1、Designation: D 2632 01 (Reapproved 2008)Standard Test Method forRubber PropertyResilience by Vertical Rebound1This standard is issued under the fixed designation D 2632; 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 determinat
3、ion of impactresilience of solid rubber from measurement of the verticalrebound of a dropped mass.1.2 This test method is not applicable to the testing ofcellular rubbers or coated fabrics.1.3 A standard test method for impact resilience and pen-etration of rubber by a rebound pendulum is described
4、in TestMethod D 1054.1.4 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.5 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 stan
5、dard 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:2D 618 Practice for Conditioning Plastics for TestingD 832 Practice for Rubber Conditioning For Low Tempera-ture TestingD 1054
6、Test Method for Rubber PropertyResilience Us-ing a Goodyear-Healey Rebound PendulumD 1349 Practice for RubberStandard Temperatures forTestingD 1566 Terminology Relating to RubberD 3182 Practice for RubberMaterials, Equipment, andProcedures for Mixing Standard Compounds and Prepar-ing Standard Vulcan
7、ized SheetsD 3183 Practice for RubberPreparation of Product Piecesfor Test Purposes from ProductsD 4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustries2.2 Other Documents:3ISO-10012-1 Quality Assurance Requirements for Measur-ing Equi
8、pmentPart 1: Metrological Confirmation Sys-tem for Measuring Equipment4ANSI/NCSL-Z540-1 American National Standard forCalibrationCalibration Laboratories and Measuring andTest EquipmentGeneral Requirements53. Summary of Test Method3.1 Resilience is determined as the ratio of rebound heightto drop he
9、ight of a metal plunger of prescribed mass and shapewhich is allowed to fall on the rubber specimen.4. Significance and Use4.1 Resilience is a function of both dynamic modulus andinternal friction of a rubber. It is very sensitive to temperaturechanges and to depth of penetration of the plunger. Con
10、se-quently, resilience values from one type of rebound instrumentmay not, in general, be predicted from results on another typeof rebound instrument.4.2 This test method is used for development and compari-son of materials. It may not directly relate to end-use perfor-mance.5. Apparatus5.1 A diagram
11、 of the essential features and dimensions ofthe apparatus appears in Fig. 1. It includes means for suspend-ing a plunger at a given height above the specimen, its release,and measuring the subsequent rebound height.5.1.1 Each resilience instrument shall have a unique identi-fication number assigned
12、and permanently and visibly im-printed or affixed upon it.5.2 The plunger dimensions are also given in Fig. 1. Itsmass shall be 28 6 0.5 g.1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.14 on Time and Temperature-Depend
13、ent Physical Properties.Current edition approved Nov. 1, 2008. Published February 2009. Originallyapproved in 1967. Last previous edition approved in 2001 as D 2632 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual
14、 Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3This test method previously referenced MIL-STD-4662a Military Standard:Calibration System Requirements, which was subsequently canceled by the Depart-ment of Defense in February 1995. These ar
15、e the DoD recommended replacementdocuments.4Available from the International Organization for Standardization, 1 rue deVaremb, Case postale 56, CH-1211, Geneva 20, Switzerland.5Available from the American National Standards Institute, 25 W. 43rd St., 4thFloor, New York, NY 10036.1Copyright ASTM Inte
16、rnational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3 The height of the drop point and of the resilience scaleabove the base of the instrument shall be adjustable so that thedrop height is always 400 6 1mm(166 0.04 in.) above thespecimen surface. The resi
17、lience scale shall be marked in 100equally spaced divisions.5.3.1 The top of the plunger should be in line with 100 onthe scale when the plunger is locked in the elevated position.Some models of the apparatus do not meet this requirement,but may be modified to do so.5.4 The descent of the plunger an
18、d its ensuing ascent(rebound) is guided by a vertical rod (plunger guide). In orderto minimize friction between the plunger and the vertical rod,a means shall be provided for leveling the base of theinstrument and adjusting the perpendicularity of the verticalrod to the instrument base.5.4.1 The bot
19、tom of the vertical rod shall havea4mmdiameter sharp point formed by a 60 angle, to secure thelocation of the bottommost end of the vertical rod. This pointshould indent the test specimen, providing a secure location forthe free end of the guide rod.5.4.2 The plunger shall be allowed to rest at the
20、lowest pointof travel and act as a guide to position the rod in the center ofthe stabilizer, as is visually practical under 103 magnification,as it is lowered onto the test specimen.5.5 An opaque shield may be mounted between the operatorand the plunger scale to be used for pass-fail test determina-
21、tions. In use, the shield is adjusted so that its upper edge (orcentral-most graduation within a range) is even with thedesired test determination. If the top of the rebounding plungeris visible above the shield (or within graduations demarcatinga predetermined range of acceptability), the specimen
22、passes.6. Test Specimen6.1 Mixing, sheeting, and curing shall be performed inaccordance with Practices D 3182 and D 3183, unless other-wise specified.6.2 The standard test specimen shall have a thickness of12.5 6 0.5 mm (0.50 6 0.02 in.). The specimen shall be cutfrom a slab or specifically molded s
23、o that the point of plungerFIG. 1 Vertical Rebound ApparatusD 2632 01 (2008)2impact is a minimum distance of 14 mm (0.55 in.) from theedge of the specimen.6.2.1 Any variation from the standard test specimen shall bereported (see 11.3).6.3 Alternative specimens may be prepared by plyingsamples cut fr
24、om a standard test slab. These samples shall beplied, without cementing, to the thickness required. Such pliesshall be smooth, flat, and of uniform thickness. The resultsobtained with these specimens will not necessarily be identicalwith those obtained using a solid specimen of the samematerial and
25、state of cure.6.3.1 A thin specimen reaches a higher state of cure at agiven time and temperature of cure than does a thickerspecimen. Therefore, if plied specimens are used, their curetime should be appropriately lower than that of unpliedspecimens used for comparison.6.4 Specimens may be prepared
26、from finished products bycutting and buffing to the required dimensions, making surethat the opposing faces are parallel and that grain direction,where applicable, is uniform.6.4.1 When buffing is required, it is recommended that onlyone side be buffed and the unbuffed side tested or, if both sidesm
27、ust be buffed, comparisons should not be made betweenbuffed and unbuffed specimens.7. Calibration7.1 All materials, instruments, or equipment used for thedetermination of force, mass, or dimension in the calibration ofthis instrument or mechanical spring calibration device shall betraceable to the N
28、ational Institute for Standards and Technol-ogy (NIST) or other internationally recognized organizationparallel in nature and scope.7.2 Calibration Device:7.2.1 A mechanical spring calibration device (see Fig. 2)shall be used to calibrate this instrument.67.2.2 The force required to fully compress t
29、he spring, priorto being mounted in the receptacle, shall be 8.06 6 0.081 N(822 6 8.22 g).7.2.3 The mechanical spring calibration device shall have aunique identification number assigned and permanently andvisibly imprinted or affixed upon it.7.2.4 The resilience values assigned to an instrument usi
30、ngthe mechanical spring calibration device shall be established atthe time of calibration.7.3 Calibration Procedure:7.3.1 The instrument shall be situated on a flat, level,vibration-free platform. The instrument shall be adjusted sothat it is plumb and level, verified either by the integral level or
31、by an external device designed for this purpose and inaccordance with the manufacturers instructions.7.3.2 Perpendicularity of the vertical rod (plunger guide) tothe support surface shall be verified by a device designed forthis purpose and in accordance with the manufacturers instruc-tions.7.3.3 Th
32、e dimensions and mass of the plunger (see 5.2 andFig. 1), the scale graduations, height of the drop point, and ofthe resilience scale above the base of the instrument (see 5.3and Fig. 1) shall be verified by devices designed for thispurpose.7.3.4 The calibration procedure shall be performed in thest
33、andard laboratory atmosphere as defined in Practice D 618.The instrument, mechanical spring calibration device, and anyinstrument or equipment used in the calibration procedure shallequilibrate at the standard laboratory temperature for a mini-mum of 12 h prior to performing the calibration.7.3.5 Si
34、tuate the mechanical spring calibration device se-curely in the instrument as described in Section 5 and inaccordance with the manufacturers instructions.7.3.6 Make three sets of five readings, averaging each set.Each set becomes a test determination. Average the three testdeterminations to the near
35、est whole number. This wholenumber becomes the resilience calibration value for the instru-ment.7.3.7 The instrument shall be considered in calibration if theresilience calibration value is within 62 points of the resiliencecalibration value established for the mechanical spring calibra-tion device.
36、7.3.8 The resilience calibration value is assigned to themechanical spring calibration device by the manufacturer or bythe calibration service supplier using an identical resilienceinstrument, following the procedure outlined herein.7.3.9 If the instrument is provided with a mechanical springdevice,
37、 this device shall have a resilience calibration valueassigned, following the procedure outlined herein. This devicemay be used to determine the state of calibration of theinstrument during routine testing at a frequency determined bythe user. It shall not be used as a calibration device.7.3.10 Cali
38、bration frequencies and calibration recordsshould be kept in accordance with procedures outlined in thedocuments described in 2.2 or as required by the usersproprietary quality system.7.4 The calibration report shall contain the following infor-mation:6The calibration device is available from Wilson
39、-Shore Instrument Company,Division of Instron Corporation, 100 Royall St., Canton, MA 02021, or from CCSi,Inc., 1145 Highbrook Ave., Suite 500, Akron, OH 44301.FIG. 2 Spring Calibration DeviceD 2632 01 (2008)37.4.1 Date of calibration.7.4.2 Date of last calibration.7.4.3 Manufacturer, type, model, a
40、nd serial number of theinstrument.7.4.4 Manufacturer, type, model, and serial number of themechanical spring calibration devices.7.4.5 Values obtained (pre- and post-calibration results),following the procedure outlined in 7.3.7.4.6 Ambient temperature.7.4.7 Relative humidity.7.4.8 Technician identi
41、fication.7.4.9 Applicable standards to which the instrument is cali-brated.7.4.10 Calibrating instrument information to include type,serial number, manufacturer, date of last calibration, and astatement of traceability of standards used to NIST or otheracceptable organization. See 7.1.8. Test Temper
42、ature8.1 Test procedures shall be performed in the standardlaboratory atmosphere as defined in Practice D 618 unlessotherwise agreed upon between customer and supplier orbetween laboratories.8.2 The instrument and test specimens shall be conditionedin the standard laboratory atmosphere as described
43、in PracticeD 618 unless otherwise agreed upon between customer andsupplier or between laboratories.8.3 When test procedures are conducted at temperatures orconditions other than those specified in 8.1 and 8.2, they shallbe chosen from those enumerated in Practices D 618, D 832,orD 1349 and the proce
44、dures described therein shall be followedunless otherwise agreed upon between customer and supplieror between laboratories.9. Procedure9.1 Level the instrument (see 7.3.1) and raise the plunger tothe top of its guide rod.9.2 Position the resilience scale (see 5.3) so that its full massrests upon the
45、 specimen (see 5.3.1). Lock it in this position.9.3 Release the plunger, ensuring that it slides freely on thevertical rod (plunger guide) (see 5.3.1).9.3.1 Lateral force or impact on the guide rod may result inthe hindrance of the descent of the plunger. Do not lubricateany part of the instrument.
46、Always keep a standard testspecimen under the stabilizer when not in use to avoid damageto the plunger.9.4 Test three specimens from the same sample, making sixtest determinations on each specimen. Refer to TerminologyD 1566 for definitions of specimen and sample and to PracticeD 4483 for definition
47、s of determinations and results.9.4.1 Do not reposition the specimen once the initial testdetermination has been made.9.4.2 Do not record the first three test determinations, asthese condition and stabilize the specimen.9.4.3 Record the last three test determinations.10. Calculations10.1 The instrum
48、ent scale is divided into 100 equal parts,therefore a test determination is equal to the resilience value inpercent.10.2 Average the 4th, 5th, and 6th test determinations (see9.4.3) from a specimen to calculate the test result from thespecimen.10.3 Average or alternatively, determine the median, the
49、 testresults from the three specimens to the nearest whole number.This whole number is the resilience value of the sample. Themedian may also be used.11. Report11.1 Report the test results from the specimens (see 10.2).11.2 Report the average or alternatively, the median, of thethree test results (see 10.3).11.3 Describe and report any variation from standard testspecimen or standard conditions.12. Precision and Bias12.1 This precision and bias section has been prepared inaccordance with Practice D 4483. Refer to this practice forterminology and other statistical cal
