ASTM E252-2006(2013) 7500 Standard Test Method for Thickness of Foil Thin Sheet and Film by Mass Measurement《采用质量测量的箔片 薄板和薄膜厚度的标准试验方法》.pdf
《ASTM E252-2006(2013) 7500 Standard Test Method for Thickness of Foil Thin Sheet and Film by Mass Measurement《采用质量测量的箔片 薄板和薄膜厚度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E252-2006(2013) 7500 Standard Test Method for Thickness of Foil Thin Sheet and Film by Mass Measurement《采用质量测量的箔片 薄板和薄膜厚度的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E252 06 (Reapproved 2013)Standard Test Method forThickness of Foil, Thin Sheet, and Film by MassMeasurement1This standard is issued under the fixed designation E252; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This test method covers the
3、determination of the thick-ness of metallic foil and sheet 0.015 in. (0.38 mm) and less inthickness by measuring the mass of a specimen of known areaand density. The test method is applicable to other sheet, foil,and film as indicated in Annex A3.1.2 The values stated in inch-pound units are to be r
4、egardedas the standard. The values given in parentheses are mathemati-cal conversions to SI units, which are provided for informationonly and are not considered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility
5、of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 The following documents of the issue in effect on thedate of material purchase, unless otherwise noted, form a partof
6、this specification to the extent referenced herein:2.2 ASTM Standards:2D1505 Test Method for Density of Plastics by the Density-Gradient TechniqueE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3. Apparatus3.1 Precision Blanking Pressto cut foil or s
7、heet circlesthat are 8.000 6 0.008 in.2(51.613 6 0.051 cm2) in area or3.1915 6 0.0015 in. (81.06 6 0.04 mm) in diameter. Other sizespecimens may be used with the recognition that the accuracystated in 6.1 is no longer applicable. See Annex A1 for theselection of other specimen sizes and the resultin
8、g change inaccuracy of the test method.3.2 Balancecapable of measuring to the nearest 0.1 mg ofthickness for the 8.000-in.2(51.613-cm2) circle.4. Procedure4.1 Blank an 8.000 6 0.008-in.2(51.613 6 0.051-cm2)circle representative of the foil or sheet, swab with acetone orother suitable solvent to ensu
9、re a surface free of soil, anddetermine the mass of the clean, dry specimen to the nearest0.1 mg. Use a suitable solvent to remove any coating known toexceed 0.005 mg/ft2(4.645 mg/cm2) of surface area.5. Calculation5.1 Determine the thickness from the relationship:T 5MADwhere:T = thickness of the fo
10、il, sheet, or film, in. (or cm),M = mass of the circle, g,A = area of the circle, in.2(or cm2), andD = density of the foil, sheet, or film, g/in.3(or Mg/m3).5.2 Densities of Aluminum Alloys:5.2.1 Calculate the density of aluminum foil or sheet fromchemical composition limits of the alloy by the meth
11、oddescribed in Annex A2. The densities of foil or sheet alloysdetermined in this manner are accurate to within 6 0.3 %.5.2.2 Calculated densities for some of the common foil orsheet alloys can be found in Table 1. A column headed “mils/gfor 8.000-in.2Area” is added for convenience in determiningthic
12、kness of the 8.000-in.2(51.613-cm2) specimens. The massof the specimen in grams multiplied by this factor is equal tothe thickness of the foil or sheet in mils. One mil is equal to0.001 in. (0.0254 mm).6. Precision and Bias6.1 Following the procedure outlined in this test method,repeated mass measur
13、ements of the same specimen on different1This test method is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.05 onTesting.Current edition approved Oct. 1, 2013. Published October 2013. Originallyapproved in 1964. Last previo
14、us edition approved in 2006 as E252 06. DOI:10.1520/E0252-06R13.2For 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 websi
15、te.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1balances should result in agreement within 1 mg. It is outsideof the scope of this test method to describe maintenance
16、 andcalibration procedures for balances, but disagreement largerthan 1 mg warrants attention to maintenance or recalibration ofthe balance.ANNEXES(Mandatory Information)A1. SPECIMEN SIZE AND SHAPE AND ITS EFFECT ON ACCURACYA1.1 GeneralA1.1.1 Specimens of sizes and shapes other than the 8.000-in.2(51
17、.613-cm2) circle maybe used provided consideration isgiven to controllable factors affecting the accuracy of themethod. Specifically, the area of the specimen shall be knownand controlled to an accuracy of 60.1 %, and the minimummass of the specimen shall be 70 mg. Specimens ranging insize from 8 to
18、 32 in.2(52 to 206 cm2) are convenient to handleand can be prepared to meet the aforementioned requirements.A1.2 Source of ErrorA1.2.1 Inherent errors in determining thickness by the massmeasurement method result from the limits on the accuracy ofthe density value assigned to the alloy, the accuracy
19、 with whicha specimen can be cut and its area determined, and theaccuracy of the mass measurement. Much time could bedevoted to a discussion of refinement of errors but it shallsuffice here to draw on experience as a guide for determiningthe accuracy of the method.A1.3 Error from Uncertainty of the
20、Densities of the Speci-men (ED)A1.3.1 The density of aluminum foil or sheet alloys shall bethose listed in Table 1 or it shall be determined by the methoddescribed in Annex A2. Values so obtained are accurate to6 0.3 % of the true density. The error imposed by uncertaintyof the density then is ED= 6
21、 0.3 % of the thickness deter-mined.A1.4 Error from Control of the Area of the Specimen (EA)A1.4.1 Aprecision blanking press can cut a specimen whosearea is known and reproducible to an accuracy of 60.1 %. If dis the specific diameter required to provide the area used in thethickness computation, th
22、en the error in area resulting from asmall error, d, in the diameter is 200 d/d %. It follows thenthat to maintain an area accurate to 60.1 %, the tolerance onthe diameter of the blanked circle shall be 60.0005 times thecircle diameter. The fact that the tolerance on diameter de-creases in direct pr
23、oportion to the diameter is a factor toconsider in selecting the specimen size to use in the method.Compliance with this tolerance limits the area error toEA= 6 0.1 % of the thickness determined.A1.5 Error from Measuring the Mass of the Specimen(EM)A1.5.1 The accuracy of measuring the mass of a foil
24、 orsheet specimen has been found to be 0.7 mg. This imposes amaximum error on the method of 6 0.07/(TAD) % of thethickness determined. Since D, density of the foil or sheet, isfixed, it is seen that the magnitude of the mass measurementTABLE 1 Densities of Aluminum Foil or Sheet Alloys Applicableto
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