1、Designation:F 142 93(Reapproved 2000)e1Standard Test Method forIndentation of Resilient Floor Tiles(McBurney Test)1This standard is issued under the fixed designation F 142;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.e1NOTEThe addresses in Footnotes 4 and 5 were update
3、d editorially in October 2000.1.Scope1.1 This test method2covers the determination of theindentation of resilient nontextile floor tiles,such as vinylcomposition.1.2This standard does not purport to address all of thesafety problems,if any,associated with its use.It is theresponsibility of the user
4、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 ASTM Standards:E 1 Specification for ASTM Thermometers33.Significance and Use3.1 This test method measures the tendency of resilien
5、t tileto indent under continuous loads.The slope,m of a plot of logindentation(I)versus log time(T)is related to the indentationof tile in service.The 46C(115F)indentation is a measure ofthe tendency of the tile to indent at temperatures above 25C(77F).Consult the reference in footnote 2 for further
6、 infor-mation.3.2 This test method does not measure the effect of recoveryfrom indentation or of aging of the tile on indentation inservice.4.Apparatus4.1 Water Baths,or atmosphere maintained at 25 6 0.5C(77 6 0.9F)and 46 6 1C(114.8 6 1.8F).4.2 Indentation Tester4,5The indentation tester is a spheri
7、-cal foot device consisting essentially of a rigidly mountedindentor acting under an initial load of 2.00 6 0.02 lbf(8.90 60.09 N)and a total deadweight load of 30.00 6 0.25 lbf(133.45 6 1.11 N)with a suitable dial indicator,calibrated in0.0005 in.(0.01 mm)increments.The spherical foot shall be0.250
8、 6 0.0005 in.(6.35 6 0.01 mm)in diameter.A suitableapparatus is shown in Fig.1.4.3 Flat Glass Plate,of 0.25 in.(6.35 mm)minimumthickness for supporting the specimen and tester during test.4.4 Timing Device,that will indicate the time in seconds.4.5 Thermometer,calibrated as in Specification E 1.4.6
9、Circular Plexiglass Template,3.50 in.(88.9 mm)indiameter,0.25 in.(6.35 mm)thick and having a 0.3125 in.(7.94 mm)diameter hole drilled in the center and a 0.75 in.(19.05 mm)diameter concentric circle etched on the face.5.Test Specimen5.1 The test specimen shall be a full tile,usually 12 by 12 in.(app
10、roximately 300 by 300 mm)or 9 by 9 in.(approximately230 by 230 mm).Larger tiles shall be cut to one of the abovesizes.6.Conditioning6.1 Testing in Atmospherecondition the specimen(s)for 1h at the test temperature.6.2 Testing in Watercondition the specimen(s)at the testtemperature for 15 min minimum
11、and 30 min maximum.6.3 Condition the indentation tester and glass plate in thesame medium and for at least the same time period as thespecimen(s).7.Procedure7.1 Nonembossed Surfaces:7.1.1 Place the specimen on the glass plate with the wearingsurface up.7.1.2 Place the indentor on the specimen.Be sur
12、e theindentor tip is retracted into the base when the instrument isplaced on the specimen and when being moved to another testlocation.7.1.3 Apply the initial 2-lbf(8.9-N)load(shaft assembly)tothe specimen surface.Proper 2-lbf loading and positioning ofthe 28-lbf(124.5-N)load is accomplished by hold
13、ing down,with the thumb,the shaft cross bar facing you and gently1This test method is under the jurisdiction ofASTM Committee F06 on ResilientFloor Coverings and is the direct responsibility of Subcommittee F06.30 on PhysicalService Properties.Current edition approved Nov.15,1993.Published January 1
14、994.Originallypublished as F 142-71.Last previous edition F 142-82(1987)e1.2McBurney,J.W.,“Indentation of Asphalt Tile,”Proceedings,ASTEA,ASTM,Vol 34,Part II,1934,p.591.3Annual Book of ASTM Standards,Vol 14.03.4Instructions on the care and maintenance of the McBurney Indentation Testerare available
15、from the Resilient Floor Covering Institute,401 East Jefferson Street,Suite 120,Rockville,MD 20850.5McBurney Indentation Testers may be purchased from Frazier PrecisionInstrument Co.,925 Sweeney Drive,Hagerstown,MD 217407123.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,Unite
16、d States.lowering the load until the shaft cross bar is forced upwarduntil there is essentially no clearance between the shaft crossbar and the upper wear plate.7.1.4 Set the dial gage at zero.7.1.5 Release the 28-lbf(124.5-N)load and start the timingdevice.(Steps 7.1.3-7.1.5 should not exceed a total of 5 s.)Load release should be smooth and as mechanical as possible.Turn the collar at least one-half turn beyond release to allowsufficient travel for indentation.Do not hold the collar handleafte