Glass Properties |
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Absorption
Another word for absorptance, which is expressed as a percentage... |
Air Space
The space formed by the spacer bar between two (or more) panes of glass in the production of IG unit.. |
Blister
A bubble trapped inside of glass, or any other gaseous inclusion present inside glass. Generally, in.. |
Bloom
A filmlike appearance on the glass surface. Generally this phenomenon occurs as a result of atmosphe.. |
Annealing range
The annealing temperature range of glass is the interval in which glass changes from a solid t.. |
Attenuation
Attenuation in glass is usually studied by telecommunication engineers, hence is called by the same .. |
Bow
A form of distortion of toughened glass or heat-strengthened glass. During the process of toughening.. |
Brewster fringes
Brewster fringes are a visual effect that appears as a sort of “oily” rainbow on a doubl.. |
Causes of Glass Surface Damages
To avoid glass damage, the surface must be protected during shipment and storage. Appropriate handli.. |
Cavity
General term that refers to the space between panes of glass. The term cavity is used mostly in refe.. |
Cavity in IG
The term cavity refers to the space formed by the space bar between the two (or more) panes of glass.. |
Checks
Very small cracks present in flat glass. They usually occur at the edges of the sheet of glass. .. |
Chemical durability
General term describing the lasting quality of glass while attacked by different chemical substances.. |
Chip
A small shallow piece of glass that has become detached from the original glass edge or face, or the.. |
Cold Zones
Areas in close proximity to glazing, especially single glazing, where exchange of heat by radiation .. |
Condensation
Condensation is a very common phenomenon in everyday life. Although it doesn't have lasting effects .. |
Conduction
Conduction is the spontaneous transfer of thermal energy through matter, from a region of higher tem.. |
dB
“dB” is “decibel” in short.The decibel (dB) is a logarithmic unit of measure.. |
Deflection
A term describing the degree to which glass is physically displaced under a specific load, in compar.. |
Delamination
Delamination is a process in which one or more plates of glass lose the bond with the interlayer in .. |
Dew Point
The dew point is the temperature to which a given parcel of air must be cooled, at constant barometr.. |
Distortion
A phenomenon most commonly present in heat-treated glass (heat-strengthened or tempered) that is man.. |
Edge Clearance
The distance between the edge of the pane and the frame in which it is glazed. The clearance is requ.. |
Edge Cover
Term describing the distance between the edge of the glass and the edge of the rebate forming the si.. |
Edge Defects
Different types of glass defects that are present at the edges, including vents, shells, flakes, wav.. |
Emissivity
Emissivity is a characteristic of the glass surface and is the ability to emit and absorb energy in .. |
Energy Absorptance
Energy that is not transmitted through the glass or reflected off its surface is absorbed. Once glas.. |
Factors Influencing Annealing Glass Breakages
Glass breaks when it is under stress that it cannot withstand. Each type of glass has different brea.. |
Factors Influencing Thermal Breakage
Thermal breakage is a common phenomenon that can occur for many reasons. Generally, thermal loads on.. |
Fire Performance
A period of time in which the glazing unit or an element of construction, such as a wall, partition,.. |
Fire Rated Glass
A term that defines glass proven to offer a certain degree of protection from fire. Fire-rated glass.. |
Fogging
A deposit of contamination left on the inside surface of a sealed insulating glass unit due to extre.. |
Glass Absorption
Energy that is not transmitted through the glass or reflected off its surfaces is absorbed. Once gla.. |
Glass Loads
Glass is subjected to different types of environmental and human loads that can cause the malfunctio.. |
Glass Solarization
Glass solarization is a phenomenon that occurs when certain types of colorless, transparent glass ar.. |
Glass: Solid or Liquid?
This dilemma originates from the time when old sheets of glass were removed from buildings. It appea.. |
Glass Staining
Staining is caused by a chemical change or degradation of the glass surface. In some cases it may al.. |
Heat Loss
Heat loss is a phenomenon that occurs in the colder winter months, when the average exterior tempera.. |
Heat Gain
Heat gain is a phenomenon that occurs in the warmer summer months, when the average exterior tempera.. |
Hose Stream Test
The hose stream test is part of a series of tests that begins with heat testing of the glass. Manufa.. |
Integrity Of Glass
The ability of glass to remain complete and not break down under specific conditions while providing.. |
K Value
The k-value, or heat transfer coefficient, is the measured value of the heat flow that is transferre.. |
Light-To-Solar Gain Ratio
Light-to-Solar Gain Ratio (LSGR) is one way to evaluate the relationship between VLT (Visible Light .. |
Translucent
A glass property that allows light to be transmitted with varying degrees of diffusion so that visio.. |
NIS And Spontaneous Breakage
In various situations, fully tempered glass may break for no reason. Many factors might cause such s.. |
Non Insulating Glass
A term for a fire resistant glass that has the ability to remain intact and continue to provide an e.. |
Passive Coating Material
A general term used to describe a characteristic of a coating that cannot react to an external stimu.. |
Radiation
A generic term which can mean several things depending on how it is used. It most commonly refers to.. |
Security Glass
A characteristic of glass, usually laminated or multi-laminated glass that is designed to withstand .. |
Acoustic Laminate
The term refers to laminated glass assembled for the purpose of acoustic insulation. To obtain such .. |
Snow Load
Because of their aesthetic and practical benefits, glazed roofs have become very popular. A heavy sn.. |
Sound Insulation
The need to restrict outside sound is not only a matter of environmental protection but, principally.. |
Surface Treatment
Sulfur Dioxide (SO2). One of the earliest glass surface treatments was to expose the hot glass to su.. |
Tempering
Toughened or tempered glass is glass that has been processed by controlled thermal or chemical treat.. |
Thermal Break
An element of low heat conductivity placed in an assembly to reduce or prevent the flow of heat betw.. |
Thermal Expansion
Thermal expansion is the tendency of matter to change in volume in response to a change in temperatu.. |
Thermal Stress
Window glass is heated and cooled by visible and invisible (infrared) radiation from the sun and oth.. |
Types of Fire-Resistant Glass
Generally, any type of glass that can withstand the fire test and therefore resist passage of smoke,.. |
U-Factor
The rate of heat loss is indicated in terms of the U-factor (U-value) of a window assembly. The insu.. |
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