Annealing:In the manufacturing of float glass, it is the process of controlled cooling done in a lehr to prevent residual stresses in the glass. Re-annealing is the process of removing objectionable stresses in glass by re-heating to a suitable temperature followed by a controlled cooling.
Air Infiltration:The amount of air leaking in and out of a building through cracks in walls.
ARG:Automotive replacement glass.
Argon:An inert, nontoxic gas used in insulating windows to improve the insulating value of sealed glass units.
Barrier-Free:In terms of handicap access, this refers to an enclosure system that has minimal or no bottom track and openings that are wheelchair-accessible.
Bed or Bedding:In glazing, the bead of compound or sealant applied between a lite of glass or panel and the stationary stop of sight bar of the sash or frame. It is usually the first bead of compound or sealant applied when setting glass or panels.
Bead:A sealant after application in a joint such as caulking bead, glazing bead, etc.
Bent Glass:Flat glass that has been shaped while hot into cylindrical or other curved shapes.
Beveling:The process of edge finishing flat glass to a bevel angle.
Bi-Fold:A door that fold in the middle, usually having one end in a fixed position while the other runs along a guied track.
Borosilicate Glass:A high silicate glass that has at least 5% boron oxide.
Bow (Warp):A curve, bend or other deviation from flatness in glass.
Breather Tube:A device added to an insulationg glass unit that allows excess pressure to bleed off to the atmosphere. (only required for high altitudes (over 4,000').
Bubbles:In laminated glass, a gas pocket in the interlayer material or between the glass and the interlayer. In float glass, a gaseous inclusion greater than 1/32" in diameter.
Buttress (Tile Rise):The raised portion of a shower curb that is on more than one level.
Butt Glazing:The installation of glass products where the vertical glass edges are without structural supporting mullions.
Bypass:A door consiting of two or more panels that run in parallel tracks.
Caulk:The application of sealant to a joint, crack or crevice. A compound used for sealing that has minimum joint movement capability; sometimes called low performance sealant.
Clear Glass:Glass that is transparent.
Condensation:The accumulation of water vapor from the air's humidity on any cold surface whose temperature is below the dew point, such as cold window glass or frame that is exposed to humid indoor air. Low conductivity or warm edge spacers reduce condensation.
Continuous Hinge Door:A shower door that has a full-length continuous metal hinge on the side of the door.
Curb:A raised edge or border of a shower, usually made of tile, marble or fiberglass.
Curtainwall:An exterior building wall which carriers no roof or floor loads and consists entirely or principally of metal or a combination of metal, glass and other surfacing materials supported by metal framework. There are two basic types. Custom: Walls designed specifically for one project and using parts and details specially made for this purpose. Standard: Walls made up principally of parts and details standardized by their manufacturer and assembled in accordance with either the architects design or the manufacturer's stock patterns.
Curved Glass:Glass that has been specially formed to fit into a circular floor plan.
Custom Enclosure:An enclosure that requires specially cut glass and framework.
Cut Sizes:Glass cut to specified width and height or length.
Cutting:Scoring glass with a diamond, steel wheel, or other hard alloy wheel and breaking it along the score. Other methods of cutting glass include water jet and laster.
Dead Load:Load force due to glass weight.
Deflection (Center of Glass):The amount of bending movement of the center of the glass lite perpendicular to the plane of the glass surface under an applied load.
Desiccant:An extremely porous crystalline substance used to absorb moisture from within the sealed air space of insulating glass units.
Distortion:Alteration of viewd images caused by variations in glass flatness or inhomogeneous portions within the glass. An inherent characteristic of heat-treated glass.
Double Glazing:Any use of 2 lites of glass, separated by an air space, within an opening, to improve insulation against heat transfer an/or sound transmission. In insulation glass units, the air between the glass shets is thoroughly dried and the space is sealed, eliminating possible condensation and providing superior insulating properties.
Double Strength:In float glass, approximately 1/8" (3mm) thick.
Drip Channel (Drip Trough):A metal channel that is designed to prevent water running down the door from dripping onto the floor when the door is opened.
Dry Glazing:A method of securing glass in a frame by use of a dry, preformed resilient gasket, without the use of a compound.
Edgework:Grinding the edge of flat glass to a desired shape or finish.
Egress Size:A window unit that is sufficient to allow a minimum square foot sash opening to meet BOA or local code requirements.
Electrochromic:Mirror that senses light and automatically dims. There will typically be a small pencil eraser sized dot at the bottom center of the glass.
Emissivity:The measure of a surface's ability to emit long-wave infrared radiation.
Encap (Encapsulated):Glass that is surrounded by a moulding.
Encapsulation:Injection molding around the perimeter of an AG part.
Etched Glass:Glass that has had a pattern cut into its surface, usually by an acid treatment.
Exterior Glazed:Glass set from the exterior of the building.
Fenestration:Any glass panel, window, door, curtainwall, or skylight unit on the exterior of a building.
Float Glass:Glass fomed on a bath of molten tin.
Flush Glazing (Pocket Glazing):The setting oa piec of glass or panel into a four-sided sash or frame opening containing a recessed "U" shaped channel withough removable stop on three sides of the sash or frame and one channel with a removable stop along the fourth side.
Fixed Panels:The glass or plastic panels of an enclosure that do not move.
Framed:A bath enclosure system that mounts all glass or plastic panels in a metal frame.
Frameless:A bath enclosure system that minmizes the amount of metal used to hold the system panels and door in place.
Gas Filled Units:Insulationg glass units with a gas, other than air, in the air space to decrease the unit's thermal conductivity (U-value) or to increase the unit's sound insulating value.
Glass:A hard brittle substance, usually transparent, made by fusing silicates, under high temperatures, with soda, lime, etc.
Glazing:A generic term used to describe an infill material such as glass, panels, etc.
Grids:Colonial square and diamond patterns between the glass. These are also called muntins or grilles.
Heat-Absorbing Glass:Glass for intercepting appreciable portions of radiant energy, especially solar energy (Transmittance values as defined in ASTM C 1036). It is obtainable as float and patterned glass.
Heat-Strengthened Glass:Glass that has been heat-treated to a state less than that of fully tempered glass. Specified by ASTM 1048 (Kind HS) as having a surface compression of not less than 3,500 pounds per square inch (psi) or an edge compression of not less than 5,500 psi. Heat-strengthened glass is approximately two times as strong as annealed glass of the same thickness and has much increased thermal endurance. Heat-strengthened glass is approximately two times as strong as annealed glass of the same thickness and has a much increased thermal endurance. Heat-Strengthened glass is also considered a safety glass and will not completely dice as fully tempered glass.
Heated AG Parts:Parts which have a heater grid (backlights) or metallic coating (windshields) used to defrost the part.
Heated Wiper Park Area:The windshield contains a heater grid across the lower part of the glass.
Heads Up Display (HUD):Technology in which the vehicle's instrument readings are projected onto the windhsield. The replacement windshield for vehicles with HUD is more expensive than thos which are not HUD equipped.
Heavy Glass:Glass used in many European-style frameless enclosures. Usually 3/8-inch or 1/2-inch in thickness.
Hermetically Sealed Unit:An insulating glass unit made up of two liters of glass, seperated by a spacer, or equivalent product (at the full perimeter), which is filled with a moisture absorbing material. The unit is then completely sealed, creating a moisture-free, clean, dead-air space.
Hinge Door:A shower door that usually has a jointed metal hinge on the side of the door.
In-Line Panels:Fixed panels that are "in a line" with the shower door.
Insulating Glass:Insulating glass refers to two pieces of glass spaced apart andhermetically sealed to form a single glazed unit with an air space between. Heat transmission through this type of glass may be as low as half withough such an air space. It is also known as Double Glazing.
Jamb:Thickness of the wall from the inside surface of the house to the outside surface of the house.
Laminated Glass:Glass that has been made by uniting layers of glass in order to increase the strength of the glass.
Lite:Another term for a pane of glass used ina window.
Light Sensor:A sensor usually located on the windshield that senses the absence of light and turns the head lights on automatically.
LOW-E or Low-Emissivity: Is to have a low rate of emitting (radiating) absorbed radiant energy. The radiant energy (heat) is, in effect, re-radiated toward its source.
Magnetic Latch:A latch that holds the door shut through the use of magnets.
Mullion:An intermediate connecting member used to "marry" two or more windows or patio doors together in a single opening withough sacrificing air or watertight performace. A mullion also can give aded strength to connections for structural stability.
Muntin:Horizontal or vertical bars or paint that divide the sash frame into smaller lites of glass.
Neo-Angle:A shower that consists of a center door with a fixed panel at an angle on either side of the door.
Non Conductive:Urethane adhesive that prevents the flow of electricity between the glass and metal of body, some manufactures mandate this urethane to prevent degradation of performance to electrical systems built into the glass such as antennas, cell phones, etc.
Obscure Glass:Glass that lets light through, but is not totally transparent.
Patterned Glass:Glass that has a repeating shape embedded in the glass. This type of glass is used extensively for light control and decorative glazing.
Pinchweld:The metal flange in the vehicle opening where AG is installed.
Pivot Door:A shower door that rotates on two metal pivots on the top and bottom of the door.
Picture Window:A window unit with a stationary sash that does not operate.
Polished Wired Glass:Wired glass that has been ground and polished on both surfaces.
Powdercoat:A technique for applying paint to aluminum shower door frames. The aluminum is covered with a powder of dry paint particles and is then baked in an over. This causes the powder to melt and then harden into a tough, colorful finish.
Privacy Parts:Description used for parts which have a coating added to the exterior surface of the glass to produce a mirror like reflection when viewed from the outside of the vehicle. See NAGS Catalog for complete listing and definitions.
Pyrolytic Coating:A coating applied during the manufacturing of the glass itself. Because they are actually part of the glass sheet, pyrolythic or "hard coat" surfaces are very durable and require no special handling.
R-value:The higher the R-value, the less heat is transmitted throughout the glazing material.
Rain Sensor:Sensor usually located on the windshield that senses rain and turns the wipers on or automatically adjusts the speed of the wipers.
Reflective Glass:Glass that bounces back at least some of the light that strikes it.
Return Panels:Fixed panels that are set at a 90...angle to the shower door.
Rolled Glass:Glass formed by rolling including patterned and wired glass. As glass is drawn horizontally from the tank, figured, engraved, and etched, machine rolls impress a pettern on the surface of the glass, varying from almost smooth to deeply marked geometric, fluted, or randome overal designs. It is made 1/8-inch to 3/8-inch thickness.
Rough Opening:The opening in a wall in which a window or door is to be installed.
Sandblasted Finish:A surface treatment for flat glass obtained by spraying the glass with hard particles to roughen one or both surfaces of the glass.
Sash:The portion of the window that holds the glazing, usually the portion of the window that operates.
Seeds:Minute bubbles in float glass less than 1/32" in diameter.
Shading Coefficient:The ratio of solar heat gain passing through a glazing system to the solar heat gain that occurs under the same conditions if the window were made of clear, unshaped double strength window glass. The lower the number, the better solar shading qualities of the glazing system.
Sloped Glazing:Any installation of glass that is at a slope of 15 degrees or more from vertical.
Solar Control Glass:Tinted and/or coated glass that reduces the amount of solar heat gain trasmitted through a glazed product.
Spacers:(Shims) Small blocks of composition, neoprene, etc., placed on each side of lites or panels to center them in the channel and maintain uniform width of sealant beads.
Spandrel:the panel(s) of a wall located between vision areas of windows which conceal structural columns, floors, and shear walls.
Spandrel Glass:Heat-strengthened flat glass with a colored-ceramic coating adhered to the back by a heat fusion process. It has double the strength of annealed glass of the same sieze and thickness, enabling it to withstand greater uniform loads and thermal stresses. Spandrel glass cannot be re-cut after heat strengthening. It is used as a fixed opaque colored glass on buildings in front off floor slabs and columns. It is available in a wide array of colors.
Silk-Screened Glass:Glass that has graphic images silk-screened on the surface to give the illusion of etched, textured or patterned glass.
Sputter Coating:A micro-thin metallic oxide coating vacuum-deposited on the surface of glass after manufacturing. Sputter coatings are vulnerable to moisture and abrasion and must be enclosed in sealed insulating window units.
Stain:Attack of a glass surface by water or other solutions involving: Leaching of sodium ions to the surface of the glass, an increased in pH on the glass surface, or the breaking of silica bonds in the glass structure.
Steam Bath:An enclosure that is usually equipped with special plumbing to create steem. The enclosure itself either runs from the floor to the ceiling or has a top (Transom Panel) to contain the steam.
Tempered Glass:Glass that has been annealed or strengthened by a process of gradually heating and cooling. Once a piece of glass has been tempered it cannot be cut. If it breaks, it breaks into many small pieces. By code, all glass shower doors and enclosures must be tempered glass.
Textured Glass:Glass that has been made with a texture on its surface to creates a translucent effect.
Tile Rise (Buttress):The raised portion of a shower curb that is on more than one level.
Tinted Glass:Glass that has a color running through it.
Total Solar Transmittance:The percent of incident solar radiation that directly passes through a glazing system.
Transom Panel:A panel usually located above the door of an enclosure. Can be used to keep steam inside of a steam-shower unit. Some open to vent steam.
U-Value:A measurement of heat transfer due to outdoor/indoor temperature differences. It is used almost exclusively to describe the heat loss through a material. Technically, it represents the amount of heat passing though a square foot of glass in one hour for every 1 degree Fahrenheit temperature difference. The lower the U-value, the less heat transfer.
United inches:Total of the width and height of the frame opening expressed in full inches
Urethane:An adhesive/sealant system or "kit" used on late model vehicles for glass installations which are required to enhance the strength of the installation and/or the overall structural integrity of the vehichle.
Visible Light Transmission:The percent of total visible light that passes though a glazing system.
Weather-stripping:A material or device used to seal the opening between sash and/or sash and frame.
Windload:Forece exerted by winds on building panels and completed structures; may be inward (positive) or outward(negative). Outward forces generally occure on the leeward sides of buildings.
Windshield:The front window in a vehicle which is made of laminated safety glass.
Wire Glass:Rolled glass with a layer of meshed or stranded wire completely imbedded. The wire restrains the fragments from falling out of the frame when broken.
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