Substrates are individual glass plies used to fabricate the final product, usually known as float glass, raw glass or also as monolithic glass. Substrates are available in clear, extra-clear or tinted options, in different thicknesses. Clear glass substrate has a slightly green color. Extra-clear (low iron) is a substrate with lower iron content in its mass, which reduces its green shade and increases transparency. There are many glass substrate color options. In addition to providing a specific appearance, the colors offer the advantage of improving performance of the glazing.
|Clear||Green||Gray||Dark-Green||Bronze||Blue||Extra-clear (low iron)|
THICKNESSES All substrates are available in 4 mm and 6 mm. For other thicknesses, please, contact our Commercial or Specification division.
Anti-glare glazing is obtained by applying a coating that mitigates unwanted luminous reflections without changing the glass transparency. It is perfectly suited for environments that require low reflection, such as showcases and libraries.
The transparent coating applied to the glass works as a “repellent” for dirt, water and other fluids, thus optimizing the maintenance and cleaning operations. Since the self-cleaning properties are activated by solar light, this type of glass is recommended for facades and coverings.
GlassecViracon offers two types of fire-resistant glazing: flame-guard and flame-proof. The flame-guard type allows the glass to maintain its transparency upon occurrence of fire, thus enabling the saferemoval of people and allowing to view the burning areas. It is rated E (Integrity), which is the rating internationally granted to those products that prevent the passage of flames and toxic gases for a certain period of time.
The flame-proof glass is rated EI (Integrity and Insulation), which designates products that, in addition to preventing the passage of flames and toxic gases, also promotes insulation from heat for a certain period of time.
Both types of fire resistant glass meet the requirements of the Fire Department and are recommended for application in façades, partitions, windowsills, doors, windows and roofs.
POSITION OF THE SUBSTRATE In glass units with multiple layers of glassit is essential to specify the substrate to be used in each layer, since the position of each glass layer is directly related to its performance.
6mm Coating Glass with substrate Green #2
+ 12mm airspace + 6mm Clear
6mm Coating Glass #2 + 12mm airspace
+ 6mm Green
6mm Coating Glass with substrate Green #2
+ 0.38mm Clear PVB + 6mm Clear
6mm Coating Glass #2 + 0.38mm
Clear PVB + 6mm Green
Coatings are thin metal layers applied to the glass lite in order to improve its energy performance. This is why it is known as solar control glass . The first generations of coatings were reflective layers, which provide the building with a mirrored appearance. Due to its high reflectivity and solar light absorption, reflective glass reduces the incidence of heat. Due to its high reflectivity and solar light absorption, reflective glass reduces the incidence of heat, providing the building with thermal comfort and a less intense light transmission. More recently, low-e coatings have been playing a leading role in urban landscapes. Because of its capacity to reflect long-wave infrared radiation, low-e coated glass reduces even more the absorption of heat, which results in greater savings of energy for the building. Reflective glazing and low-e may be manufactured through on-line or off-line processes, also known as pyrolytic and sputtering, respectively. In the first one, a thin metal layer is applied during the float glass manufacturing process. In the off-line process, on the other hand, multiple layers of coating are applied inside a vacuum chamber. The reflective and low-e glazing processed by GlassecViracon meets the requirements of NBR 16015.
The coated product position follows the names recommended for the surfaces, also referred to as sides. Each glass ply has two sides. The side facing the outside of the building is called side #1; the back side of such piece is side #2.
For glazing with many glass pieces, it is necessary to name each one of them according to the examples below.
Spandrel is a panel placed between the vision area and the area that covers structural columns, floors and walls. For this type of application, GlassecViracon offers alternatives in silkscreened glass.
Generally speaking, a project requires the spandrel glazing (spandrel) to harmonize with the glazing of the building’s vision areas. Sometimes, however, this effect is difficult to achieve when the glass has high light transmission and low external reflection — that is, when the glass is more transparent. For these cases, low-light transmission glass combined with high-reflection glazing offer the least contrast between the spandrel and the vision areas.
Additionally, the varying conditions of the sky can also influence our perception of glazing colors and their general appearance. On a clear sunny day, the intensity of the exterior light is approximately 50 to 100 times greater than in the illuminated interior of the building. When seen from the outside of the building, the prevailing visual characteristic of the glass is its external reflection. In cloudy days, there is a greater visual disparity between the spandrel and the vision area. This effect is due to the transparency of the glass and the perception of depth created by the interior light. The areas of the spandrel tend to have a flat look with only two dimensions, by contrast.
Spandrel glass gets opaque because they can only be seen by reflection. Vision area glass, on the other hand, has a certain degree of transmission. Because light transmitted in vision areas increases when the weather is cloudy, the interior light becomes prevalent. GlassecViracon recommends analysis of real size samples or prototypes of the glazing to be used in the harmonization between the vision area and the spandrel when the glass light transmission of the vision area exceeds 14%. A greater contrast between vision area and spandrel occurs when non-coated colored (green, bronze, blue, among others) glazing or high light transmission glass is used. Under such conditions, insulating units in the spandrel may create the illusion of depth and have a similar look as that of the vision area in a more precise manner. By building the vision area and the spandrel in a similar way (same color external glazing and coating, among others), the contrast may be minimized .
Due to its great versatility, silk-screen glass is broadly used in coverings and facades to meet the requirements of energy performance and design. GlassecViracon’s silk-screen glass is heat-toughened to offer more strength than a monolithic glass of the same thickness, type and size. When tempered, strength is even greater. To develop your silk-screen product, it is keyto choose the pattern, color and direction of the figure on the face where it will be applied. In case you prefer to create your own drawing, please, send it to us in high-resolution DWG file and our team will develop your product. SILK-SCREEN PATTERNS 20% coverage 30% coverage 50% coverage 60% coverage For application on faces #2 and #3 of laminated glazing units the pattern cannot exceed 25% coverage.
In fully silk-screened glass the ceramic frit is applied over the entire surface of the piece, using the RAL standard colors. This technique is widely applied in spandrel glass and wall coating.
The moiré effect is an optical phenomenon showing wavy, rippled or circular patterns under certain conditions. This image pattern is produced when two regularly spaced patterns overlap but are not aligned. Common examples of such effect are window screens and woven fabrics. In this case, the moiré pattern seems to “flicker” when light is reflected on its surface.+ Learn more about the possibility of this phenomenon occurring in silk-screened applications.
Moiré effect When silk-screenedpatterns are applied in architecturalglass applications it is possible that a moiré pattern appears under certain lighting conditions, specific angles of daylight incidence or other factors regarding the particular dynamics of the construction work process. Each of the flat glass surfaces reflects light. When a silk-screen pattern is applied to face #2 of an insulatingunit, its image is reflected outwards from face #3 of the glazing unit. The interference of the image reflected from face #3 with the silk-screen pattern applied on the face #2 causes the moiré effect. This feature may be enhanced by the air inside the air chamber placed between the layers of insulating glass. The air expands when it is heated and contracts when cooled. Glass deflection may create the necessary conditions for the moiré pattern to form, or mayfurther distort the reflected image of silk-screened patterns. Large dimension glass plies have greatpotential to offer conditions for the occurrence of the moiré effect. Buildings in construction also have greater potential to display this phenomenon since the glass temperatures still have not been stabilized by controlled temperatures. Even though it is impossible to identify when the conditions for the appearance of the moiré pattern may occur, the following circumstances are likely to contribute to this effect:
GlassecViracon recommends a real-size prototype be used to assessany project design that contemplates the application of silk-screened patterns. The prototype must be installed at the building site and viewed under different temperature and lighting conditions.
Thermal treatment is the process through which glass goes in a tempering furnace in order to change its characteristics of resistance to thermal and mechanical variations. This process reinforces the float glass properties, causing it to have breakage patterns that are appropriate to applications in safety glazing.
GlassecViracon provides two types of glass issued from the thermal treatment processes: heat-strengthened and tempered glass. For thermal treatment of solar control glass, GlassecViracon recommends a minimum thickness of 6 mm.
It is twice as resistant as float glass of the same thickness and size. In the event of breakage, the splinters of heat-strengthened glass behave similarly to float glass, and do not fall off the glass framing.
This type of glass is submitted to thermal treatment to develop a surface compression ranging from 3,500 to 7,500 psi, which meets the requirements of ASTM C 1048 standard for heat-strengthened glass.
It is four to five times stronger than float glass and two-and-a-half times stronger than heat-strengthened glass of the same thickness and size. In the event of breakage, the tempered glass forms small, relatively harmless pieces, thus reducing the chances of bodily injury and making it easier to release the broken glass panel from its framing.
This type of glass is submitted to thermal treatment to achieve a minimum surface compression of 10,000 psi or an edge compression equal to or higher than 9,700 psi, and which meets the requirements of NBR 14698:2001 and/or NBR 7199:1989 Brazilian Standards for glass in civil construction.
GlassecViracon offers holes and cut-out options to customize your product.Please, contact our team to learn about our options.
Next you will find the standard cut-out profiles supplied by GlassecViracon.Should you want a special profile, please, contact our team.
Flat, pencil or pencil polish edges–these are the three types of edge finish available from GlassecViracon. Should you want a special edge finish, please contact our team to find out about the options available.
A process that roughly eliminates sharp surfaces, making the edges slightly diagonal.
A process that totally eliminates any sharp surfaces, making the edges smooth, with whitish-gray look.
A process that eliminates sharp surfaces, making the edges smooth and with a shiny look.