1、Designation: D3851 07 (Reapproved 2012)Standard Specification forUrethane Microcellular Shoe Soling Materials1This standard is issued under the fixed designation D3851; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers urethane microcellular materi-als for shoe soling applications. It provides physical propertyr
3、equirements and identifies test methods for determining thosespecific properties.1.2 SI units are to be regarded as the preferred units ofmeasurements for values. The inch-pound values in parenthe-ses can be used if there is an agreement between the contractualparties.NOTE 1There is no known ISO equ
4、ivalent to this standard.2. Referenced Documents2.1 ASTM Standards:2D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD792 Test Methods for Density and Specific Gravity (Rela-t
5、ive Density) of Plastics by DisplacementD1052 Test Method for Measuring Rubber DeteriorationCut Growth Using Ross Flexing ApparatusD1622 Test Method for Apparent Density of Rigid CellularPlasticsD1938 Test Method for Tear-Propagation Resistance (Trou-ser Tear) of Plastic Film and Thin Sheeting by a
6、Single-Tear MethodD2240 Test Method for Rubber PropertyDurometer Hard-nessD3489 Test Methods for Microcellular Urethane Materials3. Classification3.1 This specification covers three grades of microcellularurethane materials that may be selected for use according toabrasion resistance, cut-growth res
7、istance, and other physicalproperties. The grades are classified as Grade 1, Grade 2, andGrade 3.4. Ordering Information4.1 Any product represented as complying with this speci-fication shall meet all the requirements listed herein for itsparticular classification.5. Physical Requirements5.1 The mat
8、erial shall conform to requirements for physicalproperties prescribed in Table 1.6. Test Methods6.1 The physical tests shall be in accordance with TestMethod D3489.7. Inspection7.1 Inspection of the material shall be agreed upon inwriting between the purchaser and the supplier as part of thepurchase
9、 contract.7.2 Testing for conformance to requirements shall be donein accordance with this specification and Test Methods D3489.8. Retest and Rejection8.1 If any failure occurs, the materials may be retested toestablish conformity in accordance with agreement betweenthe purchaser and the seller.9. P
10、ackaging, Marking, and Labeling9.1 PackagingThe material shall be packed in standardcommercial containers, so constructed as to ensure acceptanceby common or other carriers for safe transportation at thelowest rate to the point of delivery, unless otherwise specifiedin the contract or order.9.2 Mark
11、ingThe shipping container shall be marked withthe name, type, and quality of material in accordance with thecontract or order under which the shipment is made. Theshipping container shall also be marked with the name of themanufacturer and the contract or order number.9.3 LabelingIn order that purch
12、asers may identify prod-ucts complying with all requirements of this specification,producers choosing to produce such products in conformance1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.22 on CellularMaterials - P
13、lastics and Elastomers.Current edition approved Aug. 1, 2012. Published October 2012. Originallyapproved in 1980. Last previous edition approved in 2007 as D3851 07. DOI:10.1520/D3851-07R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at servi
14、ceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*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
15、 States1with this voluntary specification may include a statement inconjunction with their name and address on labels, invoices,sales literature, and the like. The following statement issuggested.9.3.1 “This product conforms to all the requirements forGrade _ established in ASTM Standard Specificati
16、onD3851. Full responsibility for conformance of this productwith the standard is assumed by (name and address ofconverter or distributor).10. Keywords10.1 footwear; microcellular; polyurethane; shoe; shoe sol-ing; sole; urethaneAPPENDIX(Nonmandatory Information)X1. METHODS FOR DETERMINING MATERIAL S
17、HRINKAGEX1.1 RationaleX1.1.1 Any material shrinkage has the potential to affectprocessing (such as ease of removal of parts from molds) andthe finished parts dimensions. Minimum and maximum re-quirements for shrinkage shall be agreed on between thepurchaser and the supplier. Two examples of procedur
18、es formeasuring that material shrinkage are given below.X1.2 Procedure AX1.2.1 Measure the length of the cavity of the mold to thenearest 0.5 mm or 0.02 in. Make the measurement with themold at room temperature.X1.2.2 Mold at least three sound test parts from the materialto be tested under such cond
19、itions of pressure, temperature,flow rates, time, etc., as the manufacturer and the purchasermay agree are suitable for the material.X1.2.3 After removal from the mold, allow the parts to coolto room temperature before being measured. The period ofstorage for initial molding shrinkage shall be 2 6 0
20、.25 h.Measure the length of each part to the nearest 0.5 mm or 0.02in. Measure the parts again not less than 20 nor more than 24h to obtain the “24-h shrinkage,” and again not less than 40 normore than 48 h after molding, in order to determine the “48-h”or “normal” mold shrinkage.X1.2.4 Calculate th
21、e percent shrinkage by subtracting thedimension of the specimen from the corresponding dimensionof the mold cavity in which it was molded, multiply by 100,and divide the difference by the length of the mold cavity.X1.2.5 Repeat the initial, 24-h, and 48-h shrinkage ex-pressed in percent and each rep
22、resenting the mean of valuesobtained on three or more specimens.X1.3 Procedure BX1.3.1 After removal form the mold, allow the part andmold to cool to room temperature. The period of cooling shallbe 2 6 0.25 h.X1.3.2 Measure the length of the cavity of the mold to thenearest 0.02 mm or 0.001 in.X1.3.
23、3 Measure the length of the part to the nearest 0.02mm or 0.001 in.TABLE 1 Physical Property Requirements on Polyurethane Shoe SystemsPropertyGradeASTMMethod123DensityAAAD792, D3489,or D1622Tensile strength, min, MPa (psi) 4.9 (700) 3.5 (500) 2.8 (400) D412Ultimate elongation, min, % 300 275 250 D41
24、2Tear, Die C, min, kN/m (lbf/in.) 22.0 (125) 22.0 (125) 17.5 (100) D624Tear, min, kN/m (lbf/in.) 11.5 (65) 7.0 (40) 4.4 (25) D1938Hardness, Shore A DurometerAAAD2240Cut-growth resistance, minimum cycles at: D105220F0F75F30 00075 000150 00010 00030 00075 00010 00020 00050 000Taber abrasion (wear inde
25、x), H-18 wheel, 1000 g, 1000 cycles 100 200 300 D3489AAs agreed upon between the purchaser and the seller.D3851 07 (2012)2X1.3.4 Material ShrinkageCalculate the percent changeas follows:% change in length 5Lm2 LpLm3100 (X1.1)where:Lm= length of mold at room temperature, andLp= length of molded part
26、at room temperature.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement
27、 of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or fo
28、r additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known
29、 to 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/).D3851 07 (2012)3
