ASTM C1503-2018 Standard Specification for Silvered Flat Glass Mirror.pdf

1、Designation: C1503 18Standard Specification forSilvered Flat Glass Mirror1This standard is issued under the fixed designation C1503; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses

2、 indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the requirements for silveredflat glass mirrors of rectangular shape supplied as cut sizes,stock sheets, or as lehr ends and to wh

3、ich no further processing(such as edgework or other fabrication) has been done.1.2 This specification covers the quality requirements ofsilvered annealed monolithic clear and tinted flat glass mirrorsonly, up to 6 mm (14 in.) thick. The mirrors are intended to beused indoors for mirror glazing, for

4、components of decorativeaccessories or for similar uses.1.3 This specification does not address safety glazing ma-terials nor requirements for mirror applications. Consult modelbuilding codes and other applicable standards for safetyglazing applications.1.4 Mirrors covered in this specification are

5、not intended foruse in environments where high humidity or airborne corrosionpromoters, or both, are consistently present (such as swimmingpool areas, ocean-going vessels, chemical laboratories, andother corrosive environments).1.5 The dimensional values stated in metric units are to beregarded as t

6、he standard. The inch-pound units given inparentheses are for information only.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental pr

7、actices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides

8、and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 Reference to these documents shall be the latest issueunless otherwise specified by the authority applying thisspecification:2.2 ASTM Standards:2B117 Practice for Operati

9、ng Salt Spray (Fog) ApparatusC162 Terminology of Glass and Glass ProductsC1036 Specification for Flat GlassE903 Test Method for Solar Absorptance, Reflectance, andTransmittance of Materials Using Integrating Spheres3. Terminology3.1 Definitions:3.1.1 Refer to Terminology C162 and the standards refer

10、-enced in 2.2 as appropriate.3.1.2 associated distortion, nalteration of viewed imagescause by variations in glass flatness in inhomogeneous portionswithin the glass.3.1.3 blemishes, nimperfections in the body, on the sur-face or in the silver coating of the mirror; for the purpose ofthis specificat

11、ion blemishes are divided into three categories:3.1.3.1 linear blemishes, nscratches, rubs, digs, and othersimilar imperfections on either surface of the glass substrate.3.1.3.2 point blemishes, ncrush, knots, dirt, stones, gas-eous inclusions (seeds and bubbles), tin particles, and othersimilar imp

12、erfections in the body of the glass substrate.3.1.3.3 silver film blemishes, nvisible clouding, spot silverfaults, and other similar imperfections of the silver coating.3.1.4 chip, nan imperfection on the edge of a mirror litedue to breakage of a small fragment out of an otherwise regularsurface.3.1

13、.4.1 shell chip, na circular indentation in the mirroredge due to breakage of a small fragment.3.1.4.2 v-chip, na V-shaped chip indentation in the mirroredge due to breakage of a small fragment.3.1.4.3 chip width, nthe perpendicular distance from theedge of the mirror to the inner edge of the chip.1

14、This specification is under the jurisdiction of ASTM Committee C14 on Glassand Glass Products and is the direct responsibility of Subcommittee C14.08 on FlatGlass.Current edition approved Aug. 1, 2018. Published August 2018. Originallyapproved in 2001. Last previous edition approved in 2013 as C1503

15、 08 (2013).DOI: 10.1520/C1503-18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International

16、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides a

17、nd Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.1.4.4 chip length, nthe distance, parallel to the edge ofthe mirror, from one edge of a chip to the other.3.1.4.5 chip depth, nthe measured distance of a chip fromthe face of the mirror into the

18、thickness.3.1.5 clean cut edge, ncut edge of mirror without furtherfabrication.3.1.6 cluster, na group of not less than three point blem-ishes separated by not more than 50 mm (2 in.).3.1.7 crush, na lightly pitted area in the glass surfaceresulting in a dull gray or white appearance over the region

19、.3.1.8 dig, ndeep, short scratch in the glass surface.3.1.9 dirt, na small particle of foreign material imbeddedin the glass surface.3.1.10 edge corrosion, nchange in the color or level ofreflectance along the mirror edge as a result of degradation ofthe silver coating from external sources.3.1.11 e

20、dgework, nfabrication of the mirror edge beyondthe original clean-cut condition.3.1.12 flare, na protrusion on the edge of a lite of mirror.3.1.13 gaseous inclusion, n(also known as seed or bubble)a round or elongated bubble at the surface (open) or within thebody thickness leaving a cavity in the m

21、irror.3.1.14 knot, nan inhomogeneity in the form of a vitreouslump in the mirror.3.1.15 mirror cut size, nmirrors intended for final use inthe size ordered (that is, mirrors not intended for recutting).3.1.16 mirror lehr end, nmirrors intended for recutting bythe user into smaller sizes where it is

22、expected that somematerial may be lost in cutting due to blemishes and edgequality.3.1.17 mirror stock sheet, nmirrors intended for architec-tural use and where trimming will be required.3.1.18 rub, nan abrasion of the mirror surface producing afrosted appearance.3.1.19 scratch, ndamage on the glass

23、 surface in the formof a line caused by the movement of an object across and incontact with the glass surface.3.1.20 silver coating, nthe metallic silver coating in asilvered mirror product.3.1.21 silvered mirror, nmirror product fabricated throughthe application of metallic silver and protected by

24、a mirrorbacking paint.3.1.22 spot silver fault, na small area at which the silvercoating is partially or entirely absent.3.1.23 stone, na crystalline inclusion in the mirror.3.1.24 visible clouding, na frosted appearance in thereflected image from a silvered mirror.4. Classification and Intended Use

25、4.1 GradesMirrors furnished under this specification shallbe of the following grades, as specified.4.1.1 Mirror Cut SizeMirrors intended for final use in thesize ordered (that is, mirrors not intended for recutting).4.1.2 Mirror Stock SheetMirrors intended for architecturaluse and where trimming wil

26、l be required.4.1.3 Mirror Lehr EndMirrors intended for recutting bythe user into smaller sizes where it is expected that somematerial may be lost in cutting due to blemishes and edgequality.4.2 QualitiesMirrors furnished under this specificationshall be of the following qualities, as specified.4.2.

27、1 Mirror Select Quality(Usually available in 6 mm(14 in.) clear mirror only.) Recommended or intended or both,for use in visually demanding applications requiring minimaldistortion and blemishes.4.2.2 Mirror Glazing QualityRecommended or intendedor both, for general use where limited levels of minor

28、 blem-ishes or distortion, or both are acceptable.4.3 ColorThe glass substrate may be clear or tinted.4.3.1 Clear Glass MirrorsMirrors made with clear (un-tinted) glass. (This does NOT include low-iron glass mirrors.)4.3.2 Low-Iron Glass MirrorsMirrors made with low-ironcontent glass. Intended for u

29、se in applications where increasedlight reflectance and glass clarity are required. Not all grades orqualities may be available in low-iron glass mirrors.4.3.3 Tinted Glass MirrorsMirrors made with tinted (col-ored) glass. Intended for use primarily in decorative applica-tions where diminished light

30、 reflectance is not a concern. Avariety of tinted glass substrates are available. The specific tintdesired should be specified by the purchaser and is subject toavailability. Not all grades or qualities may be available intinted glass mirror.NOTE 1Although usually imperceptible, actual color or shad

31、e of clearglass, tinted glass, or low-iron glass substrates may vary from manufac-turer to manufacturer and from batch to batch.4.4 ThicknessMirrors are available in the standard nomi-nal thicknesses provided in Table 1:5. Ordering Information5.1 Purchasers should select the preferred options permit

32、tedin this specification and include the following information inprocurement documents:TABLE 1 Available Nominal Mirror ThicknessNominal Designation Intended useSIDesig-nation(mm)TraditionaldesignationMaximumrecommendedsurface areapercut size pieceRecommendedapplication2.5 single Up to .5 sq. m.(5 f

33、t2)Utility mirrors where distortionand blemishes are not amajor concern3.0 doubleor18 in.Up to .75 sq. m.(7.5 ft2)Mirror components and othergeneral use applications4.0532 in. Up to 1 sq. m.(10 ft2)Mirror components and othergeneral use applications5.0316 in. Up to 3 sq. m.(32 ft2)Architectural use

34、and otherapplications where opticalquality is a major concern6.014 in. Up to 3 sq. m.(32 ft2.)Architectural use and otherapplications where opticalquality is a major concernC1503 1825.1.1 Title, number, and date of this specification.5.1.2 Grade of mirror (see 4.1).5.1.3 Quality of mirror (see 4.2).

35、5.1.4 Color of mirror (see 4.3).5.1.5 Thickness of mirror.5.1.6 Nominal length and width.5.2 Packaging RequirementsMirror packaging and pro-tection shall be standard manufacturer practice unless other-wise specified. Consult manufacturer before specifying.6. Requirements6.1 Reflectance RequirementsW

36、hen measured in accor-dance with Test Method 7.2, reflectance shall not be less thanthe following:6.1.1 For clear and low-iron glass mirrorsminimum vis-ible light reflected = 83 %.6.1.2 For tinted glass mirrorsminimum visible light re-flected = (T)2(where T = the visible light transmission valuefor

37、the glass substrate in its unsilvered state).6.2 Coating Requirements:6.2.1 Appearance of Silver CoatingWhen inspected inaccordance with Test Method 7.1.3, the silver coating shall befree of visible silver coating blemishes.6.2.2 Coating Resistance RequirementsWhen tested inaccordance with Test Meth

38、od 7.3 mirrors shall meet therequirements shown in Table 7.6.3 Blemish LimitsBlemishes, other than visible blem-ishes in the silver coating, are permitted within the followinglimits.6.3.1 Blemish Limits for Mirror Cut Size and Mirror StockSheet Grades:6.3.1.1 Linear Blemish LimitsWhen inspected in a

39、ccor-dance with Test Method 7.1.2 linear blemishes shall be withinthe limits shown in Table 5.6.3.1.2 Point Blemish LimitsWhen inspected in accor-dance with Test Method 7.1.1 point blemishes shall be withinthe limits shown in Table 3.6.3.2 Blemish Limits for Mirror Lehr End Grade:6.3.2.1 Linear Blem

40、ish LimitsWhen tested in accordancewith Test Method 7.1.2 mirrors shall meet the quality require-ments shown in Table 5.6.3.2.2 Point Blemish LimitsWhen tested in accordancewith Test Method 7.1.1 mirrors shall meet the quality require-ments shown in Tables 3 and 4.6.4 Edge Quality RequirementsEdges

41、shall be clean cut.(Types and qualities of edgework are not within the scope ofthis specification. Consult manufacturer before specifying.)6.4.1 Shell ChipsShell chips are permitted in the edges ofclean cut mirror as long as they do not exceed the acceptancecriteria shown in Table 6.6.4.2 V-ChipsVis

42、ible V-Chips are not permitted. (See 7.1for viewing criteria.)6.5 Dimensional Tolerances:6.5.1 ThicknessWhen measured at any point throughoutthe sheet, tolerances for thickness (including uniformity ofthickness) of mirrors shall be in accordance with Table 2.6.5.2 Length and WidthWhen measured in ac

43、cordancewith Test Method 7.4, tolerances for length and width ofmirrors shall be in accordance with Table 2.6.5.3 SquarenessWhen measured in accordance with TestMethod 7.5, tolerances for squareness of mirrors shall be inaccordance with Table 2.6.6 Distortion RequirementsLimited levels of distortion

44、are inherent in flat glass mirrors and are permitted, providedthat the glass used in manufacturing the mirrors conforms tothe following limits.6.6.1 Distortion Limits for Mirror Select Quality MirrorsGlass used in the manufacture of Mirror Select Quality mirrorsshall conform to the allowable distort

45、ion limits and inspectionprocedure cited in Specification C1036 for Q1 quality glass.6.6.2 Distortion Limits for Mirror Glazing QualityMirrorsGlass used in the manufacture of Mirror GlazingQuality mirrors shall conform to the allowable distortion limitsand inspection procedure cited in Specification

46、 C1036 for Q2quality glass.6.7 Fabrication RequirementsMirrors may be further fab-ricated using a variety of cutting, edging, and decoratingprocesses. These processes are not covered within the scope ofthis specification and must be agreed upon between buyer andseller.7. Test Methods7.1 Visual Inspe

47、ctionVisual inspections for blemishesshall be made with 20/20 vision (naked eye or corrected). Placesamples in the vertical position at the distance specified in thesections following. Unless otherwise specified in the sectionsbelow, the viewer shall inspect the reflective surface of thesample at an

48、 angle of 90, plus or minus 10, perpendicular toTABLE 2 Dimensional Tolerances for Mirror Cut Size, Mirror Stock Sheet and Mirror Lehr End GradesNominal Designation Thickness RangeASquareness Length and WidthBToleranceSIDesignationmmTraditionalDesignationmm in. Cut Size Stock Sheet andLehr EndCutSiz

49、eStock SheetandLehr Endmin max min max Max. D1-D2mm (in.)mm( in.)mm( in.)2.5 mm (Single) 2.16 to 2.57 0.085 to 0.101 2.0 (564) 3.0 (18) 1.6 (116) 6.4 (14)3.0 mm (Double-18 in.) 2.92 to 3.40 0.115 to 0.134 2.0 (564) 3.0 (18) 1.6 (116) 6.4 (14)4.0 mm (532 in.) 3.78 to 4.19 0.149 to 0.165 2.0 (564) 3.0 (18) 1.6 (116) 6.4 (14)5.0 mm (316 in.) 4.57 to 5.07 0.180 to 0.199 2.0(564) 3.0(18) 1.6 (116) 6.4 (14)6.0 mm (14 in.) 5.56 to 6.20 0.219 to 0.244 2.0 (564) 3.0 (18) 1.6 (116) 6.4 (14)AT