Tempered glass is the result of a specific creation process that makes glass panes incredibly versatile and robust.
The thermal hardening lasts about a few seconds: in this period of time the glass sheet is cooled by means of nozzles that shoot high pressure air directly onto the surface of the sheet: let’s see the process in detail.
Tempered glass: TF Vetritalia’s THERMAL TEMPERING process
In the thermal hardening process the bending furnace is heated up to high temperatures (between 650-750 ° approximately) in order to make the sheet sufficiently viscous and able to adhere to a special concave or convex mold, made internally and arranged on the machine and controlled by a computer that manages the bending phase.
Subsequently, the glass is always positioned on the bending mold, transferred to the cooling station to block the glass surfaces in a state of compression and, inside, in a state of tension.
We have obtained a sheet of tempered glass which is incredibly stronger and more resistant than a classic glass sheet and which in technical jargon is called “safety glass”.
How to identify tempered glass
A tempered glass differs from a classic glass for a series of exclusive characteristics that can be identified through a series of very simple tests and checks, let’s see them together.
Tempered glass needs to be subjected to a glossy grinding on the perimeter in order to make the surface brighter without compromising transparency and brightness.
The first distinctive feature of a tempered glass is the presence of a smooth and uniform edge, which we do not find in a classic glass sheet that usually has slightly rough edges.
The systems that our company uses in the bending and tempering process do not cause aesthetic damage to the glass (due to pinching) as the product travels on ceramic rollers.
In most cases, the execution of holes on the glass sheets causes breakage, therefore this type of operation should be carried out before the thermal hardening process.
When the surface of a tempered glass sheet is scored with a common cutting tool it becomes brittle and irregular.
Looking at a sheet of tempered glass through a polarized lens in sunlight allows you to capture imperceptible details as if you were using a microscope.
If during the test you can spot dark lines in the shadow or scattered dark spots you can be sure that what you are facing is tempered glass.
These imperfections are due to the rollers where the glass sheet is placed during the thermal hardening process.
Tempered glass: why we talk about safety glass
It is true that tempered glass is safety glass but it is not true that all safety glass is tempered..
But then:what is safety glass?
Safety glass is a type of glass made in such a way that the likelihood of causing injury if broken is very low.
However, safety is not a characteristic of tempered glass only: laminated or engraved glass can also be defined as safety.
The process used to make a sheet of glass tempered or to make a laminated glass, a metallic glass, an engraved glass can be combined and integrated to produce different types of safety glass that is tempered, laminated, cross-linked and engraved at the same time.
The safety glass is then used for the production of glass for cars, residential and commercial structures, for electronic devices and for home furnishing supplies.
The applications of tempered glass
Tempered glass is incredibly versatile and is widely used in various sectors such as furniture, architecture, shipbuilding and the household appliances sector.
TF Vetritalia realizes:
- Curved tempered glass for the construction of balustrades and interior furnishings on boats and ships;
- Curved tempered and laminated heated glass for shop windows, offices, hotels and restaurants;
- Curved tempered and laminated glass for the construction of buildings where a high level of safety is required to be installed both inside and outside the structure;
- Curved tempered glass for shower box;;
- Curved tempered glass for refrigerated display cases.