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Abrasion
The technique of grinding shallow decoration with a wheel or some other device. The decorated areas ..
Annealed glass
Annealed glass is the basic flat glass product that is the first result of the float process. It cou..
Acid-Etched Glass
It is produced by acid etching one side of float glass. Acid-etched glass has a distinctive, uniform..
Active coating material
This is a general term used to describe a characteristic of a coating that can react to an external ..
Adhesive Glazing
Any adhesive intended by the manufacturer to adhere glass, ceramic, metal, stove, or composite panel..
Air Space
The space formed by the spacer bar between two (or more) panes of glass in the production of IG unit..
Alastair Pilkington
Sir Alastair Pilkington, who was honored with a knighthood in 1970, invented the "float" m..
Alarm Glass
Alarm glass is a special laminated glass designed and manufactured for security purposes. The glass ..
Ancient glass
A term normally used to describe any type of glass manufactured before ancient Roman glass...
Blibe
A cavity that is larger than seed and filled with gas. ..
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..
Blast Resistant Glass
Shards of glass flying through the air cause many deaths and injuries from a bomb blast. In a bomb b..
Annealing
Annealing is a process at the end of glass production in which the entire sheet of glass remains uni..
Annealing range
The annealing temperature range of glass is the interval in which glass changes from a solid  t..
Anti-Reflective Glass
Anti-reflective glass is float glass with a specially designed coating that reflects a very low perc..
Antique glass
A general trade term used to define an old type of glass more than 25 years old; however antique gla..
Antique mirror
This a decorative silvered glass used mostly for interiors. This method of making glass consists of ..
Aquarium glass
This is a term describing glass used in the construction of aquariums (fish tanks). Most aquariums c..
Architectural Glass
Architectural glass is a world used for any type of glass used a as building material. It is most ty..
Argon Gas
Replaces the air between a double glazed unit. Described as being a heavy gas, it is relatively chea..
Arrissed Edge
An arrissed edge is a basic form of edge-working done in the glassmaking process by removing the sha..
Attenuation
Attenuation in glass is usually studied by telecommunication engineers, hence is called by the same ..
Cutout
The removal of an internal section of a glass panel...
Autoclave
A pressure tank used at the end of the glass lamination process to bond together glass and a PVB int..
Autoclave Safety Tips
In the production of high-quality laminated glass, autoclaves are used. An autoclave produces heat a..
Ball gatherer
Tool or machine capable of collecting molten glass from the glass furnace. This can be made by hand,..
Balustrade
A general term usually used for describing a barrier or railing, usually about waist height, that pr..
Basic glass
A term used to describe the glass used as a raw material for further processing. In the flat glass i..
Batch
Batch refers to a mixture of raw materials (most glass is a mixture of silica, soda, lime, and culle..
Bead
The common strip of wood, metal, or other suitable material used to retain glass in a frame...
Bending
A process also known as curving in which glass is heated past its softening point (to become soft) a..
Bent Glass
Bent glass is normal glass that has been curved with a special process. It can be used for external ..
Bevelling
The process Beveling is a process whereby the edges of a piece of glass are angled from some point ..
Blowpipe
Usually an iron or steel tube used for forming glass by means of blowing into it. It is usually 5 fe..
Body-Tinted Glass
Body-tinted glass is normal float glass into whose melt colorants are added for tinting and solar-ra..
Borosilicate glass
The third major group of glass, borosilicate glass, is any silicate glass composed of at least 5%&nb..
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..
Brilliant Cut
A form of decorative process in which specific designs are cut into the glass surface by means of ab..
Bullet-Resistant Glass
Bullet-resistant glazing is made of laminated glass that consists of two or more lites of glass adhe..
Butt Joint
A butt joint is a general term that describes a technique in which two edges are joined by simply bu..
Butyl
Butyl rubber, also known as polyisobutylene, is a synthetic rubber or elastomer. It was first develo..
Came
A narrow flat bar of lead, zinc, or copper that holds the pieces of glass together in copperlight gl..
Cast glass
This is a type of glass produced by a casting process in which molten glass in poured into a shaped ..
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..
CE Marking
The CE abbreviation stands for Communauté Européenne (European Community) and states t..
Ceramic Fritted Glass
Ceramic fritted glass consists of a ceramic-based paint screen-printed onto clear, tinted, patterned..
Cerium Oxide
Cerium oxide, belonging to the group of elements known as the rare earths, occurs in nature in diver..
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..
Chemical Strengthening
Chemical strengthening is a term describing a process that occurs at a temperature lower than glass ..
Chip
A small shallow piece of glass that has become detached from the original glass edge or face, or the..
Clear Glass
A term used to describe properties of an extremely transparent and clear glass that contains no colo..
CNC
Acronym for Computer Numerical Control. CNC is a processing machine operated by a computer that can ..
Coating
Coating is a chemical composition used as a covering that is applied to the glass surface in order t..
Cold end
The term defines the stage of glass production in which glass is processed after it is already cold...
Cold Zones
Areas in close proximity to glazing, especially single glazing, where exchange of heat by radiation ..
Compound
Glass is neither an element nor a mixture but a compound. This means that glass is a pure substance ..
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..
Convection Technology
Convection technology is designed to improve both quality and process speed, especially with newly c..
Crystal Glass
Crystal glass (also known as “crystal”) is a form of glass with a high degree of transpa..
Cullet
Glass cullet is generally understood as recycled bottle glass that is normally collected by househol..
Curtain Wall
Curtain wall is a term used to describe a building façade that does not carry any dead load f..
Cut sizes
Glass that is cut to a final size ready to be processed and glazed. ..
Cutting
A process in which glass is cut with the help of a line etched by a diamond, steel, or hard alloy wh..
dB
“dB” is “decibel” in short.The decibel (dB) is a logarithmic unit of measure..
Decorated glass
A term used for glass that was decorated by a glassworker for decorative purposes. Glass types are s..
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 ..
Depression Glass
The Great Depression in the United States was a time of severe financial problems for the majority o..
Design Heat Loss
Heat loss calculations are made to determine a building heating load. Design heat loss calculations ..
Dessicant
Molecular sieve or extremely porous crystalline substance used for adsorbing the resident moisture a..
Diamond Wheels
Diamond wheels are actually abrasive tools coated with diamond powder. As glass is an extremely hard..
Digital Printing on Glass
Digital printing technologies have advanced, and new systems and inks are becoming available that of..
Distortion
A phenomenon most commonly present in heat-treated glass (heat-strengthened or tempered) that is man..
Double bevel
A decorative form of edge-working, where the edges of glass are ground and polished in such a way th..
Double Skin Facades
In recent years, the use of double skin facades, sometimes referred to as a "building in a buil..
Drained glazing
Any type of glazing in which any water that enters the system is drained out. This can be done by co..
Drawn Sheet Glass
A type of glass produced by two possible processes. First is the vertical method, which was invented..
Dry Glazing
Also called compression glazing, a term used to describe various means of sealing monolithic and ins..
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..
Edge Polishing
Term describing work done to the edge of a sheet of glass. This work might include an arrissed edge,..
Edge Seal
The hermetic seal around the edge of an insulating glass unit. The purpose of this seal is to preven..
Edge Work
Edge-working is a process usually done by different types of edge-working machines where, after the ..
Elastomer
An elastomer is a polymer with the property of elasticity. The term is derived from elastic polymer,..
Electrochromic Glass
Electrochromic glass is an energy-saving component for buildings that can change color on command. I..
Electronic Smart Glasses
A smart glass is intended to have the ability to control the amount of light, and heat passing throu..
Emissivity
Emissivity is a characteristic of the glass surface and is the ability to emit and absorb energy in ..
Enameled Glass
Enameled glass is tempered or heat-strengthened glass, one face of which is covered, either partiall..
Energy Absorptance
Energy that is not transmitted through the glass or reflected off its surface is absorbed. Once glas..
Engraving
A process in which the glass surface is abraded to produce a decorative design, achieving so-called ..
Etching
A process in which a glass surface is altered for decorative purposes with acids or special tools. T..
EVA interlayer
EVA stands for ethylene vinyl acetate, a copolymer resin used in the production of laminated glass a..
Facade
In architecture, a term used to refer to the front exterior of a building. Also, other exterior side..
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..
Fenestration
Fenestration is the arrangement and proportioning of windows, used by modern writers for the decorat..
Figured Glass
Also known as "patterned" or "ornamental" glass, figured glass is a decorative a..
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..
Float Glass
Float glass is a sheet of glass made by floating molten glass on a bed of molten tin. The term &ldqu..
Fluoride Removal
Fluoride removal in drinking water and wastewater has been subject of many publications and studies ..
Fogging
A deposit of contamination left on the inside surface of a sealed insulating glass unit due to extre..
Fused Glass
Fused glass is a term for glass that has been fired (heat-processed) in a kiln at a range of high te..
Fusing
Fusing is a basic step to create glass art, glass tiles, and other functional glass pieces. Most con..
Gasket
A pre-formed, resilient, rubberlike compound providing a continuous surround for glass. Gaskets are ..
Georgian Bar
Several bars fixed inside an insulating glass unit in order to enhance the appearance of the unit an..
Glass
Glass is by definition an amorphous solid material made by fusing silica with a basic oxide. Glass i..
Glass Absorption
Energy that is not transmitted through the glass or reflected off its surfaces is absorbed. Once gla..
Glass Block
Glass block is a material with innocuous and radiationless properties as well as excellent performan..
Glassblowing
A special technique in which glass is formed by inflating molten glass into a glass blob with the ai..
Glass Care
To avoid damaging glass, as well as maintain its surface condition and clarity of vision, glass shou..
Glass Ceramics
Ordinary glass is non-crystalline. Glas ceramics however, are manufactured through the controlled cr..
Glass Drills
In order to furnish improved results, glaziers now have to select the appropriate type of drill. In ..
Glass Films
By definition glass films are a thin, transparent sheet that can be applied to the interior or exter..
Glass Lites
Synonymous to sheet glass. A transparent, flat glass found in older windows, now largely replaced by..
Glass Loads
Glass is subjected to different types of environmental and human loads that can cause the malfunctio..
Glass Mosaic
A glass mosaic is a coherent pattern or image in which each component element is built up from small..
Glass Scratch Removal
When glass is used in windshields, stores and offices, it can be damaged by external stimuli such as..
Glazing Bead
The common mechanism such as wood, metal, or other suitable material used to retain glass in a frame..
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..
Glass Storage Techniques
The selection of an appropriate system may save storage space and reduce the incidence of glass brea..
Glass Thickness Measurement Laser
For glass thickness, just press a button on the laser tool and read the results on the display. The ..
Glazed Roofs
Architectural glazing products are employed in a myriad of situations that require consideration of ..
Glazing
A term with several meanings depending on how it is used. Glazing can mean the securing or insertion..
Ground Glass
Ground glass is glass whose surface has been ground to produce a flat but rough (matte) finish. A sh..
Handling Coated Glass
If improperly handled the integrity and properties of coated glass can be compromised just as with a..
Handling Curved Glass
The glass should rest on three supports formed by wooden wedges, and must be single-stacked when the..
Heat Loss
Heat loss is a phenomenon that occurs in the colder winter months, when the average exterior tempera..
Hard Coating
Also referred to as pyrolitic coating, hard coating is a process in which coating is fused to glass ..
Pyrolitic Coating
Also referred as hard coating. A process in which coating is fused to glass while the glass is still..
Heat Gain
Heat gain is a phenomenon that occurs in the warmer summer months, when the average exterior tempera..
Heat Soak Test
The heat soak test or heat soak process is used to minimize the risk of spontaneous breakage of heat..
Heat Strengthened Glass
Heat-strengthened glass refers to glass that is produced in a process similar to that for tempered g..
Inert Gas Window Fills
An improvement that can be made to increase the performance of IG units is to reduce the conductance..
Electrically Heated Glass
Electrically heated glass is a laminated glass, incorporating almost invisible electrically conducti..
Helios Project
The new solar plane named Helios has reached an altitude of 100.000 feet and set a new record for su..
History of Conservatories
The historical development of conservatories is unavoidably connected to the progress made in the ma..
Laser Glass-Cutting Technology
Conventional glass cutting is done by scoring and breaking, which produces micro-cracks and splinter..
History of Glass
Glass formed by the forces of nature has existed since the beginnings of time. It is formed when cer..
Hose Stream Test
The hose stream test is part of a series of tests that begins with heat testing of the glass. Manufa..
How to Handle and Store Curved Glass
Bent glass is simply flat glass that is heated to a specific temperature, at which point the glass s..
How to Handle Mirrors
Improper handling, storing and cleaning of mirrors may result in damage or quick deterioration of mi..
How To Save Energy With Windows
Building heat loss means increased energy costs. Much energy wasted occurs in the form of heat escap..
Hydrofluoric Acid
Hydrofluoric acid is a solution of hydrogen fluoride in water. Together with hydrogen fluoride, hydr..
Insulating Glass
Insulating glass is a multi-glass combination consisting of two or more panes enclosing a hermetical..
Impact Test
Safety glass is a type of glass that must pass an impact test in which glass cannot break or breaks ..
Importance Of Cooling Systems
While coolants are often an underrated factor, experts have demonstrated that the usage of coolants ..
Inclined Glazing
Glazing that is inclined either horizontally or sloping 75° from horizontal. Glazing inclined 15..
Inner Pane
A term describing the internal sheet of glass in a unit such as an IGU or laminated glass or any oth..
Insulating Glass Spacers
Insulating glass unit or double-glazed unit is one of the most common types of glass used today for ..
Insulation Value
R-value, synonimous of insulation value, is a term predominantly used in the building industry to de..
Intaglio Glass
Intaglio is a form of design/decoration where the picture is cut away below the surface of the glass..
Integrity Of Glass
The ability of glass to remain complete and not break down under specific conditions while providing..
Interlayer
The plastic layer between two sheets of glass in manufacture of laminated glass for safety, security..
K Value
The k-value, or heat transfer coefficient, is the measured value of the heat flow that is transferre..
Kiln
“Kiln” usually refers to an oven or furnace that operates at sufficiently high temperatu..
Krypton Gas
An inert (nonreactive), odorless, colorless, nontoxic gas that is approximately 12 times more dense ..
Laminated Glass
Laminated glass is a combination of two or more glass sheets with one or more interlayers of plastic..
Lead Glass
As the name implies, lead glass has a high percentage of lead oxide (at least 20% of the batch). Lea..
Leadlight
Leadlights are decorative windows made of small sections of glass supported in lead cames. The techn..
LED Glass
The use of transparent glass in conducting electricity using LEDs, short for “light emitting d..
Lehr
A glass annealing lehr is the final part of the production process in the manufacture of glass. An a..
Light-To-Solar Gain Ratio
Light-to-Solar Gain Ratio (LSGR) is one way to evaluate the relationship between VLT (Visible Light ..
Low Conductance Spacer
In order to overcome the problem of “cold-edges” caused by thermal leakage of classical ..
Low-E Coatings
Low-E coatings, originally developed to decrease heat flow (far infrared) through windows, have been..
Low-E Glass
Low-emission glass (Low-E) is a transparent to visible light and opaque to infrared radiation glass...
Magnetron Coating Deposition
The purpose of coatings is to alter glass properties. Several glass characteristics such as light tr..
Translucent
A glass property that allows light to be transmitted with varying degrees of diffusion so that visio..
Milk Glass
Milk glass is a opaque or translucent whitish glass. It is a relatively recent name for opaque, milk..
Mirror
Mirrors are commonly made of glass with a smooth, polished surface that forms images by the reflecti..
Murano Glass
Murano, an island located near Venice, is still today regarded as being synonymous with the producti..
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..
On Line Coating
Also referred to as pyrolitic coating, online coating is a process in which coating is fused to glas..
Otto Schott
Friedrich Otto Schott (born 17 December 1851 in Witten; died 27 August 1935 in Jena) was a German ch..
Passive Coating Material
A general term used to describe a characteristic of a coating that cannot react to an external stimu..
Patterned Glass
Patterned glass is an imperfectly smooth structure with different patterns impressed on it. The ..
Photovoltaic Glass
Photovoltaic glass is a special glass with integrated solar cells that convert solar energy into ele..
Plate Glass
Form of glass originally made by casting and rolling and characterized by its excellent surface prod..
Point-Fixed Glass
Fully glazed façade systems are currently very popular with architects and investors for thei..
Primary Seal
A term used in the production of IG units in reference to a butyl-based sealant applied to the edges..
Putty
A compound usually made by limestone and other material. It is soft and pliable and used as a gap fi..
PVB
PVB is a shortened form of polyvinyl butyral resin, also called PVB film or PVB interlayer. It is a ..
PVC Frames
PVC or vinyl frames are primarily made from polyvinyl chloride. This is highly effective insulating ..
Quartz Glass
Quartz glass is a clear vitreous solid, formed by melting pure quartz. It can withstand high tempera..
Radiation
A generic term which can mean several things depending on how it is used. It most commonly refers to..
Rebate
A part of the frame surround that forms an angle into which the glass is placed and held. ..
Reflective Glass
This is an ordinary float glass with a metallic coating to reduce solar heat. This special metallic ..
Resin Laminate
Any resin used in the production of laminated glass as the interlayer sandwiched between two pieces ..
Robotics in Glass
Robots are used to increase productivity and improve product quality since they work faster and with..
Rolled Process
A glass rolling process in which raw materials (soda lime glass, silica sand, calcium, oxide, soda, ..
Rolled Glass
Flat glass made by the rolled process where semi-molten glass is squeezed between metal rollers to p..
Safety Glass
A characteristic of glass that is treated or manufactured to reduce the hazard of cutting or causing..
Sandblasted Glass
Sandblasted glass is produced by spraying sand at high velocities over the surface of the glass. Thi..
Secondary Seal
A term describing a sealant that is applied to the edges of IG units after the primary seal. Because..
Security Glass
A characteristic of glass, usually laminated or multi-laminated glass that is designed to withstand ..
Self-Cleaning Glass
Self-cleaning glass is an ordinary float glass with a special photocatalytic coating. It is made by ..
Emile Fourcault
 Born with Saint-Jose-ten-Noode in 1862, resulting from the upper middle class carolorég..
Solar Control Coating
A specific coating that allows a certain amount of solar heat gain to be transmitted through it. Sol..
Containment
Term that describes the property of glass or glazing where it prevents the passage (falling) of peop..
Ultimate wind pressure (UWP)
The wind pressure or load at which failure of the integrity of the glazing can be expected. The same..
Shading coefficient
The total shading coefficient is a measure of the total amount of heat passing through a particular ..
Low Iron Glass
A type of glass that has very little iron in its chemical composition. This type of glass is extreme..
Shortwave radiation
The part of electromagnetic radiation (280 to 2500 nm wavelength) that is radiated by the sun. The m..
Solar Factor G
Total energy transmitted through glass...
Acoustic Laminate
The term refers to laminated glass assembled for the purpose of acoustic insulation. To obtain such ..
Back Clearance
Space between the back of the glass and back of the frame surround that forms an angle into which th..
Back Putty
That portion of the compound remaining between the back of the rebate and glass after the glass has ..
Bevel Both Sides
Bevel both sides is a process whereby both sides of edges are angled from some point on the surface ..
Bevel To Butt
The process of producing a cut edge of glass to an angle of approximately 45°; edges typically u..
Mitre Bevel
A process in which the edges of glass are beveled to an angle of approximately 45° (unless other..
Bite
The amount of overlap between the frame or fin support. Also referred to as structural bite, it is t..
Blemish
A term describing a noticeable imperfection on the surface of glass...
Bubble
A gas bubble trapped inside the float glass and obscure glass. In laminated glass, gas bubbles are p..
Bullion
A glass panel having a formed antique-style circle in its center for decorative effect. Originally t..
C.T.S.
Abbreviation for cut-to-size glass. ..
Cases
Wooden cases in which sheets of glass are packed. They are specially used for transporting and stori..
CIP
Abbreviation for cast in place. This is a process used in the manufacture of laminated glass. In the..
Cutter
Term for a worker who is in charge of cutting glass, or for a tool used to cut glass. ..
Deep Bite
A sandblasting technique in which an extra deep sandblast is used in order to create depth in an ima..
Distance Pieces
The term describing a section of resilient, nonabsorbent material used to prevent the displacement o..
Draw Lines
The direction of flow (or pull) of the glass during the production of sheet glass. Draw lines were p..
DXF File
A computer file that contains a specific shape or drawing. This file can be processed by the CNC mac..
Edge Block
Any type of barrier (block) that prevents the sideways movement of glass...
EI
Classification for insulation of fire resistant glass...
E
Classification for integrity of fire resistant glass...
EW
Classification for reduced heat radiation of fire resistant glass...
Equlibrium
A very general term used to describe a stable situation. In the glass sector it expresses the situat..
End Cap
Wooden boxes held onto the ends of a pack of glass with metal banding. One of the standard methods o..
Fading
A phenomenon in which when solar radiation enters the room it is absorbed by the exposed furnishings..
Sloped Overhead Glazing
Glazing that is sloped more than 15° from the vertical position. When sloped glazing is used ove..
Finishing
A very general term. Used mostly to refer to the final step in glass processing or cold-end working...
Face Miter
A process to the front surface of a pane of glass in which the edges of glass are beveled to an angl..
Faults
Any type of imperfection of glass, including bubble, blemish, bloom, seed, chip, and feather...
Fiery
Term describing a poorly annealed glass that resulted from poor cutting...
Face Clearance
Describes the distance between the glass and the rebate upstand. This is usually filled with a gaske..
Finger Slots
A process technique in which a slot is produced on the glass surface by grinding. The slot is used a..
Flat Ground Edge
A process in which the edges of the glass are completely flattened by a grinding machine, after whic..
Fins
Glass fins are used for supporting glass panels, usually vertical, located 90° to the glazed sur..
Flemish
A type of decorative obscure glass that contains a semitransparent directional pattern. This pattern..
Framing System
Term describing the type of material as well as the design type of the frame used to support the gla..
Frameless
A type of glazing system that is not supported by a frame on any of the edges. The alternative to fr..
Frail
A rack or frame used for supporting or securing glass during transportation. Frails are often used i..
Floatliner
A specially adapted truck that can carry jumbo-sized sheets of float glass positioned inside on a st..
Frit
A general term with several different meanings. Most commonly, a term that describes the procedure i..
Fritted
Sheet of float glass to which a screen printed pattern has been applied to form screen printed glass..
Fixing
Term with several meanings depending on the context in which it is used. Fixing can mean the method ..
Flare
A protrusion on the edge of a panel of a glass...
Flush Glazing
Glazing with no fixings or parts of the glazing system protruding beyond the outer surface of the gl..
G1/S
Obsolete British Standard Specification for bullet resistance properties in glass...
Glazing Platform
The horizontal leg of the rebate in a frame, upon which the glass is positioned when it is glazed...
Greenhouse Effect
A very general term used in reference to environmental issues and applied to the phenomenon of keepi..
Hand-Ball
A term used by a glass worker that describes loading or unloading glass sheets from a vehicle or to ..
Half Round
Type of working of the edge of glass in which a cut edge is rounded to a quarter circle...
Handling Glass
All activities involved in the transfer of glass from factory to storage area and to the building si..
Heat Transfer Coefficient
A unit of measure of the rate at which heat can cross a boundary or surface. This can be achieved by..
Silicone
Silicones are largely inert compounds with a wide variety of forms and uses. Typically heat-resistan..
Single Glazing
Single thickness of glass in a window or door. ..
Single-Strength Glass
Glass with thickness between 1/12 and 1/10 inch thickness—rarely found in newer windows for sa..
Smart Glazing
Smart glass or smart windows in its application to windows or skylights refers to electrically switc..
Snow Load
Because of their aesthetic and practical benefits, glazed roofs have become very popular. A heavy sn..
Soda-Lime Glass
This is the most common commercial glass (90% of total production), and also the least expensive. Th..
Soft Coating
Also referred to as sputtering, a method in which coating is applied to the glass in the off line pr..
Solar Factor
The solar factor (or g-value) measures the percentage of heat that passes through the glass. The low..
Solar Heat Gain
Solar gain (also known as solar heat gain or passive solar gain) refers to the increase in temperatu..
Solar Heat Gain Coefficient
The fraction of external solar radiation that is admitted through a window or skylight, both directl..
Transom
A transom refers to the horizontal member that is framed across a window, dividing it into stages or..
Solar Radiation
Solar radiation is radiant energy emitted by the sun from a nuclear fusion reaction that creates ele..
Sound Insulation
The need to restrict outside sound is not only a matter of environmental protection but, principally..
Space Bar
Space bars are used to form an IG unit.  They are placed between two sheets of glass to hold th..
Spall
Small fragments or pieces of glass that are ejected from one face of a pane of laminated glass when ..
Spandrel Glass
Today, different curtain wall systems allow the entire building exterior to be covered with glass. T..
Spectrally Selective Glazing
Spectrally selective glazing is window glass that permits some portions of the solar spectrum to ent..
Sputtering
Also referred as physical vapor deposition (PVD) or soft coating, sputtering is a process that works..
Sputtering Technology Process
The deposit of thin films is often used to change glass properties. For example, the optical propert..
Storage Glass
The selection of an appropriate system may save storage space and reduce the incidence of glass brea..
Structural Glazing
A term with multiple meanings. First, glass that is acting as a structural support to other parts of..
Structural Sealant Glazing
Any type of external glazing system where glass is bonded by the use of sealant to a frame without u..
Structural Silicone Glazing
In the past 30 years, structural silicone sealants have granted designers and architects the freedom..
Super Spacer
Super Spacer is a commercial name for one of the products derived from the warm-edge spacer concept...
Surface Coatings
Any mixture of film-forming materials plus pigments, solvents, and other additives, which, when appl..
Surface Treatment
Sulfur Dioxide (SO2). One of the earliest glass surface treatments was to expose the hot glass to su..
Tempered Glass
Tempering is a thermal or chemical treatment that compresses the surface layer of the glass, thus im..
Tempering
Toughened or tempered glass is glass that has been processed by controlled thermal or chemical treat..
Textured Glass
Textured glass is a rolled patterned glass, one surface of which has a specific pattern or design im..
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 Mass
Thermal mass, in the most general sense, is any material that has the capacity to store heat. When u..
Thermal Shock
Because of its chemical and mechanical properties, glass is vulnerable to rapid increase or decrease..
Thermal Stress
Window glass is heated and cooled by visible and invisible (infrared) radiation from the sun and oth..
Thermally Insulating Glazing
A method of producing glass sheets having good transmission behavior in the visible spectrum range a..
Thermally Toughened Glass
The thermal toughening of glass is employed to obtain a glass sheet with high surface tension in ord..
Tinted Interlayer
Interlayer for laminated glass that is tinted to give the glass solar control properties. The tints ..
Toughened Glass
Toughened glass is also called “tempered glass.” It is made by a process of heating glas..
Triple Glazing
Three layers of glass separated by air spaces to give improved thermal or acoustic insulation. As wi..
Types of Fire-Resistant Glass
Generally, any type of glass that can withstand the fire test and therefore resist passage of smoke,..
Types of Glass Transportation
Transporting glass from Point A to B is the final step for the glass manufacturer and processor. Spe..
U-Factor
The rate of heat loss is indicated in terms of the U-factor (U-value) of a window assembly. The insu..
UDL
Means uniformly distributed load on the glass or any other surface...
UV Transmittance
The ratio of the amount of total UV solar energy (300 to 380 nanometers) that is allowed to pass thr..
Vaseline
Glass that is the color of petroleum jelly, emits slight radioactivity, and glows neon green under u..
Visible Transmittance
Visible transmittance (VT) measures how much light comes through a product. VT is expressed as a num..
Vision Area
A generic term that refers mostly to a specific part of a building such as façade or curtain ..
Warm Edge
In order to overcome the problem of “cold-edges” caused by thermal leakage through class..
Warm Edge vs Aluminum Spacers
Insulating glass units or double-glazed units are the most common types of glass used today for buil..
Waterjet Cutting Technology
The waterjet machine, instead of the diamond wheel, uses water to cut glass. Waterjet cutting can be..
What Makes Glass Transparent?
In general, most liquids and gases—water, air, natural gas, cooking oil, or rubbing alcohol&md..
Wind Pressure
Wind has pressure due to its velocity. This pressure is calculated from the equation Vp = 0.6V²..
Wind Resistance
Ability of a glass surface to withstand specific wind load that is required in a specific project. D..
Window Frames
Window frames are available in many styles, and are made of different materials. When purchasing ene..
X-Ray Protection Glass
This is an amber-colored glass containing 70% lead oxide, which significantly reduces ionizing radia..
Heat Reflecting Glass
A normal glass that has been surface treated with a special coating to create a glass surface that r..
Hydrofluoric Acid
An acid that is used in the acid etching process. One of the few acids that can directly attack glas..
Horticultural glass
Term used for any glass used for glass houses and other horticultural applications. Most usually a c..
Hydrophilic
Term used for self cleaning glass in which the coating attracts water so that rain flows down the pa..
Photocatalytic
Photocatalytic means that the active integrated coating on the outside of the glass absorbs the sun&..
Imagelite
Term for a type of laminated glass. A laminate glass with a picture within the interlayer...
Infrared
Infrared radiation is radiation at a longer wavelength than visible light, which means it cannot be ..
Intumescent interlayer
A name for a special interlayer used in fire resistant laminated glass. With laminated glass that us..
Iridescence
Iridescence is an optical phenomenon that sometime occurs on glass surfaces. This optical effect can..
Aspect ratio
This term generally describes the ratio between two dimensions of an object. In glass terminology, t..
Double-Glazed Units
This leads to condensation of moisture between the two panes of glass. Condensation affects the cl..