1、Designation: D531 00 (Reapproved 2010)Standard Test Method forRubber PropertyPusey and Jones Indentation1This standard is issued under the fixed designation D531; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. 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 of
3、the inden-tation of rubber or rubber-like materials by means of the Puseyand Jones type of plastometer. This apparatus is used tomeasure the depth of indentation of an indentor, under fixedforce into the surface of a specimen.1.2 The values stated in SI units are to be regarded as thestandard.1.3 Th
4、is 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 Documen
5、ts2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD1415 Test Method for Rubber PropertyInternationalHardnessD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesNOTE 1The specific dated edition of the practice t
6、hat prevails in thisdocument is referenced in the Section 9.3. Significance and Use3.1 The Pusey and Jones indentation value is the depth ofindentation, expressed in hundredths of a millimetre, of a ball3.175 mm (0.1250 in.) in diameter under an expressed force of9.8 N (2.2 lbf). This value may be u
7、sed to compare theindentation resistance of rubber and rubber-like materials.3.2 The indentation value obtained should not be confusedwith hardness as measured by Test Method D1415, since in thelatter test the rubber immediately adjacent to the indentor isprecompressed.4. Apparatus4.1 Plastometer, a
8、n instrument consisting of an indentor, amass for applying the stated force on the indentor, a microme-ter for indicating the depth of the indentation, a specimenholder and support.4.1.1 Indentor, for indenting the specimen, consisting of avertical steel shaft attached, at the upper end to a depthin
9、dicator gage, and terminating in a steel sphere having adiameter of 3.175 6 0.015 mm (0.1250 6 0.0005 in.) ofpolished, noncorrosive hard metal treated to resist wear.4.1.2 Mass, the mass shall be 1000 6 0.01 g.4.1.3 Depth Indicator Gage, a micrometer attached to theplastometer, either an electronic
10、digital gage or analog dialgage, capable of displaying indentor movement (indentation)in increments of at least 0.01 mm (0.0004 in.) and having travelof 0 (zero) to no less than 3 mm (0.12 in).4.1.4 Support, a support frame, or fixture, for the plastom-eter, shall be configured so that the specimen
11、holder and hence,the specimen, are perpendicular to the indentor support shaftand that the mass may be independently raised or loweredvertically, permitting the indentor to rest on the surface of thespecimen and the mass to be subsequently applied.4.1.5 Specimen Holder, for the standard, or referenc
12、e speci-men described in 5.1, shall consist of a clamping fixture of twometal plates secured by two threaded bolts. The uppermostplate shall have a hole and a slot, as depicted in Fig. 1, to allowfor the unencumbered introduction of the indentor to thespecimen.4.1.5.1 The purpose of the specimen hol
13、der is to support thespecimen in a manner that reduces, or eliminates, relativepositioning or movement that may adversely affect test deter-minations.1This test method is under the jurisdiction of ASTM Commitee D11 on Rubberand is the direct responsibility of Subcommittee D11.10 on Physical Testing.
14、Current edition approved Jan. 1, 2010. Published April 2010. Originallyapproved in 1939. Last previous edition approved in 2005 as D531 00 (2005).DOI: 10.1520/D0531-00R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Ann
15、ual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.5.2 In routine testing, a specimen holder, a support, orboth, of other,
16、 but similar, configurations may be employed toaccommodate specimens other than those described in 5.1,refer to 5.1.1.5. Test Specimens5.1 The standard, or reference, test specimen shall be auniform molded rectangular block a minimum of 13 mm (0.51in.) in thickness, 30 mm (1.18 in.) in width, and 75
17、 mm (2.95in.) in length. The upper and lower surfaces, those oppositesurfaces with the largest area, shall be parallel to within 60.5mm (60.20 in).5.1.1 The standard, or reference, test specimen shall be usedwhen the plastometer is employed for the purpose of determin-ing a standard, or reference, e
18、ither within or between labora-tories, that is, in other than routine testing.5.2 In routine testing, specimens may be used with aconfiguration other than those of the standard, or reference, testspecimen described in 5.1.6. Procedure6.1 Measurement of Indentation of Standard, or ReferenceSpecimens:
19、6.1.1 When measuring the indentation on a standard, orreference specimen as described in 5.1, secure it in thespecimen holder (refer to Fig. 1 and Section 4.1.5) with thebolts tightened sufficiently to hold it firmly without measurablecompression.6.1.2 Place the specimen holder on the support.6.1.3
20、Mount the plastometer over the specimen so that theindentor shaft is perpendicular to the support and hence thespecimen holder, to within 60.05 mm (60.002 in).6.1.4 The plastometer and support shall be placed upon aflat surface in a manner that prevents unsteadiness or move-ment other than described
21、 in 6.3.6.1.5 Lower the indentor shaft until the indentor is at themoment of contact with the specimen.6.1.5.1 Adjust the depth indicator gage to record indenta-tions up to 3 mm (0.12 in).6.1.5.2 Adjust the depth indicator gage so the displayindicates zero.6.1.6 Lower the mass onto the indentor, in
22、a fashion thateliminates shock, until the mass rests fully on the indentor.6.1.7 The amount of indentation displayed on the depthindicator gage 60 s (61 s) after the application of a total forceof 9.8 N, shall be recorded.6.1.8 Make no less than 3 such determinations on thespecimen at least 13 mm (0
23、.51 in) apart and from any edge.6.1.9 The median of the determinations, expressed as awhole number indicating hundredths of millimetres, shall bereported as the Pusey and Jones Indentation Value, refer to8.1.1.6.2 Measurement of Indentation of Specimens for RoutineTests (Nonstandard Specimens):6.2.1
24、 When making determinations on specimens other thanthose described in 5.1, specimen holders, supports or othersuitable fixturing, similar to those previously described, may beemployed and the procedure in 6.1 may be followed, other-wise:6.2.2 Mount the plastometer over, or directly upon, thespecimen
25、, so that the indentor shaft is vertical and perpendicu-lar to the specimen surface and both are level, as determined bymeans of a spirit level or similar device.6.2.3 Position curved (convex or concave) or irregularlyshaped specimens, so that the center line of the indentor shaftis perpendicular to
26、 the tangent of the specimen at the point ofcontact of the indentor and that determinations shall be made inaccordance with 6.2.8.6.2.4 The plastometer and specimen, or any fixtures em-ployed, shall be secure and situated in a manner that preventsunsteadiness or movement other than described in 6.3.
27、6.2.5 Lower the indentor shaft until the indentor is at themoment of contact with the specimen.mm in.A, min 80 3.15B, min 30 1.2D 17 to 18 0.67 to 0.70E 11 to 12 0.43 to 0.47F 60 2.36FIG. 1 Holder for Test SpecimensD531 00 (2010)26.2.5.1 Adjust the depth indicator gage to record indenta-tions up to
28、3 mm (0.12 in).6.2.5.2 Adjust the depth indicator gage so the displayindicates zero.6.2.6 Lower the mass onto the indentor, in a fashion thateliminates shock, until the mass rests fully on the indentor.6.2.7 The amount of indentation displayed on the depthindicator gage 60 s (61 s) after the applica
29、tion of a total forceof 9.8 N, shall be recorded.6.2.8 Make no less than 3 such determinations on thespecimen at least 13 mm (0.51 in) apart and from any edge.6.2.9 The median of the determinations, expressed as awhole number indicating hundredths of millimetres, shall bereported as the Pusey and Jo
30、nes Indentation Value, refer to8.1.1.6.2.10 When tests are performed on specimens other thanthose described in 5.1 and without the specimen holder andsupport the results shall be compared only to those obtained onsimilarly configured specimens under similar conditions.6.3 VibratorA small vibrator th
31、at is activated prior to themass being applied to the indentor and operates continuouslyduring a test to overcome any friction in the apparatus. Aninstrument that vibrates approximately 120 times per s, with anamplitude of vibration of the fixed platform of the testervarying from approximately 0.002
32、 to 0.005 mm (0.0001 to0.0002 in.), has been found satisfactory.6.4 Such a vibrator may consist of a simple-cored solenoidfastened to the top of a C-shaped piece of strap steel. The lowerpart of the solenoid core is a loose cylindrical piece of steelwith a shoulder at its lower end. When the current
33、 is off, theloose-cored section rests on a screw projecting from the bottomof the C-shaped support. When the current is on, the loose-cored section is attached to the solenoid but is restrained by aflat split ring of spring brass through which the cored sectionpasses, and which bears on the shoulder
34、 of the cored section.The cored section is caused to vibrate by the alternating forcesof attraction by the solenoid and repulsion by the flat ringacting as a spring. A small plate bearing a toggle switch forclosing the circuit to the solenoid is fastened to the top of theC-shaped piece of strap stee
35、l by means of the same bolt thatholds the solenoid. The bottom of the C-shaped piece isfastened by screws to a portion of a brass nut that serves toclamp the vibrator to one upright post of the tester.7. Laboratory Atmosphere and Test SpecimenConditioning7.1 The tests shall be conducted in the stand
36、ard laboratoryatmosphere as defined in Practice D618, Terminology: “stan-dard laboratory atmosphere.”7.2 Test specimen conditioning shall be in accordance withPractice D618, Standard Procedures for Conditioning Prior toTest: Procedure A.7.3 These conditions may be modified if agreed uponbetween labo
37、ratories or between supplier and user and are inaccord with the alternative procedures described in PracticeD618.7.4 When tests are conducted, within a laboratory, forpurposes of research, development, or empirical study andreported beyond that laboratory, the conditions shall be re-ported in accord
38、ance with Practice D618.8. Report8.1 State that the test was made in accordance with thisdesignation and include the following information:8.1.1 The Pusey and Jones indentation number,8.1.2 Description of test specimen including dimensions,8.1.3 Date of vulcanization, if known,8.1.4 Duration and tem
39、perature of vulcanization, if known,8.1.5 Temperature of test room, and8.1.6 Date of test.9. Precision and Bias39.1 These precision statements have been prepared in ac-cordance with Practice D4483. Refer to Practice D4483 forterminology and other testing and statistical concepts.9.2 The Pusey and Jo
40、nes Indentation Plastometer is usedmainly in the rubber roll industry. In this program no inter-laboratory precision data were obtained due to the limited useof this test method. The precision program consisted of tests byone operator on three different (in-house) instruments on threedifferent days.
41、 Four materials were tested. A test result is themedian value of three separate (determinations) indentationmeasurements.9.3 Table 1 gives the within and among “instrument”precision. Repeatability refers to within instrument variation;3Supporting data have been filed at ASTM International Headquarte
42、rs and maybe obtained by requesting Research Report RR:D11-1028.TABLE 1 Special Precision ResultsPusey and Jones IndentationMaterial Mean LevelWithin InstrumentABetween InstrumentAS(w) r(w)(r)(w) S(B) r(B)(r)(B)1 11.7(a) 0.265 0.750 6.4 0.374 1.06 9.12 20.9 0.296 0.838 4.0 0.309 0.875 4.23 38.1 0.37
43、9 1.073 2.8 0.668 1.89 5.04 63.0 0.192 0.543 0.86 1.67 4.73 7.5AS(w) = within instrument, standard deviation.r(w) = repeatability (within instrument) measurement units.(r)(w) = repeatability (within instrument), %.S(B) = between instrument, standard deviation.r(B) = repeatability (between instrument
44、) measurement units.(r)(B) = repeatability (between instrument), %.(a) = Pusey and Jones indentation number.D531 00 (2010)3reproducibility refers to among (between) instrument variation,with the same operator for both.9.4 BiasIn test method statistical terminology, bias is thedifference between an a
45、verage test value and the reference ortrue test property value. Reference values do not exist for thistest method since the value or level of the test property isexclusively defined by the test method. Bias, therefore, cannotbe determined.10. Keywords10.1 hardness; indentation hardness; relative har
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49、 the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D531 00 (2010)4
