The meaning behind the glass

 The meaning behind the glass..

We are all very familiar with a standard glazing window be it single glazed, double glazed or a triple Glazed unit. Specialised windows however can be more complex and require more information and understanding.

Below we explore the ranges and define.

What is Low E Glass?

Glass used in double glazing window for thermal insulation is known as Low E glass. It has a transparent metallic coating that works in two ways to economise heating energy. The dual action coating reflects heat back into the room, whilst allowing heat and light from the sun (known as passive solar heat gain) to pass through.


What is Toughened Glass?

Toughened, or tempered, glass is four to five times stronger than ordinary float glass. If it is broken relatively harmless fragments, known as ‘dice’, are formed which are unlikely to cause injury. Toughened glass that meets with the highest Standards, Class A, is suitable for use in structural double glazing window where the glass is to be fixed by bolts or clamps.

Toughened glass is made by heating prepared and processed glass sheets to a temperature of 700°C (just above the softening temperature of glass) The sheets are rapidly cooled by blasts of cold air to both surfaces, resulting in the outer surface contracting and solidifying before the interior of the glass. This process increases the tensile strength of the glass and gives it safe breakage characteristics.

What is Acoustic Glass?

Acoustic glass considerably reduces outside noise, especially near busy areas such as motorways, main roads and airports. When used in overhead or roof glazing, double glazing window also provides insulation from rain impact noise. It can be used for interior sound insulation needs, such as office partitions and meeting rooms.


What is Ballistic Glass?

This glass is designed to resist the impact of bullets. It is extremely strong and visually transparent material and it is comprised of slim layers of a type of resilient plastic, known as polyvinyl butyral (PVB). Layers of PVB are inserted between sheets of glass and then the entire unit is sealed together by heat. As the layers build up, the product becomes stronger and the more layers that are included in the fabrication process, the more bullet-proof the glass becomes.

How does Ballistic Glass work?

Hopefully you have not seen bullets fired at Ballistic glass in real life but you may well have seen movies or images showing the impact. Typically the strong PVB inter-layers absorb the energy of the bullet and prevent it from passing all the way through the glass. Ballistic glass goes through a thorough testing process so that it can be graded according to the calibre of weapon used – a hand gun will have significantly less power than a machine gun for example and the level of protection needed dictates the required specification of the bullet-proof glass.


What is fire Glass?

In the industry, this is often referred to as Fire-rated glass as it has to be manufactured to approved standards and can then be rated appropriately. The purpose of this glazing is to act as a protection against the spread of fire and smoke. The ratings are allocated according to the amount of time the glass can contain and withstand against the fire and the ratings range from half an hour to three hours. The final part of the test includes the heated glass being blasted by a two-person fire-hose, to assess its ability to resist water pressure and thermal water shock.

Can fire-rated glass be used in external spaces?

Yes, we can produce fire glass for both external and internal environments. Again the specification of the glass will be impacted but the application so call us to learn more



How do EVA and PVB differ?

Both products are known as “Interlayer Films”and both are used in the fabrication of safety laminated glazing. PVB is the more common film and it is easier to work in certain respects; equally EVA is an innovative alternative with specific advantages over PVB.

Polyvinyl Butyral (PVB) is primarily used in applications such as windscreens for motor vehicles and laminated safety glass for architectural building windows. It is generally not applied for exteriors as it not highly weather-resistant.

EVA is often used for Architectural glass and in applications such as Overhead, Vertical and Sloped safety glass. Its primary advantage is its robustness and the fact that it is moisture-resistant and therefore effective in exterior applications.

More advantages of EVA film include

  • Superior Light Transmission (≧92%)
  • Practically Complete UV Protection (≧99%)
  • High Tensile Strength (≧21 Mpa)
  • Strong Adhesion (≧50N /cm )
  • Qualified Impact Resistance (As has PVB)
  • Moisture Resistance As PVB Does

There is a commercial consideration however as EVA is typically more expensive than PVB materials therefore if that level of protection is not required, it can make more commercial sense to specify PVB. Equally EVA offers significant advantages.

Request more information from our highly skilled sales team.

Contact Diamond Glass │ 01 620 5000