1、Designation:D64613Standard Test Method forMass Per Unit Area of Paper and Paperboard of AramidPapers(Basis Weight)1This standard is issued under the fixed designation D646;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of l
2、ast 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.Scope1.1 This test method covers the determination o
3、f the massper unit area of paper and paperboard.1.2 In the SI metric units system,the mass per unit area ofpaper and paperboard is expressed in grams per square meter(g/m2).1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4
4、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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents
5、2.1 ASTM Standards:2D123 Terminology Relating to TextilesD685 Practice for Conditioning Paper and Paper Productsfor TestingD1776 Practice for Conditioning and Testing Textiles3.Summary of Test Method3.1 The area of several sheets of the paper or paperboard isdetermined from linear measurements and t
6、he mass is deter-mined by weighing.The test-result is calculated from the ratioof the mass to the area.4.Significance and Use4.1 Most paper is bought and sold in accordance with itsmass per unit area,and therefore has great significance both tothe consumer and the producer in defining price.Also,the
7、values of many physical properties such as bursting strength,thickness,and bulk are interpreted and specified with regard tothe particular mass per unit area involved.5.Apparatus5.1 Weighing Device,readable and accurate to within0.25%of the applied load.When in use,the weighing deviceshall be shield
8、ed from air currents.5.2 Cutting Device,such as a“four square”cutter,or otherdevice for ensuring right angles between the edges.5.2.1 When a template is used for preparing test specimens,the paper should be cut to exact size with a sharp knife on ahard surface,such as a hardwood board.5.3 Scale,such
9、 as a finely graduated steel rule reading in0.5 mm,capable of measuring the dimensions of the testspecimen to an accuracy of 0.2%.6.Sampling6.1 Sampling shall be consistent with documented internalpractices as agreed upon between sellers and buyers beforepurchase.6.2 From each test unit of the sampl
10、e,cut a sheet with adimension of 200 6 5 200 6 5 mm.7.Calibration7.1 Checking of Weighing Device:7.1.1 Check the accuracy of the weighing device frequently(7.3)by applying accurately measured masses with bothincreasing and decreasing loads.When using a sheet-weighingdevice,be sure that the device ha
11、s been properly calibrated tothe required accuracy(5.1).7.1.2 Before each use,see that frictional effects are suffi-ciently minimal and that the zero reading is sufficiently correctas to ensure the required weighing accuracy.7.2 Checking of Cutting DeviceFrequently(7.3)check thecutting by using the
12、scale(5.3)to measure the lengths of the1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.19 on Industrial Fibers andMetallic Reinforcements.Current edition approved July 1,2013.Published August 2013.Originallyapproved in
13、1941.Last previous edition approved in 2007 as D64696(2007)whichwas withdrawn February 2010 and reinstated in July 2013.This test method isrelated to TAPPI T 410 om-13,which is technically identical,and is similar toInternational Standard ISO 536,Paper and BoardDetermination of Grammage.DOI:10.1520/
14、D0646-13.2For 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,100 Barr Harbor Drive,PO Box
15、 C700,West Conshohocken,PA 19428-2959.United States1 four sides of 20 test specimens.Accuracy is attained when thestandard deviation of all lengths is less than 0.5%of the meanlength.7.3 Frequency of CheckingThe frequency of checking in7.1 and 7.2 should be based on experience.A new deviceshould be
16、checked several times before being put into use.Then,if in continuous use,it should be checked twice dailyuntil stability is established,then weekly,monthly,or lessfrequently as indicated by its stability,unless moved or undulydisturbed.Because of wear,the cutting device may requiremore frequent checking than the weighing device.8.Conditioning8.1 Condition and test the specimens in an atmosphere inaccordance with Practice D1776 or D685,unless the“asreceived”value is required.9.Procedure9.1 Cut t
