1、Designation: D 6576 07Standard Specification forFlexible Cellular Rubber Chemically Blown1This standard is issued under the fixed designation D 6576; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numb
2、er 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. Replaces MIL-R-6130.1. Scope1.1 This specification establishes requi
3、rements for chemi-cally blown cellular rubber.1.2 In the case of conflict between the provisions of thisspecification and those of detailed specifications or test meth-ods for a particular product, the latter shall take precedence.1.3 Unless specifically stated otherwise, by agreement be-tween the p
4、urchaser and the supplier, all test methods shall beperformed in accordance with the test methods specified in thisspecification.1.4 The values stated in SI units are to be regarded as thestandard. The inch-pound units given in parentheses are forinformation only.1.5 This standard does not purport t
5、o 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.1.6 There is no known ISO equivalent to this specif
6、ication.NOTE 1This specification was revised using the updated test methodsand specifications in Specification D 1056 07.2. Referenced Documents2.1 ASTM Standards:2D 297 Test Methods for Rubber ProductsChemicalAnalysisD 471 Test Method for Rubber PropertyEffect of LiquidsD 635 Test Method for Rate o
7、f Burning and/or Extent andTime of Burning of Plastics in a Horizontal PositionD 883 Terminology Relating to PlasticsD 1055 Specifications for Flexible Cellular MaterialsLatex FoamD 1056 Specification for Flexible Cellular MaterialsSponge or Expanded RubberD 3575 Test Methods for Flexible Cellular M
8、aterials Madefrom Olefin Polymers2.2 SAE Standard:3SAE J 1351-1993 Hot Odor Test for Insulation Materials2.3 Military Standards/Specifications:4MIL STD 105 Sampling Procedures and Tables for Inspec-tion by AttributesMIL STD 129 Marking for Shipment and StorageMIL STD 293 Visual Inspection Guide for
9、Cellular RubberItemsMIL R 6130C Standard Specification for Flexible CellularRubber Chemically Blown2.4 Federal Standards/Specifications:4PPP-B576 Box, Wood, Cleated, Veneer, Paper OverlaidPPP-B591 Box, Fiberboard, Wood-CleatedPPP-B601 Box, Wood, Cleated PlywoodPPP-B621 Box, Wood, Nailed and Lock-Cor
10、nerPPP-B636 Box, Shipping, Fiberboard3. Terminology3.1 For definitions of technical terms pertaining to cellularflexible rubber used in this specification, refer to TerminologyD 883.3.2 Definitions:3.2.1 cellular materiala generic term for materials con-taining many cells (either open or closed, or
11、both) dispersedthroughout the mass.3.2.2 closed cella product whose cells are totally enclosedby its walls and hence not interconnecting with other cells.3.2.3 open cella product whose cells are not totallyenclosed by its walls and open to the surface, either directly orby interconnecting with other
12、 cells.4. Classification4.1 TypesThis specification covers two types of cellularrubber designated as follows:4.1.1 Type IOpen cell (sponge rubber).4.1.2 Type IIClosed cell (expanded rubber).1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibilit
13、y of Subcommittee D20.22 on CellularMaterials - Plastics and Elastomers.Current edition approved Sept. 1, 2007. Published October 2007. Originallyapproved in 2000. Last previous edition approved in 2000 as D 6576 - 00.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact AS
14、TM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/www.sae.org.4Available from Standa
15、rdization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 GradesBoth types are divided into three grades des-ignated by the letter
16、s A, B, and C added to the roman numeralprefix.4.2.1 Grade AOil- and flame-resistant.4.2.2 Grade BNo requirements for oil, flame resistance,or low temperature.4.2.3 Grade CLow-temperature resistant (oil and flameresistance not required).4.3 ConditionsEach type and class has been divided intothree di
17、fferent conditions. Each condition is based on a specificrange of firmness as expressed by compression deflection asfollows:4.3.4 ConditionSuper soft a compression deflec-tion range of0to#14 kPa(0 to #2 psi)4.3.2 ConditionSoft a compression deflec-tion range of14 to #35 kPa(2 to #5 psi)4.3.3 Conditi
18、onSoft-medium a compression deflec-tion range of35 to #63 kPa(5 to #9 psi)4.3.4 ConditionMedium a compression deflec-tion range of63 to #91 kPa(9to#13 psi)4.3.5 ConditionMedium-firm a compression deflec-tion range of91 to #119 kPa(13 to #17 psi)4.3.6 ConditionFirm a compression deflec-tion range of1
19、19 to #175 kPa(17 to #25 psi)5. Significance and Use5.1 This specification is a revision of MIL R 6130C retain-ing most of the MIL R 6130C material designations andproperty requirements while conforming to ASTM form andstyle. It is intended to establish requirements for chemicallyblown cellular rubb
20、er used by government and industry, and isintended as a direct replacement for MIL R 6130C.6. Materials and Manufacture6.1 MaterialsThe materials shall be homogeneous. Ex-cept for the following production allowances:6.1.1 Tears and edge cracks that do not interfere withspecified product yield.6.1.2
21、Depression and pock marks not exceeding 1 in.6.1.3 Splices and butt splices.6.1.4 Laminating sheets to achieve thickness.6.2 The material shall not include the following:6.2.1 Cemented, bonded, shredded, or reprocessed cellularrubber.6.2.2 Grade A cellular rubber shall not contain naturalrubber.6.3
22、FormChemically blown cellular rubber shall be fur-nished as sheets, rolls, or molded shapes as specified, and shallhave a uniform cell structure, with thin skin or rind surfaces.Cut or split sheets void of skin or rind surfaces may befurnished only for Type II material when specified.6.4 Skin or Rin
23、dThe surface formed by contact with themold shall be considered a skin or rind. It shall be of the samecompound, and vulcanized integrally with the cellular struc-ture. Type I shall have skin or rind. Type II may or may nothave skin or rind.6.5 Cut or Split Sheets (Type II Only)When two or moresheet
24、s are derived from one thick sheet, the cut or split sheetsshall not be required to posses a skin or rind on either majorsurface.6.6 SurfacingCellular rubber shall be backed or surfacedwith fabric, adhesive, or other materials, when and as specifiedin the contract or order or by applicable drawings.
25、7. Physical Properties7.1 The various types and grades of cellular rubber shallconform to the physical properties listed in Table 1 togetherwith any additional requirements indicated by suffix letters inthe grade designations as described in Section 4 and Table 2.8. Tolerances on Dimensions8.1 Toler
26、ances on dimensions of flexible cellular rubbermaterials are given in Table 3.8.2 Molded ShapesTolerance requirements for moldedshapes shall be as specified in drawings, contracts, or by theprocuring activity.8.3 Sheets and RollsUnless otherwise specified, the tol-erance requirements for thickness,
27、lengths and width of sheetsshall be as specified in Table 3.9. Test Methods9.1 Unless specifically stated otherwise, all test methodsshall be in accordance with the test methods specified inSections 10-18.9.2 Precision and BiasThe repeatability standard devia-tions for each test method has been dete
28、rmined. The reproduc-ibility of these test methods is being determined and will beavailable on or before March 2006.NOTE 2One laboratory tested one closed-cell, flame-resistant, non-oilresistant, 96-kg/m3, 14-35-kPa product as a representative sample. Thissample was used for shrinkage, recovery, and
29、 oil-resistance testing.10. Test Conditions10.1 Standard ConditionsUnless otherwise specifiedherein, conduct the test method at 23 6 2C (73.4 6 3.6F) anda relative humidity of 50 6 5%10.2 Specimen ConditioningUnless otherwise specified,condition all test specimens at standard conditions for at least
30、22 h prior to testing.11. Compression Deflection11.1 Test in accordance with Sections 17 to 22 of Specifi-cation D 1056.12. Low-Temperature Flex Resistance12.1 Test in accordance with Sections 56 to 60 of Specifi-cation D 1056. Exposure temperatures shall be in accordancewith Table 4.13. Accelerated
31、 Aging13.1 Test in accordance with Sections 34 to 41 of Specifi-cation D 1056.14. Recovery14.1 Specimen SizeRound test specimen shall be cut 41.36 1 mm (1.625 6 0.04 in.) in diameter. Specimens taken fromeither sheets or molded shapes shall have a minimum thicknessof 6.4 mm (0.250 in.) and a maximum
32、 thickness of 28.6 mm(1.125 in.). Skin on top face, or bottom face, or both, isD6576072allowed. Specimens shall be cut so that opposite edges areparallel. The thickness of the test specimens may vary, but shallbe measured and stated in the report. Measure the thickness ofeach test specimen to 0.0254
33、 mm (0.001 in.).14.2 Compress the specimen to 50 % of the original thick-ness for a period of 46 h 6 30 minutes.14.3 Remeasure the thickness of each specimen 24 h 6 15minutes after removal from the compression apparatus.14.4 Calculate the recovery as follows:recovery, % 5BA3 100 (1)where:A = origina
34、l thickness, andB = thickness 24 h 6 15 minutes after removal fromapparatus.TABLE 1 Physical PropertiesAPropertyType IBasic Requirements(Open Cell)Type IIBasic Requirements(Closed Cell)Test Method,SectionCompression deflection, kPa (psi), 25 %deflectionsuper soft 0 to #14 (0 to #2) 0 to #14 (0 to #2
35、) 11soft 14 to #35 (2 to #5) 14 to #35 (2 to #5)soft-medium 35 to #63(5 to #9)35 to #63(5 to #9)medium 63 to #91(9 to #13)63 to #91(9 to #13)medium-firm 91 to #119(13 to #17)91to#119(13 to #17)firm 119 to #175(17 to #25)119 to #175(17 to #25)Low-temperature resistance, flex, 180 bend Grade A 40C (40
36、F) pass pass 12Grade B 40C (40F) pass passGrade C 55C (67F) pass passAccelerated aging, % retention of original 25 %deflection after 7 days at 158Fall grades and conditions 620 % 630 % 13Recovery, min, %, after 50 % deflection all grades and conditions 90 60 14Flame resistance, max, s Grade A 30 30
37、15Grade B not required not requiredGrade C not required not requiredShrinkage, max, %, 7 days at 158F All grades and conditions not required 10 16Water Absorption, max, % all grades and conditions not required 10 % max for densities 10 lb/ft3andunder5 % max for densities over 10 lb/ft317Oil aging, %
38、 change in volume, IRM Oil 902 Grade A 15 to +30 15 to +30 18Grade B not required not requiredGrade C not required not requiredColor all grades and conditions as manufactured unlessotherwise specifiedas manufactured unlessotherwise specifiedvisualAUnless otherwise specified, the basic requirements l
39、isted are for all types, grades, and conditions.TABLE 2 Optional Requirements Added by Suffix LettersPropertyType IOptional Requirements(Open Cell)Type IIOptional Requirements(Closed Cell)Test MethodSectionSuffix H: Flexing, max, % set all grades and conditions 10 10 Appendix X1Suffix O: Odor in acc
40、ordance with SAEJ-1351all grades and conditions rating to be determined rating to be determined Appendix X1Suffix W: Density in accordance with TestMethods D 3575 or Specification D 1056all grades and conditions density to be determined density to be determinedSuffix Y: Sulfur Content, max, % by wei
41、ght all grades and conditions 0.60 0.60 Appendix X1D657607314.5 The repeatability standard deviation has been deter-mined to be 0.0029 %. The reproducibility of this test methodis being determined and will be available on or beforeDecember 2009.Recovery, %1 88.802 89.703 89.504 89.605 89.406 89.307
42、89.808 89.709 89.7010 89.60Average 89.51 %Standard Deviation 0.00292309 %15. Flame Resistance15.1 Test in accordance with Test Method D 635 with thefollowing exceptions:15.2 Test three specimens and record average propagationtime.15.3 Specimen Size: 7.0 6 1 mm (0.275 6 0.04 in.) thickby 12.7 6 1 mm
43、(0.5 6 0.04 in.) wide by 125 6 5 mm (4.926 0.2 in.) in length.15.4 Clamp the specimen on one end with its longitudinalaxis horizontal.15.5 The blue flame shall be 38 mm (1.49 in.) in height.15.6 Apply the flame for 60 6 1s.15.7 Remove the flame after 60 6 1 s and record theaverage propagation time i
44、n seconds.16. Shrinkage16.1 ScopeThis test method covers the evaluation ofshrinkage of flexible cellular elastomeric materials.16.2 Significance and UseThis test method provides arelatively simple and short-term evaluation of in-use perfor-mance with regard to shrinkage.16.3 ApparatusAir-circulating
45、 oven equipped with a con-trol to maintain a temperature of 70 6 1C (158 6 2F) duringthe test and having an expanded metal shelf, and a steel rule,graduated in millimetres (inches), capable of measuring toincrements of 1.0 mm (0.05 in.).16.4 Test SpecimenUse three specimens approximately300 by 75 mm
46、 (12 by 3 in.) cut from each of the test samples.16.5 ProcedureAt each of two points, approximately 250mm (10 in.) apart on the centerline of each specimen, place abenchmark. Condition the specimen 24 h at a temperature of 236 2C (73 6 3.6F) and measure the distance between thebenchmarks to the near
47、est 1.0 mm (0.05 in.). Place thespecimens on an expanded metal shelf in an oven operating ata temperature of 70 6 1C (158 6 2F). After 7 days 6 2hours, remove the specimens from the oven, condition for atleast2hat236 2C, and remeasure.16.6 CalculationCalculate percent shrinkage as follows:change in
48、length, % 5L1L2L13 100 (2)where:L1= original length, andL2= length after oven-aging.16.7 ReportReport the shrinkage as the change in lengthbetween the two benchmarks expressed as a percentage of thelength originally measured.TABLE 3 Dimensions and Tolerances of Cellular Rubber Products for General A
49、pplicationsSponge RubberFormThickness Dimension,mm (in.)Thickness Tolerance,mm (in.)Length and Width Dimension,mm (in.)Length and WidthTolerance,mm (in.)Sheet and strip 3.2 (0.125) and under 0.4 (0.016) 152 (6) and under 1.6 (0.063)over 3.2 (0.125) to 12.7 (0.50), incl 0.8 (0.032) over 152 (6) to 457 (18), incl 3.2 (0.125)over 12.7 (0.50) 1.2 (0.047) over 457 (18) 0.5 %Molded or special shapes 6.4 (0.250) and under 0.8 (0.032) 6.4 (0.250) and under 0.8 (0.032)over 6.4 (0.250) to 76.2 (3), incl 1.6 (0.063) over 6.4 (
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