What is Heat Soaked Glass?
Tempering process increases the strength of glass many folds, offering a greater resistance to breakage. However, the raw materials used in the manufacturing of tempered glass are not free from certain defects namely Nickel Sulfide inclusions, which put tempered glass at potential risk of spontaneous breakage. The amount and size of these inclusions vary from glass to glass.
NiS inclusions change their structure & 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 tempered glass may break.
At GSC, we realize the implications of spontaneous tempered glass fracture and the much inconvenience caused. Therefore the concept of heat soaking is defined as the transfer of potential onsite breakage to breakage in the factory under a controlled process of accelerating the inversion of the nickel sulfide inclusions to their low temperature phase. In all probability, the glasses that have NiS inclusions, will break during this heat soaking process.
While heat soaking does not guarantee, that breakage will be completely eliminated in installed tempered glass, which reduces the chances drastically studies have been conducted world-wide indicating the reliability of heat soak test to as high as 98.5%.
All fully tempered as well as heat strengthened glasses for a project can be heat soaked in our heat soak oven.
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 certain defects including Nickel Sulfide inclusions, which put tempered glass at
potential vary from glass to glass. It has been a challenge for the float glass manufacturers
to produce a glass free from nickel sulphide (NiS) inclusions.
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.
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.
We realize the implications of spontaneous Tempered glass fracture and the much
inconvenience caused. Therefore the concept of heat-soaking is defined as the transfer of
potential on-site breakage to breakage in the factory under a controlled process of
accelerating the inversion of the nickel sulfide inclusions to their low temperature phase. In
all probability, the glasses that have NiS inclusions will break during this heat soaking
process.
While heat-soaking does not guarantee that breakage will be completely eliminated in
installed tempered glass, it reduces the chances drastically.
All fully tempered as well as heat strengthened glasses for a project can be heat-soaked in
heat-soak oven.
Precautions :
Heat Soak Testing is not an absolute guarantee that the glass will not break spontaneously
due to NiS but it substantially lowers the risk. Studies have been concluded worldwide
indicating the reliability of heat soak test to as high as 98.5%.
to breakage. However the raw-material used in the manufacture of tempered glass is not
free certain defects including Nickel Sulfide inclusions, which put tempered glass at
potential vary from glass to glass. It has been a challenge for the float glass manufacturers
to produce a glass free from nickel sulphide (NiS) inclusions.
NiS inclusions change their structure and volume duringthe 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.
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.
We realize the implications of spontaneous Tempered glass fracture and the much
inconvenience caused. Therefore the concept of heat-soaking is defined as the transfer of
potential on-site breakage to breakage in the factory under a controlled process of
accelerating the inversion of the nickel sulfide inclusions to their low temperature phase. In
all probability, the glasses that have NiS inclusions will break during this heat soaking
process.
While heat-soaking does not guarantee that breakage will be completely eliminated in
installed tempered glass, it reduces the chances drastically.
All fully tempered as well as heat strengthened glasses for a project can be heat-soaked in
heat-soak oven.
Precautions :
Heat Soak Testing is not an absolute guarantee that the glass will not break spontaneously
due to NiS but it substantially lowers the risk. Studies have been concluded worldwide
indicating the reliability of heat soak test to as high as 98.5%.
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