Inspection Criteria
Flat Glass Inspection Criteria per ASTM C 1036 – 06
Terminology:
crush,—lightly pitted condition with a dull gray appearance.
dig,—deep, short scratch
dirt,—small particle of foreign matter embedded in the surface of flat glass.
gaseous inclusion,—round or elongated bubble in the glass.
linear blemish, —scratches, rubs, digs, and other similar imperfections.
point blemish, —crush, knots, dirt, stones, gaseous inclusions, and other similar imperfections.
rub, —abrasion of a glass surface producing a frosted appearance.
scratch,—damage on a glass surface in the form of a line caused by the movement of an object across and in contact with the glass
surface.
Inspection:
Visual inspection should be done with the naked eye. The inspector shall place the glass in a vertical position. Inspector shall view through the glass at an angle of 90º Lighting should be daylight level ( without direct sunlight) or other uniform backlight that simulates daylight.
View at the distance specified by defect type.
Quality Criteria:
Allowable Point Blemish, (viewing distance 39”)
Blemish size <1.2mm (0.05”) allowed without restriction.
Blemish size >1.2mm (0.05”) <2.0mm (0.10”) allowed with a minimum separation of 600mm (24”).
Blemish size >2.0mm (0.10”) none allowed.
To determine point blemish size, measure height and width of blemish and average. Only the point blemish is to be measured, and
not any distortion that may be present.
Allowable Linear Blemish, (viewing distance starting at 160”)
Faint or light scratch <75mm (3”) allowed.
Medium scratch
75mm (3”) allowed with a minimum separation of 600mm (24”)
Medium or heavy scratch >75mm (3”) are not allowed
Coated Vision Glass Inspection Criteria per ASTM C 1376 – 03
Terminology:
coating rub —a surface abrasion of appreciable width that has partial, or complete, removal of the coating producing a hazy appearance.
coating scratch —partial, or complete, removal of the coating along a thin straight or curved line.
corrosion —change in the color or level of reflected or transmitted light over all or part of the glass surface as a result of degradation of the coating from external sources.
crazing — a random conglomeration of fine lines or cracks in the coating.
mark/contaminant —a deposit of foreign material on the glass surface.
pinhole —small area in which the coating is entirely or partially absent.
Inspection:
Visual inspection should be done with the naked eye. The inspector shall place the glass in a vertical position with
light in transmission.
Inspector shall view through the glass at an angle of 90º from a distance of 10 ft. Lighting should be daylight level
(without direct sunlight) or other uniform backlight that simulates daylight.
Laminated Glass Inspection Criteria per ASTM C 1172 – 03
Terminology:
blow-in —a separation of glass and interlayer at or close to the laminate edge caused by penetration of the autoclaving medium into the edge during manufacturing.
boil (bubble) —a gas pocket in the interlayer material or between the glass and interlayer.
covered edge —the perimetric area of the laminate covered by the channel or sash when installed.
delamination —a condition in which one or two of the lites of glass loses the bond between the glass lite and the interlayer.
discoloration —a visibly noticeable color change (from original) in the appearance of a material.
edge boil —See boil (bubble).
exposed edge —the perimetric area of the laminate exposed to the environment after installation.
fuse —a glass particle or crystalline material that is permanently bonded to a surface of a lite.
hair —a slender, pigmented filament from human or animal epidermis or other thread-like filament.
inside dirt —foreign material trapped inside the laminate.
lint —short fibers of yarn or fabric trapped within the laminate.
scuff —See streak.
separation —an area of the laminate that has become delaminated (see delamination).
short interlayer —a condition of the laminate in which the interlayer does not extend to the edge.
streak —a noticeably visible deviation on or in the laminating unit.
Inspection:
For inspection of individual glass lites refer to ASTM C 1036-06
Coating related defects should be evaluated per ASTM C 1376 – 03.
Visual inspection should be done with the naked eye. The inspector shall place the glass in a vertical position
Inspector shall view through the glass at an angle of 90º Lighting should be daylight level (without direct sunlight) or other uniform backlight that simulates daylight.
Heat treated Glass Inspection Criteria per ASTM C 1048 – 04
Terminology:
bow/warp,—Curvature across the entire dimension(s) of the lite
crush,—lightly pitted condition with a dull gray appearance.
dig,—deep, short scratch
dirt,—small particle of foreign matter embedded in the surface of flat glass.
distortion,—Thermally tempered and heat-strengthened glass is made by heating glass in a furnace, the original flatness of the glass is slightly modified by the heat treatment, causing reflected images to be distorted.
gaseous inclusion,—round or elongated bubble in the glass.
linear blemish,—scratches, rubs, digs, and other similar imperfections.
point blemish,—crush, knots, dirt, stones, gaseous inclusions, and other similar imperfections.
rub,—abrasion of a glass surface producing a frosted appearance.
scratch,—damage on a glass surface in the form of a line caused by the movement of an object across and in contact with the glass surface.
strain pattern,—In heat-strengthened and fully tempered glass, a strain pattern, which is not normally visible, may become visible under certain light conditions.
Terminology:
crush,—lightly pitted condition with a dull gray appearance.
dig,—deep, short scratch
dirt,—small particle of foreign matter embedded in the surface of flat glass.
gaseous inclusion,—round or elongated bubble in the glass.
linear blemish, —scratches, rubs, digs, and other similar imperfections.
point blemish, —crush, knots, dirt, stones, gaseous inclusions, and other similar imperfections.
rub, —abrasion of a glass surface producing a frosted appearance.
scratch,—damage on a glass surface in the form of a line caused by the movement of an object across and in contact with the glass
surface.
Inspection:
Visual inspection should be done with the naked eye. The inspector shall place the glass in a vertical position. Inspector shall view through the glass at an angle of 90º Lighting should be daylight level ( without direct sunlight) or other uniform backlight that simulates daylight.
View at the distance specified by defect type.
Quality Criteria:
Allowable Point Blemish, (viewing distance 39”)
Blemish size <1.2mm (0.05”) allowed without restriction.
Blemish size >1.2mm (0.05”) <2.0mm (0.10”) allowed with a minimum separation of 600mm (24”).
Blemish size >2.0mm (0.10”) none allowed.
To determine point blemish size, measure height and width of blemish and average. Only the point blemish is to be measured, and
not any distortion that may be present.
Allowable Linear Blemish, (viewing distance starting at 160”)
Faint or light scratch <75mm (3”) allowed.
Medium scratch
75mm (3”) allowed with a minimum separation of 600mm (24”)
Medium or heavy scratch >75mm (3”) are not allowed
Coated Vision Glass Inspection Criteria per ASTM C 1376 – 03
Terminology:
coating rub —a surface abrasion of appreciable width that has partial, or complete, removal of the coating producing a hazy appearance.
coating scratch —partial, or complete, removal of the coating along a thin straight or curved line.
corrosion —change in the color or level of reflected or transmitted light over all or part of the glass surface as a result of degradation of the coating from external sources.
crazing — a random conglomeration of fine lines or cracks in the coating.
mark/contaminant —a deposit of foreign material on the glass surface.
pinhole —small area in which the coating is entirely or partially absent.
Inspection:
Visual inspection should be done with the naked eye. The inspector shall place the glass in a vertical position with
light in transmission.
Inspector shall view through the glass at an angle of 90º from a distance of 10 ft. Lighting should be daylight level
(without direct sunlight) or other uniform backlight that simulates daylight.
Laminated Glass Inspection Criteria per ASTM C 1172 – 03
Terminology:
blow-in —a separation of glass and interlayer at or close to the laminate edge caused by penetration of the autoclaving medium into the edge during manufacturing.
boil (bubble) —a gas pocket in the interlayer material or between the glass and interlayer.
covered edge —the perimetric area of the laminate covered by the channel or sash when installed.
delamination —a condition in which one or two of the lites of glass loses the bond between the glass lite and the interlayer.
discoloration —a visibly noticeable color change (from original) in the appearance of a material.
edge boil —See boil (bubble).
exposed edge —the perimetric area of the laminate exposed to the environment after installation.
fuse —a glass particle or crystalline material that is permanently bonded to a surface of a lite.
hair —a slender, pigmented filament from human or animal epidermis or other thread-like filament.
inside dirt —foreign material trapped inside the laminate.
lint —short fibers of yarn or fabric trapped within the laminate.
scuff —See streak.
separation —an area of the laminate that has become delaminated (see delamination).
short interlayer —a condition of the laminate in which the interlayer does not extend to the edge.
streak —a noticeably visible deviation on or in the laminating unit.
Inspection:
For inspection of individual glass lites refer to ASTM C 1036-06
Coating related defects should be evaluated per ASTM C 1376 – 03.
Visual inspection should be done with the naked eye. The inspector shall place the glass in a vertical position
Inspector shall view through the glass at an angle of 90º Lighting should be daylight level (without direct sunlight) or other uniform backlight that simulates daylight.
Heat treated Glass Inspection Criteria per ASTM C 1048 – 04
Terminology:
bow/warp,—Curvature across the entire dimension(s) of the lite
crush,—lightly pitted condition with a dull gray appearance.
dig,—deep, short scratch
dirt,—small particle of foreign matter embedded in the surface of flat glass.
distortion,—Thermally tempered and heat-strengthened glass is made by heating glass in a furnace, the original flatness of the glass is slightly modified by the heat treatment, causing reflected images to be distorted.
gaseous inclusion,—round or elongated bubble in the glass.
linear blemish,—scratches, rubs, digs, and other similar imperfections.
point blemish,—crush, knots, dirt, stones, gaseous inclusions, and other similar imperfections.
rub,—abrasion of a glass surface producing a frosted appearance.
scratch,—damage on a glass surface in the form of a line caused by the movement of an object across and in contact with the glass surface.
strain pattern,—In heat-strengthened and fully tempered glass, a strain pattern, which is not normally visible, may become visible under certain light conditions.
SITE INSPECTION OF INSTALLED GLAZED UNITS
Based upon EN 1096, as as defined within the Guardian Technical Guidelines Handbook
Based upon EN 1096, as as defined within the Guardian Technical Guidelines Handbook