Head Soaked Glass


Tempering process increases the strength of glass many folds, offering a greater resistance to breakage. However, the raw-material used in the manufacture of tempered glass is not Free from certain defects including Nickel Sulphide inclusions, which put tempered glass at potential risk of glass. It has been a challenge for the float glass manufactures to produce a glass free from nickel sulphide (NiS) inclusions.

All fully tempered as well as heat strengthened glasses for a project can be heat-soaked in our heat-soak oven. We can heat soak a glass of maximum size 2400 mm by 3660 mm. NiS inclusions change their structure and volume during the heating process of tempering. This changed state is ‘trapped’ during the quenching process.

So at room temperature, the NiS inclusions tend to change back to their original state, which having bigger volume, cause spontaneous breakage. This changing back of state could happen in a few minutes to a few years, making it unpredictable when the tempered glass may break.


  • Tempered Glass
  • Laminated Glass