of spontaneous explosion in tempered glass. During tempering the nickel sulfide is transformed to the high temperature α-phase(T>380oC) and has no time to return to the β-phase on quenching. With the passage of time NiS slowly inverts to the low temperature β-phase with an increase in volume of about 4%. This volume expansion may cause glass breakage. 
    The Heat Soak  is a destructive treatment which heats the glass for 2 hours at about 280 °C to speed up the α-NiS to β-NiS transformation and consequently forces the contaminated glasses broken within the oven. 
    At present Heat soak test is the best way to solve the spontaneous explosion in tempered glass in the world.

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Nickel Sulfide(NiS) has been known to be the cause of spontaneous explosion in tempered glass. During tempering the nickel sulfide is transformed to the high temperature α-phase(T>380oC) and has no time to return to the β-phase on quenching. With the passage of time NiS slowly inverts to the low temperature β-phase with an increase in volume of about 4%. This volume expansion may cause glass breakage. 
The Heat Soak  is a destructive treatment which heats the glass for 2 hours at about 280 °C to speed up the α-NiS to β-NiS transformation and consequently forces the contaminated glasses broken within the oven. 
At present Heat soak test is the best way to solve the spontaneous explosion in tempered glass in the world.

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