Acute areaAn approximately 8-1/2″ wide by 11′ high area starting at the top of the steering wheel encompassing the area which is directly in front of the driver.

Bottom of crackThe very fine visible hairline running along the lamination.

Bullseye of stone breakThe dark circle encompassed by and surrounding the impact point.  Typically any small radiating clucks will converge into the bullseye.  This is an open air space.  The darkness is caused by light refraction in this open area.

Cosmetic blemishSmall voids or air bubbles in the interior of any repair which appears as light refraction or dark spots.  This specifically excludes the impact point.

CrackA single line of separation in the outer layer of glass, with a microscopic gap, widest at the edge and narrowest at the point.

DelaminationLamination deterioration usually exhibiting a foggy, whitish or yellowish appearance.

DeteriorationA tensile or adhesion failure of the resin which appears as an area not repaired or exhibiting refraction.

Edge of crackWhere the crack meets one of the four sides of the windshield. This is the widest, most stressful part of the crack.  If not properly repaired, deterioration may begin in this area.

Extending crackA leg of a stonebreak extending past the outer circumference of the bullseye, less than 3″ in length.

Head-on angleThe view of the crack which is perpendicular to the profile of the crack. The head-on angle is a “seam” and is always visible at the conclusion of a repair.  This angle is not used by the technicians when repairing damage and is not a valid angle from which to determine the quality of a repair for inspection purposes.

Horizontal crackA short or long crack which commonly runs to the edge of the left or right side of the windshield.  Also included would be unsurfaced cracks.  A repair of this type may be acceptable across the acute area, provided that it does not contain any cosmetic blemishes as defined in these guidelines nor hinder the driver’s vision.

Impact pointThe actual location on the outside layer of glass which was struck, usually by a stone.  Typically, a small piece of glass is missing.  The impact point is the location for the chemical’s passage into the break.  It is the size of this area of missing, or pulverized glass that generally determines the visibility of the resulting repair.

Interior of crackThe largest area of the crack in between the top and bottom which is filled with the repair chemical.  In a proper repair, this area should be clear, when viewed from the profile.

L-shaped crackA short or long crack which typically comes off an edge and changes direction after a few inches.

LegReference to a single crack usually less than 3″ in length which emanates from the initial bullseye of the stone break.  Star breaks are so called because of the multiple legs emanating from the center.

Long crackA crack over 6″ in length and usually surfaced.  Tri Glass offers a long crack repair resin and may be substituted for one of the other resin that are included in your windshield repair kit at no additional charge.

Good windshield repair starts with quality windshield repair kits, tools, resin, and techniques.  Please call Tri Glass if you have any questions.