1、Designation: D 3851 07Standard Specification forUrethane Microcellular Shoe Soling Materials1This standard is issued under the fixed designation D 3851; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A n
2、umber in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 propertyrequirements and
3、 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 bracketscan be used if there is an agreement between the contractualparties.NOTE 1There is no known ISO equivalent to this stan
4、dard.2. Referenced Documents2.1 ASTM Standards:2D 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD 624 Test Method for Tear Strength of ConventionalVulcanized Rubber and Thermoplastic ElastomersD 792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Pla
5、stics by DisplacementD 1052 Test Method for Measuring Rubber DeteriorationCut Growth Using Ross Flexing ApparatusD 1622 Test Method for Apparent Density of Rigid CellularPlasticsD 1938 Test Method for Tear-Propagation Resistance(Trouser Tear) of Plastic Film and Thin Sheeting by aSingle-Tear MethodD
6、 2240 Test Method for Rubber PropertyDurometerHardnessD 3489 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 resistance, and other
7、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 material shall conform
8、 to requirements for physicalproperties prescribed in Table 1.6. Test Methods6.1 The physical tests shall be in accordance with TestMethod D 3489.7. Inspection7.1 Inspection of the material shall be agreed upon inwriting between the purchaser and the supplier as part of thepurchase contract.7.2 Test
9、ing for conformance to requirements shall be donein accordance with this specification and Test Methods D 3489.8. 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. Packaging, Marking
10、, 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 MarkingThe shipping c
11、ontainer 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 purchasers may identif
12、y 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 - Plastics and Elast
13、omers.Current edition approved Nov. 1, 2007. Published November 2007. Originallyapproved in 1980. Last previous edition approved in 2003 as D 3851 97(2003)e1.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of A
14、STMStandards 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.with this voluntary specification may include a statement inconjunction with their name
15、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 SpecificationD 3851. Full responsibility for conformance of this productwith the standard is assumed by (na
16、me and address ofconverter or distributor).10. Keywords10.1 footwear; microcellular; polyurethane; shoe; shoe sol-ing; sole; urethaneAPPENDIX(Nonmandatory Information)X1. METHODS FOR DETERMINING MATERIAL SHRINKAGEX1.1 RationaleX1.1.1 Any material shrinkage has the potential to affectprocessing (such
17、 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 procedures formeasuring that material shrinkage are given below.X1.2 Procedure AX1.2.1 Measure the leng
18、th 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 conditions of pressure, temperature,flow rates, time, etc., as the manufacturer and the purchaserma
19、y 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 0.25 h.Measure the length of each part to the nearest 0.5 mm or 0.02in. Measure the parts again
20、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 the percent shrinkage by subtracting thedimension of the specimen from the corresponding dimensio
21、nof 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 representing the mean of valuesobtained on three or more specimens.X1.3 Procedure BX1.3.1 After re
22、moval 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.X1.3.3 Measure the length of the part to the nearest 0.02mm or 0.001 in.TABLE 1 Physical Property Re
23、quirements on Polyurethane Shoe SystemsPropertyGradeASTMMethod123DensityAAAD 792or D 1622Tensile strength, min, MPa psi 4.9 700 3.5 500 2.8 400 D 412Ultimate elongation, min, % 300 275 250 D 412Tear, Die C, min, kN/m lbf/in. 22.0 125 22.0 125 17.5 100 D 624Tear, min, kN/m lbf/in. 11.5 65 7.0 40 4.4
24、25 D 1938Hardness, Shore A DurometerAAAD 2240Cut-growth resistance, minimum cycles at: D 105220F0F75F30 00075 000150 00010 00030 00075 00010 00020 00050 000Taber abrasion (wear index), H-18 wheel, 1000 g, 1000 cycles 100 200 300 D 3489AAs agreed upon between the purchaser and the seller.D3851072X1.3
25、.4 Material ShrinkageCalculate the percent change as follows:% change in length 5Lm LpLm3 100 (X1.1)where:Lm= length of mold at room temperature, andLp= length of molded part at room temperature.ASTM International takes no position respecting the validity of any patent rights asserted in connection
26、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 of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible te
27、chnical 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 for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consider
28、ation 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 to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr
29、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).D3851073
