ASTM C1376-97
(Specification)Standard Specification for Pyrolytic and Vacuum Deposition Coatings on Glass
Standard Specification for Pyrolytic and Vacuum Deposition Coatings on Glass
SCOPE
1.1 This specification covers the optical and aesthetic quality requirements for coatings applied to glass for use in building glazing.
1.2 The coatings covered are applied to the glass using either pyrolytic or vacuum (sputtering) deposition methods and are typically applied to control solar heat gain, energy performance, comfort level, and condensation and enhance the aesthetic of the building.
1.3 This specification addresses blemishes related to the coating only. It does not address glass blemishes, applied ceramic frits, and organic films.
1.4 Dimensional values are stated in inch-pound units and are to be regarded as the standard units for this specification. The metric units given in parentheses are for information only.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 1376 – 97
Standard Specification for
Pyrolytic and Vacuum Deposition Coatings on Glass
This standard is issued under the fixed designation C 1376; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2.1 banding—Linear nonuniformity that may be wide or
narrow and occur anywhere on a lite.
1.1 This specification covers the optical and aesthetic qual-
ity requirements for coatings applied to glass for use in
NOTE 2—The following terms are designed to guide the user to the
building glazing. appropriate inspection charts and requirements.
1.2 The coatings covered are applied to the glass using
3.2.2 coated overhead glass—glass used in an installation in
either pyrolytic or vacuum (sputtering) deposition methods and
which the lower edge of the glass is more than 6 ft (1.8 m)
are typically applied to control solar heat gain, energy perfor-
above (the viewer’s) floor level or cannot be approached within
mance, comfort level, and condensation and enhance the
10 ft (3.0 m); the glass can usually but not always be viewed
aesthetic of the building.
in both transmission and reflection; the glass is usually sloping
1.3 This specification addresses blemishes related to the
in from the vertical plane, however, may also be vertical or
coating only. It does not address glass blemishes, applied
sloping out from the vertical plane.
ceramic frits, and organic films.
3.2.3 coated spandrel glass—glass used in an installation in
1.4 Dimensional values are stated in inch pound units and
which the glass is only viewed in reflection from the building’s
are to be regarded as the standard units for this specification.
exterior. The glass is usually installed vertically, however, may
The metric units given in parentheses are for information only.
be at a slope to the vertical plane.
3.2.4 coated vision glass—glass used in an installation in
2. Referenced Documents
which the lower edge of the glass is a maximum of 6 ft (1.8 m)
2.1 Reference to these documents shall be the latest issue
above (the viewer’s) floor level; the glass can be viewed in
unless otherwise specified by the authority applying this
transmission or reflection; the glass is usually vertical, how-
specification.
ever, may also be sloping in or out from the vertical plane; and
2.2 ASTM Standards:
the glass can be approached within 10 ft (3.0 m) or less. (If the
C 162 Terminology of Glass and Glass Products
distance is greater than 10 ft (3.0 m), see coated overhead
C 1036 Specification for Flat Glass
glass.)
C 1048 Specification for Heat-Treated Flat Glass—Kind
3.2.5 coating rub—a surface abrasion of appreciable width
HS, Kind FT Coated and Uncoated Glass
that has partial, or complete, removal of the coating producing
D 2244 Test Method for Calculation of Color Differences
a hazy appearance.
from Instrumentally Measured Color Coordinates
3.2.6 coating scratch—partial, or complete, removal of the
coating along a thin straight or curved line.
3. Terminology
3.2.7 corrosion—change in the color or level of reflected or
3.1 Definitions—Refer to Terminology C 162, Specification
transmitted light over all or part of the glass surface as a result
C 1036 or Specification C 1048 as appropriate:
of degradation of the coating from external sources.
3.1.1 blemishes in flat glass—refer to Specifications C 1036
3.2.8 crazing—a random conglomeration of fine lines or
or C 1048, as appropriate.
cracks in the coating.
NOTE 1—These definitions do not apply to in-service damage. 3.2.9 cut size—flat glass sheets cut to specific dimensions.
3.2.10 edge to edge—gradient nonuniformity within a lite
3.2 Definitions of Terms Specific to This Standard:
of glass.
3.2.11 lite to lite—nonuniformity between individual lites.
3.2.12 mark/contaminant—a deposit of foreign material on
This specification is under the jurisdiction of ASTM Committee C-14 on Glass
and Glass Products and is the direct responsibility of Subcommittee C14.08 on Flat
the glass surface.
Glass.
3.2.13 mottling—splotchy or patchy nonuniformity (not to
Current edition approved Oct. 10, 1997. Published February 1998.
2 be confused with strain pattern inherent to heat-treated glass or
Annual Book of ASTM Standards, Vol 15.02.
Annual Book of ASTM Standards, Vol 06.01. in-service staining, or both, or damage of glass).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C1376–97
TABLE 1 Quality Specifications for Cut Size Coated Vision Glass
3.2.14 nonuniformity—obvious variation in reflected color
A
(Kind CV)
of the coating within a lite of glass or between two lites of
B,C D D
Blemish Central Area, in. (mm) Outer Area, in. (mm)
coated glass in the same building or both.
1 3
Pinhole ⁄16 (1.6) max ⁄32 (2.4) max
3.2.15 picture framing—perimeter nonuniformity.
3.2.16 pinhole—small area in which the coating is entirely
1 3
Spot ⁄16 (1.6) max ⁄32 (2.4) max
or partially absent.
Coating scratch 2 (50) max length 3 (75) max length
3.2.17 pyrolytic—term used to describe a method of manu-
facture of a coating. Process applies the coating to hot glass,
Mark/contaminant 2 (50) max length 3 (75) max length
usually at the time of flat glass manufacturing.
Coating rub none allowed length plus width not to
3.2.18 spot—a small, opaque blemish in the coating.
exceed ⁄4 (19)
3.2.19 stock size—flat glass sheets cut to standard dimen-
Crazing none allowed none allowed
sions that will be cut to smaller sizes in future use.
3.2.20 vacuum deposition—term used to describe a method
Corrosion none allowed none allowed
of manufacture of a coating. The process applies the coating in
A
These specifications apply to cut size glass only. For specifications of stock
a vacuum chamber to flat glass.
size glass contact the manufacturer.
B
The glass shall be inspected, in transmission, at a distance of 10 ft (3.0 m) at
3.2.21 vacuum sputtering—see vacuum deposition.
a viewing angle of 90° to the specimen against a bright uniform background. If a
blemish is readily apparent under these viewing conditions, the above criteria
4. Significance and Use
applies.
C
No more than two readily apparent blemishes are allowed in a 3-in. (75-mm)
4.1 This specification groups coated glass according to
diameter circle, and no more than five readily apparent blemishes are allowed in
a 12-in. (300-mm) diameter circle.
application. These groups are: vision, spandrel/nonvision, and
D
The central area is considered to form a square or rectangle defined by the
overhead. Similar but unique quality tolerances and inspection
center 80 % of the length and 80 % of the width dimensions centered on a lite of
guidelines have been outlined for each application. The glass to
glass. The remaining area is considered the outer area.
be coated shall comply with the applicable provisions of
Specification C 1036 and Specification C 1048.
6.2 Blemishes for Coated Overhead Glass—The type and
4.2 Coating blemishes may be an inherent part of the
number of blemishes shall be no greater than those specified in
glass-coating process. In addition, coatings can be damaged a
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