ASTM C1464-21

Standard Specification for Bent Glass

ABSTRACT
This specification covers the standard for bent glass proposed for use in general building construction, furniture, display, and various other non-automotive applications. When the glass is specified as chemically strengthened, heat-strengthened, or fully tempered, the fabrication processes must be completed prior to the strengthening. The glass specimen shall also undergo impact testing for safety glazing.
SCOPE
1.1 This specification covers the requirements for bent glass used in general building construction, furniture, display, and various other non-automotive applications.  
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.3 The following safety hazards caveat pertains only to the test method portion, Section 8, of this specification.  This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Aug-2021
• ICS: 81.040.20 - Glass in building
• Technical Committee: C14 - Glass and Glass Products
• Drafting Committee: C14.08 - Flat Glass

Relations

• Refers: ASTM C162-23 - Standard Terminology of Glass and Glass Products
• Effective Date: 01-Oct-2023
• Refers: ASTM C1048-18 - Standard Specification for Heat-Strengthened and Fully Tempered Flat Glass
• Effective Date: 01-Oct-2018
• Refers: ASTM C162-05(2015) - Standard Terminology of<brk type="line"/> Glass and Glass Products
• Effective Date: 01-Nov-2015
• Refers: ASTM C1422/C1422M-15 - Standard Specification for Chemically Strengthened Flat Glass
• Effective Date: 01-Nov-2015
• Refers: ASTM C1172-14 - Standard Specification for Laminated Architectural Flat Glass
• Effective Date: 15-Sep-2014
• Refers: ASTM C1048-12e1 - Standard Specification for Heat-Strengthened and Fully Tempered Flat Glass
• Effective Date: 15-Mar-2012
• Refers: ASTM C1048-12 - Standard Specification for Heat-Strengthened and Fully Tempered Flat Glass
• Effective Date: 15-Mar-2012
• Refers: ASTM C1036-11e1 - Standard Specification for Flat Glass
• Effective Date: 01-Oct-2011
• Refers: ASTM C1036-11 - Standard Specification for Flat Glass
• Effective Date: 01-Oct-2011
• Refers: ASTM C1422/C1422M-10 - Standard Specification for Chemically Strengthened Flat Glass
• Effective Date: 01-Oct-2010
• Refers: ASTM C1376-10 - Standard Specification for Pyrolytic and Vacuum Deposition Coatings on Flat Glass
• Effective Date: 01-Mar-2010
• Refers: ASTM C1172-09 - Standard Specification for Laminated Architectural Flat Glass
• Effective Date: 01-May-2009
• Refers: ASTM C1172-09e1 - Standard Specification for Laminated Architectural Flat Glass
• Effective Date: 01-May-2009
• Refers: ASTM C1036-06 - Standard Specification for Flat Glass
• Effective Date: 15-Oct-2006
• Refers: ASTM C162-05(2010) - Standard Terminology of Glass and Glass Products
• Effective Date: 01-Oct-2005

Overview

ASTM C1464-21: Standard Specification for Bent Glass establishes recognized requirements for bent glass products used in general building construction, furniture, display, and a broad range of non-automotive applications. Developed by ASTM International, this standard covers terminology, material classification, fabrication requirements, tolerances, and test methods relevant to the production and quality assurance of bent glass. It ensures that bent glass used for architectural and design purposes meets consistent quality and safety standards.

Key Topics

• Scope: The specification applies to bent glass in architectural, furniture, and display settings, but excludes automotive uses.
• Glass Types: Defines multiple categories, including:
  • Annealed bent glass
  • Chemically strengthened bent glass
  • Fully tempered bent glass
  • Heat-strengthened bent glass
  • Laminated bent glass
  • Miscellaneous combinations
• Fabrication: All finishing processes, such as cutting and drilling, must occur before any chemical or thermal strengthening.
• Tolerances: Dimensional tolerances for height, girth, shape accuracy, cross-bend, and twist are provided to ensure precise manufacturing and fit.
• Visual and Physical Inspection: Includes requirements for maximum allowable blemishes, visual inspection distances, and specific evaluation criteria.
• Safety Glazing: Guidelines for impact testing and marking to comply with federal, ANSI, and building code safety regulations.
• Optical Quality: Discussion of surface distortion and anisotropy inherent to certain strengthening processes.

Applications

ASTM C1464-21 is crucial for architects, glass fabricators, contractors, and manufacturers specifying bent glass in building and interior environments. Its applications include:

• Building Construction: Curved glass walls, atriums, stairs, canopies, and balustrades.
• Furniture: Custom glass tables, cabinetry, or shelving featuring bent glass.
• Displays: Retail showcases, exhibit installations, and artistic architectural features.
• Non-Automotive Safety Glazing: Where impact resistance or compliance with safety glazing standards is required.
• Interior Design: Partitions, railing infill, and unique decorative installations making use of complex glass shapes.

In all cases, users should coordinate with fabricators to confirm feasibility, particularly for unusual or customized bend configurations.

Related Standards

ASTM C1464-21 references a set of related standards to clarify terminology and ensure compatibility with various glass processing and safety requirements:

• ASTM C162: Terminology of Glass and Glass Products
• ASTM C1036: Specification for Flat Glass
• ASTM C1048: Specification for Heat-Strengthened and Fully Tempered Flat Glass
• ASTM C1172: Specification for Laminated Architectural Flat Glass
• ASTM C1376: Specification for Coatings on Flat Glass
• ASTM C1422/C1422M: Specification for Chemically Strengthened Flat Glass
• ANSI Z97.1: Safety Glazing Materials Used in Buildings
• CPSC 16 CFR 1201: U.S. Federal Safety Standard for Architectural Glazing

Consult the current editions for the latest requirements and best practices to ensure compliance across the supply chain.

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Keywords: ASTM C1464-21, bent glass, curved glass, architectural glass, safety glazing, laminated glass, tempered glass, glass tolerances, building glass standards, glass fabrication, non-automotive glass.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1464 −21
Standard Specification for
Bent Glass
This standard is issued under the fixed designation C1464; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 ANSI Standard:
ANSI-Z97.1 Safety Glazing Materials Used in Buildings -
1.1 This specification covers the requirements for bent glass
Safety Performance Specifications and Methods of Test
used in general building construction, furniture, display, and
2.3 Federal Standard:
various other non-automotive applications.
CPSC 16 CFR 1201 Consumer Product Safety Commission
1.2 The values stated in SI units are to be regarded as
Safety Standard for Architectural Glazing Material
standard. The values given in parentheses after SI units are
3. Terminology
provided for information only and are not considered standard.
3.1 Definitions:
1.3 The following safety hazards caveat pertains only to the
3.1.1 Refer to Terminology C162, Specifications C1036,
test method portion, Section 8, of this specification. This
C1422/C1422M, C1376, and C1172, as appropriate.
standard does not purport to address all of the safety concerns,
3.1.2 blemishes in flat glass—refer to Specifications C1036,
if any, associated with its use. It is the responsibility of the user
C1048, C1422/C1422M, C1376, and C1172, as appropriate.
of this standard to establish appropriate safety, health, and
environmental practices and determine the applicability of
3.2 Definitions of Terms Specific to This Standard:
regulatory limitations prior to use.
3.2.1 arc—see girth.
1.4 This international standard was developed in accor-
3.2.2 bend axis—the imaginary pivot point around which a
dance with internationally recognized principles on standard-
radius sweeps, and which may be extended along a line, to
ization established in the Decision on Principles for the
further describe how a surface is being shaped.
Development of International Standards, Guides and Recom-
3.2.3 bend profile—aprofileofthecurvaturetakenatacross
mendations issued by the World Trade Organization Technical
section of the shape perpendicular to the bend axis.
Barriers to Trade (TBT) Committee.
3.2.4 bent glass—flat glass that has been shaped while hot
into a body having curved surfaces.
2. Referenced Documents
3.2.5 chord—a straight line segment that joins two points of
2.1 ASTM Standards:
an arc.
C162 Terminology of Glass and Glass Products
3.2.6 complex bend—a profile shape composed of curvature
C1036 Specification for Flat Glass
not easily defined by multiple radii that can result in a bent
C1048 Specification for Heat-Strengthened and Fully Tem-
shapeononeormoreaxis,typicallydefinedbymodelormold;
pered Flat Glass
see Fig. 1.
C1172 Specification for Laminated Architectural Flat Glass
C1376 Specification for Pyrolytic and Vacuum Deposition
3.2.7 compound bend—a profile shape composed of curva-
Coatings on Flat Glass
ture of more than one radius, curved on two or more axes.
C1422/C1422M Specification for Chemically Strengthened
3.2.8 concave surface—the curved major surface closest to
Flat Glass
an imaginary center point of a circle.
3.2.9 convex surface—the curved major surface farthest
away from an imaginary center point of a circle.
This specification is under the jurisdiction of ASTM Committee C14 on Glass
3.2.10 craze—the splitting or bunching of a coating result-
and Glass Products and is the direct responsibility of Subcommittee C14.08 on Flat
ing from pivot of the major glass surfaces about the centerline
Glass.
Current edition approved Sept. 1, 2021. Published November 2021. Originally
approved in 2000. Last previous edition approved in 2016 as C1464 – 16. DOI:
10.1520/C1464-21. Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 4th Floor, New York, NY 10036, http://www.ansi.org.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Available from U.S. Government Printing Office, Superintendent of
Standards volume information, refer to the standard’s Document Summary page on Documents, 732 N. Capitol St., NW, Washington, DC 20401-0001, http://
the ASTM website. www.access.gpo.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1464 − 21
FIG. 1 Complex Bend
as the glass is bent, and which is a function of the properties of 3.2.24 single bend—a profile composed of a single radius
the coating, thickness of glass, and the tightness of curvature. curved on a single axis, possibly with one or two flat (plane)
areas tangent to the curvature.
3.2.11 crossbend—deviation from a straight edge along a
line perpendicular to the curvature measured on the concave
3.2.25 spherical—a profile shape composed of curvature of
side.
one radius, curved on more than two axes.
3.2.12 cylindrical bend—a profile shape composed of a
3.2.26 twist—one or more of the corners of the glass are not
singlecurvaturewithaconstantradiusandnostraightsections,
in the same plane.
all curved on a single axis.
3.2.13 degree of angle—the angular measurement of a
4. Classification
segment of a curve.
4.1 Kinds—Bent glass furnished under this specification
3.2.14 depth—on a circular bend, the distance from the
shall be of the following kinds, as specified (see Note 1):
midpoint of a chord to the arc measured along its radius
NOTE 1—Not all configurations or combinations are possible. Consult
perpendicular to the circumference.
with the fabricator or manufacturer before specifying.
3.2.15 elliptical bend—a curved profile shape composed of
4.1.1 Kind BA—Bent glass shall be annealed flat glass,
two or more tangential radii on a single axis.
either transparent, patterned, coated, or wired glass in accor-
3.2.16 girth—the distance around the concave or convex
dancewiththeapplicablerequirementsofSpecificationC1036,
surface measured perpendicular to the height including any
C1048,or C1376 as further processed to conform with the
flats.
requirements hereinafter specified for bent glass.
3.2.17 height—the length measurement of the edge perpen-
4.1.2 Kind BCS—Chemically strengthened bent glass shall
dicular to the horizontal arc or girth.
be flat glass, either transparent or patterned, in accordance with
3.2.18 multiple bend—a profile shape composed of a curva-
the applicable requirements of Specification C1036, as further
ture of two or more radii, all curved on a single axis, with at processed to conform with the requirements hereinafter speci-
least two of the curvatures possibly separated by a flat (plane)
fied for bent glass and then in accordance with the applicable
area, and with or without one or more additional flat (plane)
requirements of Specification C1422/C1422M for chemically
areas tangent to the curvatures.
strengthened flat glass.
3.2.19 pock marks—process surface blemishes that consist 4.1.3 Kind BFT—Fully tempered bent glass shall be flat
glass,eithertransparentcoatedorpatterned,inaccordancewith
of small, shallow areas, circular in shape, on the surface of the
glass. theapplicablerequirementsofSpecificationC1036,andC1376
if applicable, as further processed to conform with the require-
3.2.20 ring marks—process surface blemishes that consist
ments hereinafter specified for bent glass and then in accor-
of shallow marks typically running along the perimeter of the
dance with the applicable requirements of Specification C1048
glass surface.
for fully tempered glass.
3.2.21 rotation—a condition where vertical edges (perpen-
4.1.4 Kind BHS—Heat-strengthened bent glass shall be flat
dicular to arc) are not parallel to bending axis.
glass,eithertransparentcoatedorpatterned,inaccordancewith
3.2.22 serpentine bend—profile shape composed of concave
theapplicablerequirementsofSpecificationC1036,andC1376
and convex curvatures of one or more radii on a single axis
if applicable, as further processed to conform with the require-
with or without flat areas tangent to the curvatures.
ments hereinafter specified for bent glass and then in accor-
3.2.23 shape—contoured form including curvature, arc(s), dance with the applicable requirements of Specification C1048
and even flats. for heat-strengthened glass.
C1464 − 21
4.1.5 Kind BL—Laminated bent glass shall be flat glass, 6.1.4 Thickness Requirements:
either transparent coated or patterned, in accordance with the 6.1.4.1 Overall thickness designation.
applicable requirements of Specification C1036, and C1376 if
6.1.4.2 Thickness of individual lites in the laminate.
applicable, as further processed with the requirements herein-
6.1.4.3 Interlayer type and thickness.
after specified for bent glass and then in accordance with the
6.1.5 Interlayer type and color.
applicable requirements of Specification C1172 for laminated
6.1.6 Nominal height, width, radius (see definitions and
glass.
Figs. 1-6).
4.1.6 Kind BX—Bent glass with miscellaneous combina-
6.1.6.1 Black-line or blue-line prints, drawing, template,
tions not previously combined.
configuration, specification, or other forms of information
which detail glass type, overall size, type of bend, and
5. Significance and Use
orientation.
5.1 The user may have quality and/or fabrication require-
6.1.7 Packaging Requirements—Glass packaging and pro-
ments that are different than those of the standard. It is
tection will be standard manufacturer practice unless otherwise
important to discuss these requirements with the fabricator
specified. Consult manufacturer before specifying.
prior to ordering the glass.
6.1.8 Products specifying coated glass should consult with
the coating manufacturer for coating orientation requirements.
5.2 Tolerances for one-of-a-kind, low volume bent glass
versus high production bent glass products may be different.
6.2 Marking:
Glazing conditions will affect these tolerances, such as free
6.2.1 Each bent glass product, as supplied by the
standing and glued in place applications.The cumulative effect
manufacturer, shall bear the manufacturer’s name, or
of tolerances on the glass and system shall be considered.
trademark, or both, unless otherwise specified.
6.2.2 Bent glass intended for safety glazing applications
5.3 Optical quality depends on the glass type. Overall
specified by building codes, shall be permanently marked as
thickness, tightness of radius can influence visual appearance.
required by the applicable safety glazing standard.
Single axis bends compare
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C1464 − 16 C1464 − 21
Standard Specification for
Bent Glass
This standard is issued under the fixed designation C1464; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers the requirements for bent glass used in general building construction, furniture, display, and various
other non-automotive applications.
1.2 The dimensional values, values stated in SI units are to be regarded as the standard. The values given in parentheses after SI
units are provided for information only.only and are not considered standard.
1.3 The following safety hazards caveat pertains only to the test method portion, Section 78, of this specification. This standard
does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C162 Terminology of Glass and Glass Products
C1036 Specification for Flat Glass
C1048 Specification for Heat-Strengthened and Fully Tempered Flat Glass
C1172 Specification for Laminated Architectural Flat Glass
C1376 Specification for Pyrolytic and Vacuum Deposition Coatings on Flat Glass
C1422C1422/C1422M Specification for Chemically Strengthened Flat Glass
2.2 ANSI StandardStandard:
ANSI Z -97.1ANSI-Z97.1 Safety Glazing Materials Used in Buildings—Safety Buildings - Safety Performance Specifications
and Methods of Test
2.3 Federal Document:Standard:
CPSC 16 CFR 1201 Consumer Product Safety Commission Safety Standard for Architectural Glazing Material
3. Terminology
3.1 Definitions:
This specification is under the jurisdiction of ASTM Committee C14 on Glass and Glass Products and is the direct responsibility of Subcommittee C14.08 on Flat Glass.
Current edition approved May 1, 2016Sept. 1, 2021. Published June 2016November 2021. Originally approved in 2000. Last previous edition approved in 20062016 as
C1464 – 06 (2011).C1464 – 16. DOI: 10.1520/C1464-16.10.1520/C1464-21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Available from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402.Superintendent of Documents, 732 N. Capitol St., NW,
Washington, DC 20401-0001, http://www.access.gpo.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1464 − 21
3.1.1 Refer to Terminology C162, Specifications C1036, C1422C1422/C1422M, C1376, and C1172, as appropriate.
3.1.2 Blemishesblemishes in Flat Glass—flat glass—Referrefer to Specifications C1036, C1048, C1422C1422/C1422M, C1376,
and C1172, as appropriate.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 arc—see girth.
3.2.2 bend axis—the imaginary pivot point around which a radius sweeps, and which may be extended along a line, to further
describe how a surface is being shaped.
3.2.3 bend profile—a profile of the curvature taken at a cross section of the shape perpendicular to the bend axis.
3.2.4 bent glass—flat glass that has been shaped while hot into a body having curved surfaces.
3.2.5 chord—a straight line segment that joins two points of an arc.
3.2.6 complex bend—a profile shape composed of curvature not easily defined by multiple radii that can result in a bent shape on
one or more axis, typically defined by model or mold.mold; see Fig. 1.
3.2.7 compound bend—a profile shape composed of curvature of more than one radii,radius, curved on two or more axes.
3.2.8 concave surface—the curved major surface closest to an imaginary center point of a circle.
3.2.9 convex surface—the curved major surface farthest away from an imaginary center point of a circle.
3.2.10 craze—the splitting or bunching of a coating resulting from pivot of the major glass surfaces about the centerline as the
glass is bent, and which is a function of the properties of the coating, thickness of glass, and the tightness of curvature.
3.2.11 crossbend—deviation from a straight edge along a line perpendicular to the curvature measured on the concave side.
3.2.12 cylindrical bend—a profile shape composed of a single curvature with a constant radius and no straight sections, all curved
on a single axis.
3.2.13 degree of angle—the angular measurement of a segment of a curve.
3.2.14 depth—on a circular bend, the distance from the midpoint of a chord to the arc measured along its radius perpendicular to
the circumference.
FIG. 61 Complex Bend
C1464 − 21
3.2.15 elliptical bend—a curved profile shape composed of two or more tangential radii on a single axis.
3.2.16 girth—the distance around the concave or convex surface measured perpendicular to the height including any flats.
3.2.17 height—the length measurement of the edge perpendicular to the horizontal arc or girth.
3.2.18 multiple bend—a profile shape composed of a curvature of two or more radii, all curved on a single axis, with at least two
of the curvatures possibly separated by a flat (plane) area, and with or without one or more additional flat (plane) areas tangent
to the curvatures.
3.2.19 pock marks—process surface blemishsblemishes that consist of small, shallow areas, circular in shape, on the surface of
the glass.
3.2.20 ring marks—process surface blemishsblemishes that consist of shallow marks typically running along the perimeter of the
glass surface.
3.2.21 rotation—a condition where vertical edges (perpendicular to arc) are not parallel to bending axis.
3.2.22 serpentine bend—profile shape composed of concave and convex curvatures of one or more radii on a single axis with or
without flat areas tangent to the curvatures.
3.2.23 shape—contoured form including curvature, arc(s), and even flats.
3.2.24 single bend—a profile composed of a single radius curved on a single axis, possibly with one or two flat (plane) areas
tangent to the curvature.
3.2.25 spherical—a profile shape composed of curvature of one radius, curved on more than two axes.
3.2.26 twist—one or more of the corners of the glass are not in the same plane.
4. Classification
4.1 Kinds—Bent glass furnished under this specification shall be of the following kinds, as specified:specified (see Note 1):
NOTE 1—Not all configurations or combinations are possible. Consult with the fabricator or manufacturer before specifying.
4.1.1 Kind BA—Bent glass shall be annealed flat glass, either transparent, patterned, coated, or wired glass in accordance with the
applicable requirements of Specification C1036, C1048, or C1376 as further processed to conform with the requirements
hereinafter specified for bent glass.
4.1.2 Kind BCS—Chemically strengthened bent glass shall be flat glass, either transparent or patterned, in accordance with the
applicable requirements of Specification C1036, as further processed to conform with the requirements hereinafter specified for
bent glass and then in accordance with the applicable requirements of Specification C1422C1422/C1422M for chemically
strengthened flat glass.
4.1.3 Kind BFT—Fully tempered bent glass shall be flat glass, either transparent coated or patterned, in accordance with the
applicable requirements of Specification C1036, and C1376 if applicable, as further processed to conform with the requirements
hereinafter specified for bent glass and then in accordance with the applicable requirements of Specification C1048 for fully
tempered glass.
4.1.4 Kind BHS—Heat-strengthened bent glass shall be flat glass, either transparent coated or patterned, in accordance with the
applicable requirements of Specification C1036, and C1376 if applicable, as further processed to conform with the requirements
hereinafter specified for bent glass and then in accordance with the applicable requirements of Specification C1048 for
heat-strengthened glass.
C1464 − 21
4.1.5 Kind BL—Laminated bent glass shall be flat glass, either transparent coated or patterned, in accordance with the applicable
requirements of Specification C1036, and C1376 if applicable, as further processed with the requirements hereinafter specified for
bent glass and then in accordance with the applicable requirements of Specification C1172 for laminated glass.
4.1.6 Kind BX—Bent glass with miscellaneous combinations not previously combined.
NOTE 1—Not all configurations or combinations are possible. Consult with the fabricator or manufacturer before specifying.
5. Significance and Use
5.1 The user may have quality and/or fabrication requirements that are different than those of the standard. It is important to
discuss these requirements with the fabricator prior to ordering the glass.
5.2 Tolerances for one-of-a-kind, low volume bent glass versus high production bent glass products may be different. Glazing
conditions will affect these tolerances, such as free standing and glued in place applications. The cumulative effect of tolerances
on the glass and system shall be considered.
5.3 Optical quality depends on the glass type. Overall thickness, tightness of radius can influence visual appearance. Single axis
bends compared to compound or complex shapes with or without tangential flats will introduce the risk of distortion, which
becomes compounded when laminated or combined into insulating glass units.
6. Ordering Information
NOTE 2—The user shall discuss quality requirements that fall outside of this standard with the fabricator prior to ordering.
6.1 Purchasers should include the following information in procurement documents:
6.1.1 Title, number, and date of this specification.
6.1.2 Kind of bent glass as referred to in this specification (see Section 4).
6.1.3 Fabrication requirements (see Section 67).
6.1.4 Thickness Requirements:
6.1.4.1 Overall thickness designation.
6.1.4.2 Thickness of individual lites in the laminate.
6.1.4.3 Interlayer type and thickness.
6.1.5 Interlayer type and colorcolor.
6.1.6 Nominal height, width, radius (see definitions and Figs. 1-66).
6.1.6.1 Black-line or blue-line prints, drawing, template, configuration, specification, or other forms of information which detail
glass type, overall size, type of bend, and orientationorientation.
5.1.7 Safety standards or regulations to which the glass must conform, be labeled, or both.
6.1.7 Packaging Requirements—Glass packaging and protection will be standard manufacturer practice unless otherwise specified.
Consult manufacturer before specifying.
6.1.8 Products specifying coated glass should consult with the coating manufacturer for coating orientation requirements.
6.2 Marking:
C1464 − 21
FIG. 12 Cylindrical Bend
A = outside radius,
B = chord,
C = height,
D = girth, and
E = depth.
6.2.1 Each bent glass product, as supplied by the manufacturer, shall bear the manufacturer’s name, or trademark, or both, unless
otherwise specifie
...