Technical glossary

Technical glossary

Technical glossary

Veneto Vetro has considered it appropriate to draw up a list with the various technical terms for “non-professionals” in the hope of facilitating the understanding of the vast and versatile world of glass.

According to different needs, in fact, there are different types of glass and technologies to satisfy every request.

Sun control glass
Sun control or anti-solar glass limits the solar energy entering a building. The use of anti-solar glass means energy saving in air conditioning and improves indoor comfort by means of improved temperature and light control. Solar control performance (the solar factor of the glass) varies according to:

  • amount of heat absorbed by the glass;
  • amount of heat reflected.

Burglar and vandal proof glass
Vandal and burglar proof, layered glass protects people and things from acts of vandalism and short burst aggression. Anti-crime glass protects against theft and repeated and pre-meditated aggression. This type of glass serves the purpose of delaying break-ins as long as possible and dissuading aggressors. The level of protection provided depends on the thickness of the glass and PVB used to make up the layered glass. UNI EN 356 standards classify layered glass into 8 security levels according to the type of tests carried out on it and the installation of the windows.
Low emission glass
Low emission glass is glass coated with high quality materials assembled into an insulating window. The multiple glazing can be made up of two of more sheets distanced by one or more spacers. Insulating glass differs from normal glass because of a specific treatment which succeeds in limiting heat loss.
Reinforced glass

Reinforced glass is a layered glass which achieves high resistance levels in accordance with UNI EN 356 norms.

Coated glass

Coated glass is obtained by coating the surface with metallic oxides and used in building to control and improve the optical-energetic performance of the window.

There are two families of coated glass defined on the basis of the manufacturing process used: pyrolytic coated and magnetron coated glass.

Curved annealed glass

Curved annealed glass is slowly bent by force of gravity resting on moulds made to obtain the desired curve. Monolithic curved annealed glass is not a safety glass.

Curved tempered glass
Curved tempered glass is rapidly heated up until it softens and then curved and rapidly cooled. This process ensures greater durability and in the event of breakage it shatters into small pieces.
Safety glass

Safety glass can reduce the risk of accidents from impact, shattering, break up or fire.

Insulating glass
Insulating or multiple glazed windows are made up of two or more panes of glass separated along the edges by air gaps and sealed. The air gap between the panes of glass can be filled with air or inert gas. Numerous types of glass can be used such as enamelled, coated or tempered glass. The components are selected to satisfy the technical characteristics required.
Sound proofing glass
Assembling panels in monolithic glass and panels in layered glass of various thicknesses can provide a high level of soundproofing. To increase the acoustic capacities of the window layered glass with special interlayers with greater sound proofing capabilities can be used maintaining security levels unaltered.
Wire glass
This is obtained by casting and continuous laminating of molten glass into which a mesh of chrome plated metal wires is inserted. This reinforcement is capable of containing the glass fragments temporarily in the event of breakage or fire and providing limited resistance to break in. It differs from tempered glass, however, in that the formation of the fragments produced can cause personal injury and damage to objects and the risk of being hit by splinters which cannot be held by the mesh exists.
Satined glass
This is obtained by subjecting the glass to a surface treatment to make it opaque. A specific ‘acidic’ product is applied to the surface for a limited period of time.
Selective glass
This is glass with a superficial metallic coating which gives it specific properties such as sun control, light deflecting and low remissivity characteristics.
Serigraphed glass
This is glass to which inks have have been applied to the surface with serigraphic frames creating decorative effects. If ceramic inks are used the glass must undergo a heat treatment to make it highly resistant.
Enamelled glass
Enamelled glass is a glass on which opaque enamels have been deposited onto the surface which can also be glazed using a heat treatment. The glass support can be of various kinds such as, for example, clear, extra clear, coloured, reflective or printed.
Frosted glass

Frosted glass is glass which has been made opaque by treatment with a sandblaster.

Layered glass
This is a panel of glass made of up of two or more sheets of glass joined together with one or more interlayers of material called PVB polyvinyl butyral) with a heat and pressure process. The PVB acts as a glue between the sheets of glass modifying their mechanical, thermal and acoustic performance. If the glass breaks, the PVB contains the fragments of glass making layered glass a safety glass.
Multiple-glazing
Insulating or multiple glazed windows are made up of two or more panes of glass separated along the edges by air gaps and sealed. The air gap between the panes of glass can be filled with air or inert gas. Numerous types of glass can be used such as enamelled, coated or tempered glass. The components are selected to satisfy the technical characteristics required.
HST tempered glass
Tempered HST glass undergoes a heat treatment: the glass is heated up until it reaches softening point and is then rapidly cooled. This process prompts a state of compression of the surface of the glass. Tempered glass is more resistant to bending than normal annealed glass.
Tempered glass

Tempered glass is considered safety glass. If it breaks it splinters into small, harmless fragments but provides no resistance to break in.

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