Windshield Repair and Replacement

Auto Glass Terms


Roof support member adjacent to the windshield.


The clinging or sticking together of two surfaces, especially dissimilar substances like glass and metal. The state in which two surfaces are held together by forces that interface.


Any substance, inorganic or organic, natural or synthetic that is capable of bonding other substances together by surface attachment. The bonding agent used to adhere replacement auto glass to your vehicle.


The Automotive Glass Replacement Safety Standards (AGRSS™ ) Council Inc, (AGRSS™ ) is a not-for-profit organization dedicated to the safe replacement of auto glass. AGRSS™ was founded and is supported by companies in the auto glass replacement industry that keep safe installation as their primary goal.


The American National Standard Institute, which is a private, non-profit organization that coordinates a voluntary consensus standardization system.

Anti-Theft Vehicles:

Vehicles equipped with an anti-theft device or with laminated tempered glass, which prevents breaking.


Roof support member immediately behind driver door glass.


Back glass (or back car window)


Trademark/logo sandblasted or painted on glass that provides manufacturer information.

Ceramic Frit:

Ceramic paint band baked onto edge of glass.

Combination Crack:

Type of windshield damage often repairable when less than a quarter in diameter.


Side view mirror


To set up or harden by means of a chemical reaction

Cure Time:

The time required for a chemical reaction or material to dry set at a given temperature; it varies with the type of material used and the thickness of the product, etc.


The process of precisely cutting out and removing a damaged windshield.


Occurs when glass separates from the vinyl inner layer. (you windshield is 2 pieces of glass that are laminated together using PVB Laminate)


A defect in an auto glass part which causes a haze, ripple, wave or other visual imperfection, which is more common in aftermarket parts.

Dot Matrix Pattern:

If you have ever looked at the edge of your windshield, these are the small dots along your frit band (the outer edge of the windshield that is painted)

D.O.T. Number:

Department of Transportation Code – referring to the manufacturer of the part and must be displayed within the bug according to federal law.

Drive-Away Time:

Safe drive-away time (SDAT) defines the amount of time that your car is required to remain out of service until the auto glass part installed can properly operate as a safety device.

Encapsulated Glass:

Glass parts surrounded by moldings or frames.


Federal Motor Vehicle Safety Standards, set by the National Highway Traffic Safety Administration, which detail the safety criteria manufacturers must meet in order to conform to regulations. The complete, current regulations may be found here Federal Motor Vehicle Safety Standards and Regulations.

Flat Laminated Glass:

Laminated glass sold in sheets to be cut to fit a variety of openings.


See ceramic frit.


A channel or frame, usually made of rubber, which holds glass parts in place.

Glass Color

Almost all auto glass is tinted with a specific color, which is typically blue, green, gray or bronze. To determine which color is in your vehicle, simply hold a piece of white paper behind your auto glass.

Hairline Crack:

A long crack in a windshield that resembles a single piece of hair.


A cloudy defect in auto glass.

Heads-Up Display (HUD)

A feature in a windshield that will allow the dashboard measurements to be projected up on the glass to prevent the driver from having to look away from the road to monitor vehicle performance.

Heated Backlite:

A backglass with defroster gridlines printed on the glass to defrost or defog the back glass.


An auto glass part that can directly replace another auto glass part, by having exactly the same dimensions.

Keyless Entry :

Vehicles with this feature have an antenna on the rear windshield for the keyless entry system.

Laminated Glass:

Any glass construction with a plastic layer between two pieces of glass typically used in windshield applications.

Light Sensor :

A sensor, usually located in the windshield, that senses the absence of light and turns the headlights on.

Mirror Button:

Hardware used to hold rear-view mirror on windshield.


Is the decoration around the ege of your glass so you do not see the egde, it is not a seal. As of recent many manufactures have done away with moldings and have been making open air sets, which allows for a more modern apperance to your vehicle.


National Auto Glass Specifications, Inc – Assigns auto glass part numbers and auto used industry wide.


Original Equipment Manufacturer, in the auto glass industry refers to auto manufacturers.

Paint Band:

Black or grey paint band on perimeter of glass used to hide all the perimeter mechanics when installed in the vehicle. Typically ceramic.

Pinchweld :

A metal flange extending from the body of an automobile into the opening for auto glass parts from the side pillars and roof. This is the part of the vehicle frame where the adhesive is applied to bond the glass to the vehicle.

(PVB) Poly Vinyl Butyral:

Vinyl inner layer of laminated glass.

(PVC) Poly Vinyl Chloride:

A thermoplastic resin used for making moldings. Can also be used to encapsulate glass.


A material used to prepare auto glass surfaces for bonding to insure strong installation bond.

Privacy Glass :

Dark glass used behind the B-Pillar on vans and sport utility vehicles to prevent looking in. Also reduces ultraviolet and infrared rays and improves appearance.

Quarter Glass :

The quarter glass, is glass found on the side of the vehicle closest to the back glass.

Rain Sensor :

A sensor, usually located on the windshield, that senses rain and turns the wipers on automatically.


Typically refers to a windshield repair which uses a resin and vacuum technique that is used to seal damage in a windshield and prevent it from spreading.

Resin :

A clear liquid hardener used in rock chip or crack repair of a windshield. Once it has filled the chip or crack, it is cured with ultraviolet light to prevent further damage to the windshield.

Screen Print:

Method for applying paint band or monograms to glass by the silk screening process.

Shade Band:

See shaded glass.

Shaded Glass:

A windshield to which a darker color has been added to the top section of the inner vinyl layer to improve driver visibility in glare.


Window and frame assembly which is generally used as the back glass for pick-up trucks, but can also be on vans. The window opens by sliding in a track within the frame assembly.

Solar Glass:

Glass that blocks out the sun’s harmful infrared and UV rays to protect the automobile interior, and keeps vehicle cooler.

Spider Crack :

Glass damage with several crack lines projecting from one impact point. Spider cracks occur on windshields only.

T Part:

Flat laminated or tempered part with assigned NAGS number and cutting pattern (also known as DT, FT, DL or FL parts)

Tempered Glass :

An extra stong piece of glass made by rapid cooling which can be used for all vehicle glass except the windshield.

Tinted Glass:

Glass to which a small amount of color has been added consistently throughout the glass.

Tinting Film:

Plastic film of varying darkness, which is adhered to glass to simulate privacy glass.

Ultraviolet light (UV):

Part of the light spectrum. An ultraviolet light is used during the windshield repair process.


A powerful adhesive used to bond the glass to the frame of the vehicle.

Vehicle Make:

This is the brand of vehicle that you drive. Examples are Acura, Chrysler, Ford, GMC, Infinity or Toyota.

Vehicle Model :

This is the type of vehicle that you drive. Examples are the Acura Integra, Ford Mustang or Toyota Camry.

Vent :

The vent glass( usually triangular in shape) is glass found on the side of the vehicle which opens with the vehicle doors. Does not have to open to be called a vent.

V.I.N. :

The Vehicle Identification Number, or VIN, is a unique 17-digit number assigned to each vehicle that identifies year, make, model, etc.

V.I.N. Notch:

Cut away in the paint band on a windshield to reveal VIN plate on vehicle dash board.

Windshield :

A piece of laminated glass used to protect the inside of the vehicle from the elements, as well as promote the structural integrity of the vehicle.

Windshield Repair:

A technique that is used to repair damage in a windshield, such as a crack, nick, chip or ding, and prevent it from spreading.


National Glass Association, the largest trade association specifically for the North American glass industry. NGA represents the architectural, automotive and specialty glass segments of the industry. Its mission is to provide information and education and to promote quality workmanship, ethics and safety in the glass industry.

Nitrile Gloves

Surgical-grade, latex-free synthetic rubber gloves used to prevent oils and dirt from the hands contaminating glass surfaces. Nitrile gloves protect hands from harmful primer, prep and adhesive chemicals.

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