1、Designation: D 6456 99 (Reapproved 2004)Standard Specification forFinished Parts Made from Polyimide Resin1This standard is issued under the fixed designation D 6456; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 revision. A number 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 is intended to be a means of callingout finished plastic parts ready for industrial or consumer use.1.
3、2 This specification covers finished parts and shapes fromwhich parts are machined, made from a semi-crystallinepolyimide (PI).1.3 This specification is intended to replace MIL-R-46198and Provisional Standard Specification PS 93.NOTE 1There is no similar or equivalent ISO standard.1.4 This specifica
4、tion covers parts made from semi-crystalline polyimide, which is a thermosetting material thatshows no softening or melting by DMA (D 4065) at or below260C 500F.1.5 Since PI is a thermoset resin, no provisions are includedfor recycled products.1.6 The classification system outlined in this specifica
5、tion isintended to be identical to that used by Department of Defensefor over 20 years. No changes are intended at this time.1.7 The values are stated in SI units and are regarded as thestandard in all property and dimensional tables. For referencepurposes, inch-pound units are stated in brackets.1.
6、8 ApplicationParts in this specification are generallyused for applications requiring the following combination ofproperties: low coefficient of friction, and low thermal expan-sion coupled with heat resistance for continuous operation attemperatures up to 260C 500F and for short-term excur-sions up
7、ward to 482C 900F.1.9 The following precautionary caveat pertains only to thetest method portion, Section 12, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish
8、appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2D 638 Test Method for Tensile Properties of PlasticsD 695 Test Method for Compressive Properties of RigidPlasticsD 790 Test Methods for Flexural P
9、roperties of Unreinforcedand Reinforced Plastics and Electrical Insulating MaterialsD 792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD 883 Terminology Relating to PlasticsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 1708 Test Method
10、for Tensile Properties of Plastics byUse of Microtensile SpecimensD 3892 Practice for Packaging/Packing of PlasticsD 4065 Practice for Determining and Reporting DynamicMechanical Properties of PlasticsE 8 Test Methods for Tension Testing of Metallic Materials2.2 ANSI Standard:Z1.4 Standard for Sampl
11、ing Plans and Tables for Inspectionby Attributes3,42.3 Military Standards:MIL-R-461985MIL-STD 12953. Terminology3.1 DefinitionsTerms are defined in accordance with Ter-minologies D 883 and D 1600 unless otherwise indicated.4. Classification4.1 Product shape and size as defined in the applicablepurch
12、ase order.4.2 The type of product shall be categorized by type andclass depending on resin and filler compositions defined asfollows:1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.20 on Plastic Products.Current edit
13、ion approved March 1, 2004. Published June 2004. Originallyapproved in 1999. Last previous edition approved in 1999 as D 6456 - 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informa
14、tion, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.4Replaced MIL-STD-105.5Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Ph
15、iladelphia, PA 19111-50981Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Type I Unfilled base resinType II Resin with graphite fillerClass 1 15 % by weight graphite filler, nominalClass 2 40 % by weight graphite filler, nominalClass
16、3 15 % by weight graphite and 10 % by weight fluorocarbonfillers, nominalType III 15 % by weight molybdenum disulfide filler, nominalNOTE 2Filler contents shown above are approximate. See Table 1 forexact composition.4.3 Polymer compositions shall be specified by use oftype/class designations as des
17、cribed in Table 1.4.4 Manufacturing method and product form shall be speci-fied by use of a suffix letter as described in Table 2.4.5 When applying the suffix letter, the type/class designa-tion shall precede the letter.5. Ordering Information5.1 All shapes covered by this specification shall be ord
18、eredusing the proper callout designation (see Section 4).6. Material6.1 The base material shall consist of semi-crystalline poly-imide resins with a base polymer structure derived frompyromellitic dianhydride and 4,48-diaminodiphenylether.6.2 The base material shall conform to the compositionrequire
19、ments of Table 1. The base material, depending on typeand class, may contain up to 50 wt % pigments, fillers orlubricants, or a combination thereof, and no fibrous reinforce-ment.6.3 Recycle of unworked resin, such as spills, shall bepermitted to the extent that the resultant material meets allprope
20、rty requirements specified herein.6.4 No reground material shall be permitted.6.5 The basic material shall be free of major defects andcontaminants that would be detrimental to fabrication orperformance of a finished part.7. Physical Property Requirements7.1 The physical property values listed withi
21、n this specifi-cations tables are to be considered minimum specificationvalues. Any requirement for specific test data for a givenproduction lot should be specified at the time of order.8. Dimensional Requirements8.1 Size, shape, dimensions, and tolerances are to be deter-mined by agreement between
22、purchaser and buyer.9. Sampling9.1 Sampling shall be statistically adequate to satisfy therequirements of this specification as applicable (see ANSIZ1.4).9.2 For purposes of sampling, an inspection lot for exami-nation and tests shall consist of all material of the same type,class, grade, and nomina
23、l size submitted for inspection at onetime.10. Number of Tests10.1 Routine lot inspection shall be based upon tensilestrength and tensile elongation at 23C and specific gravity asspecified in product Table 3.10.2 When the number of test specimens is not stated in thetest method, a single determinati
24、on may be made. If more thansingle determinations and separate portions of the same sampleare made, the results shall be averaged. The final result shallconform to the requirements prescribed in this specification.11. Test Conditions11.1 Conditioning of SpecimensThe specification valuesand dimension
25、s are based on dry-as-manufactured (0.2 %moisture) or the test specimens are dried to that level at 65.5C150F, 28 to 30 in. Hg vacuum.11.2 Standard TemperatureThe tests shall be conducted atthe standard laboratory temperature of 23 6 2C 73.4 63.6F and 50 6 5 % relative humidity.12. Test Methods12.1
26、Testing shall be in accordance with the test methodsspecified herein.12.1.1 Tensile StrengthTensile strength shall be deter-mined in accordance with Test Method D 638 using TestMethod D 1708 (microtensile specimen), for “M” and “P”product, and Test Methods E 8 (standard tension test specimensfor pow
27、dered metal products) for “D” product. Crossheadspeed shall be 5 mm/min for all product testing.12.1.2 Tensile Elongation at BreakTensile elongationshall be determined in accordance with Test Methods D 638using Test Methods D 1708 for “M” and “P” product and TestMethods E 8 (standard tension test sp
28、ecimens for powderedmetal products) for “D” product.12.1.3 Specific GravitySpecific gravity shall be deter-mined in accordance with Test Method D 792, Method A.12.1.4 Flexural StrengthFlexural strength shall be deter-mined in accordance with Test Method D 790, Method I,Procedure A.12.1.5 Compressive
29、 StrengthCompressive strength shallbe determined in accordance with Test Method D 695.TABLE 1 Polymer Composition and FormType/Class Polymer Composition Processing Release AgentType I Unfilled polyimide polymer 0.5 % by weight of PTFE,AmaxType IIClass 1Filled polyimide polymerContaining 1416 % bywei
30、ght graphite0.5 % by weight of PTFE,AmaxType IIClass 2Filled polyimide polymerContaining 3539 % byweight graphite2.0 % by weight of PTFE,AmaxType IIClass 3Filled polyimide polymerContaining 1214 % byweight graphite and 911 %by weight PTFEAN/AType III Filled polyimide polymercontaining 1416 % byweigh
31、t molybdenum disulfideN/AAPolytetrafluoroethylene compound.TABLE 2 Manufacturing Method and FormSuffix Letter Product FormM Hot isostatically molded billetP Hot unidirectionally pressed slabD Direct-formed (pressed) and sintered partsD 6456 99 (2004)213. Certification13.1 When requested at the time
32、of order, the purchasershall be furnished a certification that the lot is made from therequired plastic and meets the requirements of this specifica-tion.14. Packaging14.1 PackingThe material shall be packed in accordancewith Practice D 3892.14.2 MarkingIn addition to any special marking requiredby
33、the contract or purchase order, shipping containers shall bemarked for DoD orders in accordance with MIL-STD-129.15. Keywords15.1 polyimide parts; polyimide resins; high temperatureplasticsASTM International takes no position respecting the validity of any patent rights asserted in connection with a
34、ny 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 technica
35、l 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 consideration
36、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 Harbor
37、 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.as
38、tm.org).TABLE 3 Mechanical Properties (Minima)AType/Class Tensile Strength, MPa ksi Tensile Elongation, % Specific Gravity,Flexural Strength,MPa ksi,CompressiveStrength, MPa ksi,236 2C 260 6 3C 23 6 2C 260 6 3C 23 6 2C 23 6 2C 23 6 2CIM 76 11 34.5 5.0 4.8 4.0 1.42 103 15 241 35IP 69 10 27.6 4.0 4.5
39、4.0 1.42 83 12 207 30ID 65.6 9.5 34.5 5.0 5.0 4.5 1.33 69 10 186 27II/1M 55.2 8.0 29.7 4.3 3.5 2.5 1.49 83 12 186 27II/1P 44.8 6.5 25.5 3.7 3.0 2.0 1.49 65.5 9.5 172 25II/1D 55.2 8.0 27.6 4.0 3.5 2.5 1.41 76 11 172 25II/2M 44.8 6.5 20.7 3.0 1.3 0.8 1.64 55.2 8.0 110 16II/2P 32.4 4.7 13.8 2.0 1.3 0.8
40、 1.64 51.7 7.5 103 15II/2D 41.5 6.0 24.1 3.5 1.8 1.0 1.55 55.2 8.0 103 15II/3M 37.9 5.5 17.2 2.5 2.0 1.8 1.54 58.6 8.5 110 16II/3P 24.1 3.5 13.8 2.0 2.0 1.5 1.54 37.9 5.5 103 15II/3D 44.8 6.5 20.7 3.0 4.0 3.0 1.43 55.2 8.0 103 15III/M 27.6 4.0 1.1 1.57 55.2 8.0 III/P 20.7 3.0 1.4 1.57 65.5 9.5 AFor
41、parts and specimens direct-formed (pressed and sintered) (Class D) from powder, tensile strength and elongation are measured perpendicular to the pressingdirection. This is the direction for maximum strength so that the strength minima listed may not apply in other directions. Compressive strength i
42、s measured parallel to thepressing direction so that the strength levels listed are true minima.For parts and specimens from Class P material tensile strength, elongation and compressive strength are measured parallel to the direction of compression. This is thedirection of minimum strength so that properties in other directions may be greater.D 6456 99 (2004)3
