ASTM C1503-08(2013)
(Specification)Standard Specification for Silvered Flat Glass Mirror
Standard Specification for Silvered Flat Glass Mirror
ABSTRACT
This specification covers the requirements for silvered flat glass mirrors of rectangular shape supplied as cut sizes, stock sheets or as lehr ends and to which no further processing (such as edgework or other fabrication) has been done. The quality requirements of silvered annealed monolithic clear and tinted flat glass mirrors up to a certain thickness are also discussed. The mirrors are intended to be used indoors for mirror glazing, for components of decorative accessories or for similar uses. The mirrors are not intended for use in environments where high humidity or airborne corrosion promoters, or both, are consistently present (such as swimming pool areas, ocean-going vessels, chemical laboratories and other corrosive environments). The classification of mirrors are according to the following properties: grades, cut size, stock sheet, lehr end, select quality, glazing quality, color (clear or tinted), and thickness. Different test methods shall be performed in order to determine or measure the following properties: reflectance, silver coating appearance, coating resistance, blemish (point and linear blemishes), dimension, and squareness.
SCOPE
1.1 This specification covers the requirements for silvered flat glass mirrors of rectangular shape supplied as cut sizes, stock sheets or as lehr ends and to which no further processing (such as edgework or other fabrication) has been done.
1.2 This specification covers the quality requirements of silvered annealed monolithic clear and tinted flat glass mirrors up to 6 mm (1/4 in.) thick. The mirrors are intended to be used indoors for mirror glazing, for components of decorative accessories or for similar uses.
1.3 This specification does not address safety glazing materials nor requirements for mirror applications. Consult model building codes and other applicable standards for safety glazing applications.
1.4 Mirrors covered in this specification are not intended for use in environments where high humidity or airborne corrosion promoters, or both, are consistently present (such as swimming pool areas, ocean-going vessels, chemical laboratories and other corrosive environments).
1.5 The dimensional values stated in metric units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.
1.6 The following safety hazards caveat pertains only to the test method portion Section 7 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 and health practices and determine the applicability of regulatory requirements prior to use.
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Designation:C1503 −08 (Reapproved 2013)
Standard Specification for
Silvered Flat Glass Mirror
This standard is issued under the fixed designation C1503; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 ASTM Standards:
B117Practice for Operating Salt Spray (Fog) Apparatus
1.1 This specification covers the requirements for silvered
C162Terminology of Glass and Glass Products
flat glass mirrors of rectangular shape supplied as cut sizes,
C1036Specification for Flat Glass
stock sheets or as lehr ends and to which no further processing
E903Test Method for Solar Absorptance, Reflectance, and
(such as edgework or other fabrication) has been done.
Transmittance of Materials Using Integrating Spheres
1.2 This specification covers the quality requirements of
3. Terminology
silvered annealed monolithic clear and tinted flat glass mirrors
up to 6 mm ( ⁄4 in.) thick. The mirrors are intended to be used
3.1 Definitions:
indoors for mirror glazing, for components of decorative
3.1.1 Refer to Terminology C162 and the standards refer-
accessories or for similar uses.
enced in 2.2 as appropriate.
3.1.2 associated distortion, n—alteration of viewed images
1.3 This specification does not address safety glazing ma-
causebyvariationsinglassflatnessininhomogeneousportions
terialsnorrequirementsformirrorapplications.Consultmodel
within the glass.
building codes and other applicable standards for safety
glazing applications. 3.1.3 blemishes—imperfections in the body, on the surface
or in the silver coating of the mirror; for the purpose of this
1.4 Mirrorscoveredinthisspecificationarenotintendedfor
specification blemishes are divided into 3 categories:
useinenvironmentswherehighhumidityorairbornecorrosion
3.1.3.1 linear blemishes—scratches, rubs, digs, and other
promoters,orboth,areconsistentlypresent(suchasswimming
similar imperfections on either surface of the glass substrate.
pool areas, ocean-going vessels, chemical laboratories and
other corrosive environments).
3.1.3.2 point blemishes—crush, knots, dirt, stones, gaseous
inclusions (seeds and bubbles), tin particles, and other similar
1.5 The dimensional values stated in metric units are to be
imperfections in the body of the glass substrate.
regarded as the standard. The inch-pound units given in
3.1.3.3 silver film blemishes—visible clouding, spot silver
parentheses are for information only.
faults and other similar imperfections of the silver coating.
1.6 The following safety hazards caveat pertains only to the
3.1.4 chip—an imperfection on the edge of a mirror lite due
test method portion Section 7 of this specification. This
to breakage of a small fragment out of an otherwise regular
standard does not purport to address all of the safety concerns,
surface.
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health
3.1.4.1 shell chip—a circular indentation in the mirror edge
practices and determine the applicability of regulatory require-
due to breakage of a small fragment.
ments prior to use.
3.1.4.2 v-chip—a V-shaped chip indentation in the mirror
edge due to breakage of a small fragment.
2. Referenced Documents
3.1.4.3 chip width—the perpendicular distance from the
2.1 Reference to these documents shall be the latest issue
edge of the mirror to the inner edge of the chip.
unless otherwise specified by the authority applying this
3.1.4.4 chip length—the distance, parallel to the edge of the
specification:
mirror, from one edge of a chip to the other.
3.1.4.5 chip depth—the measured distance of a chip from
the face of the mirror into the thickness.
This specification is under the jurisdiction ofASTM Committee C14 on Glass
and Glass Products and is the direct responsibility of Subcommittee C14.08 on Flat
Glass. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2013. Published April 2013. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2001. Last previous edition approved in 2008 as C1503–08. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C1503-08R13. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1503−08 (2013)
3.1.5 clean cut edge—natural cut edge of mirror without 4.1.3 Mirror Lehr End—Mirrors intended for recutting by
further fabrication. the user into smaller sizes where it is expected that some
material may be lost in cutting due to blemishes and edge
3.1.6 cluster—a group of not less than 3 point blemishes
quality.
separated by not more than 50 mm (2 in.).
4.2 Qualities—Mirrors furnished under this specification
3.1.7 crush—a lightly pitted area in the glass surface result-
shall be of the following qualities, as specified.
ing in a dull gray or white appearance over the region.
4.2.1 Mirror Select Quality—(Usuallyavailablein6mm( ⁄4
3.1.8 dig—deep, short scratch in the glass surface.
in.) clear mirror only.) Recommended or intended or both, for
use in visually demanding applications requiring minimal
3.1.9 dirt—a small particle of foreign material imbedded in
distortion and blemishes.
the glass surface.
4.2.2 Mirror Glazing Quality—Recommended or intended
3.1.10 edge corrosion—change in the color or level of
or both, for general use where limited levels of minor blem-
reflectance along the mirror edge as a result of degradation of
ishes or distortion, or both are acceptable.
the silver coating from external sources.
4.3 Color—The glass substrate may be clear or tinted.
3.1.11 edgework—fabricationofthemirroredgebeyondthe
4.3.1 Clear Glass Mirrors—Mirrors made with clear (un-
original clean-cut condition.
tinted) glass. (This does NOT include low-iron glass mirrors.)
3.1.12 flare—a protrusion on the edge of a lite of mirror.
4.3.2 Low-Iron Glass Mirrors—Mirrorsmadewithlow-iron
content glass. Intended for use in applications where increased
3.1.13 gaseous inclusion—(also known as seed or bubble)a
lightreflectanceandglassclarityarerequired.Notallgradesor
round or elongated bubble at the surface (open) or within the
qualities may be available in low-iron glass mirrors.
body thickness leaving a cavity in the mirror.
4.3.3 Tinted Glass Mirrors—Mirrors made with tinted (col-
3.1.14 knot—an inhomogeneity in the form of a vitreous
ored) glass. Intended for use primarily in decorative applica-
lump in the mirror.
tions where diminished light reflectance is not a concern. A
variety of tinted glass substrates are available.The specific tint
3.1.15 mirror cut size—mirrors intended for final use in the
size ordered (i.e. mirrors not intended for recutting). desired should be specified by the purchaser and is subject to
availability. Not all grades or qualities may be available in
3.1.16 mirror lehr end—mirrors intended for recutting by
tinted glass mirror.
the user into smaller sizes where it is expected that some
material may be lost in cutting due to blemishes and edge NOTE1—Althoughusuallyimperceptible,actualcolororshadeofclear
glass, tinted glass or low-iron glass substrates may vary from manufac-
quality.
turer to manufacturer and from batch to batch.
3.1.17 mirror stock sheet—mirrors intended for architec-
4.4 Thickness—Mirrors are available in the standard nomi-
tural use and where trimming will be required.
nal thicknesses provided in Table 1:
3.1.18 rub—an abrasion of the mirror surface producing a
5. Ordering Information
frosted appearance.
5.1 Purchasers should select the preferred options permitted
3.1.19 scratch—damage on the glass surface in the form of
in this specification and include the following information in
a line caused by the movement of an object across and in
procurement documents:
contact with the glass surface.
5.1.1 Title, number, and date of this specification.
3.1.20 silver coating—the metallic silver coating in a sil-
5.1.2 Grade of mirror (see 4.1).
vered mirror product.
3.1.21 silvered mirror—mirror product fabricated through
TABLE 1 Available Nominal Mirror Thickness
the application of metallic silver and protected by a mirror
Nominal Designation Intended use
backing paint.
SI Traditional Maximum Recommended
Desig- designation recommended application
3.1.22 spot silver fault—a small area at which the silver
nation surface area
coating is partially or entirely absent.
(mm) per
cut size piece
3.1.23 stone—a crystalline inclusion in the mirror.
2.5 single Up to .5 sq. m. Utility mirrors where distortion
3.1.24 visible clouding—a frosted appearance in the re-
(5 ft ) and blemishes are not a
major concern
flected image from a silvered mirror.
3.0 double Up to .75 sq. m. Mirror components and other
or (7.5 ft ) general use applications
4. Classification and Intended Use ⁄8 in.
4.0 ⁄32 in. Up to 1 sq. m. Mirror components and other
4.1 Grades—Mirrorsfurnishedunderthisspecificationshall (10 ft ) general use applications
5.0 ⁄16 in. Up to 3 sq. m. Architectural use and other
be of the following grades, as specified.
(32 ft ) applications where optical
4.1.1 Mirror Cut Size—Mirrors intended for final use in the
quality is a major concern
6.0 ⁄4 in. Up to 3 sq. m. Architectural use and other
size ordered (that is, mirrors not intended for recutting).
(32 ft .) applications where optical
4.1.2 MirrorStock Sheet—Mirrorsintendedforarchitectural
quality is a major concern
use and where trimming will be required.
C1503−08 (2013)
5.1.3 Quality of mirror (see 4.2). 6.4 Edge Quality Requirements—Edges shall be clean cut.
5.1.4 Color of mirror (see 4.3). (Types and qualities of edgework are not within the scope of
5.1.5 Thickness of mirror. this specification. Consult manufacturer before specifying.)
5.1.6 Nominal length and width. 6.4.1 Shell Chips—Shell chips are permitted in the edges of
clean cut mirror as long as they do not exceed the acceptance
5.2 Packaging Requirements—Mirror packaging and pro-
criteria shown in Table 6.
tection shall be standard manufacturer practice unless other-
6.4.2 V-Chips—Visible V-Chips are not permitted. (See 7.1
wise specified. Consult manufacturer before specifying.
for viewing criteria.)
6. Requirements 6.5 Dimensional Tolerances:
6.5.1 Thickness—When measured at any point throughout
6.1 Reflectance Requirements—When measured in accor-
the sheet, tolerances for thickness (including uniformity of
dance with Test Method 7.2, reflectance shall not be less than
thickness) of mirrors shall be in accordance with Table 2.
the following:
6.5.2 Length and Width—When measured in accordance
6.1.1 For clear and low-iron glass mirrors—minimum vis-
with Test Method 7.4, tolerances for length and width of
ible light reflected=83%.
mirrors shall be in accordance with Table 2.
6.1.2 For tinted glass mirrors—minimum visible light re-
2 6.5.3 Squareness—When measured in accordance with Test
flected=(T) (where T=the visible light transmission value
Method 7.5, tolerances for squareness of mirrors shall be in
for the glass substrate in its unsilvered state.)
accordance with Table 2.
6.2 Coating Requirements:
6.6 Distortion Requirements—Limited levels of distortion
6.2.1 Appearance of Silver Coating—When inspected in
are inherent in flat glass mirrors and are permitted, provided
accordance with Test Method 7.1.3, the silver coating shall be
that the glass used in manufacturing the mirrors conforms to
free of visible silver coating blemishes.
the following limits.
6.2.2 Coating Resistance Requirements—When tested in
6.6.1 Distortion Limits for Mirror Select Quality Mirrors—
accordance with Test Method 7.3 mirrors shall meet the
GlassusedinthemanufactureofMirrorSelectQualitymirrors
requirements shown in Table 7.
shall conform to the allowable distortion limits cited in
6.3 Blemish Limits—Blemishes, other than visible blem-
Specification C1036 for Q1 quality glass.
ishes in the silver coating, are permitted within the following
6.6.2 Distortion Limits for Mirror Glazing Quality
limits.
Mirrors—Glass used in the manufacture of Mirror Glazing
6.3.1 Blemish Limits for Mirror Cut Size and Mirror Stock
Qualitymirrorsshallconformtotheallowabledistortionlimits
Sheet Grades:
cited in Specification C1036 for Q2 quality glass.
6.3.1.1 Linear Blemish Limits—When inspected in accor-
6.7 Fabrication Requirements—Mirrors may be further fab-
dance with Test Method 7.1.2 linear blemishes shall be within
ricated using a variety of cutting, edging, and decorating
the limits shown in Table 5.
processes.These processes are not covered within the scope of
6.3.1.2 Point Blemish Limits—When inspected in accor-
this specification and must be agreed upon between buyer and
dancewithTestMethod7.1.1.1pointblemishesshallbewithin
seller.
the limits shown in Table 3.
6.3.2 Blemish Limits for Mirror Lehr End Grade:
7. Test Methods
6.3.2.1 Linear Blemish Limits—When tested in accordance
with Test Method 7.1.2 mirrors shall meet the quality require- 7.1 Visual Inspection—All visual inspections shall be made
ments shown in Table 5. with 20/20 vision (naked eye or corrected). Place samples in
6.3.2.2 Point Blemish Limits—When tested in accordance the vertical position at the distance specified in the sections
with Test Method 7.1.1.1 mirrors shall meet the quality following.Unlessotherwisespecifiedinthesectionsbelow,the
requirements shown in Tables 3 and 4. viewer shall inspect the reflective surface of the sample at an
TABLE 2 Dimensional Tolerances for Mirror Cut Size, Mirror Stock Sheet and Mirror Lehr End Grades
A B
Nominal Designation Thickness Range Squareness Length and Width Tolerance
SI Traditional mm in. Cut Size Stock Sheet and Cut Stock Sheet
Designation Designation Lehr End Size and
mm Lehr End
min max min max Max. D1-D2 ±mm ±mm
mm (in.) (± in.) (± in.)
5 1 1 1
2.5 mm (Single) 2.16 to 2.57 0.085 to 0.101 2.0 ( ⁄64) 3.0 ( ⁄8) 1.6 ( ⁄16) 6.4 ( ⁄4)
1 5 1 1 1
3.0 mm (Double- ⁄8 in.) 2.92 to 3.40 0.115 to 0.134 2.0 ( ⁄64) 3.0 ( ⁄8) 1.6 ( ⁄16) 6.4 ( ⁄4)
5 5 1 1 1
4.0 mm ( ⁄32 in.) 3.78 to 4.19 0.149 to 0.165 2.0 ( ⁄64) 3.0 ( ⁄8) 1.6 ( ⁄16) 6.4 ( ⁄4)
3 5 1 1 1
5.0 mm ( ⁄16 in.) 4.57 to 5.07 0.180 to 0.199 2.0( ⁄64) 3.0( ⁄8) 1.6 ( ⁄16) 6.4 ( ⁄4)
1 5 1 1 1
6.0 mm ( ⁄4 in.) 5.56 to 6.20 0.219 to 0.244 2.0 ( ⁄64) 3.0 ( ⁄8) 1.6 ( ⁄16) 6.4 ( ⁄4)
A
The mirror shall not vary in thickness more than 0.1 mm (.004 in.) over a 100 mm (4 in.) area.
B
Length and width of mirrors include flares and bevels.
C1503−08 (2013
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