1、Designation: D6456 10Standard Specification forFinished Parts Made from Polyimide Resin1This standard is issued under the fixed designation D6456; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification is intended to be a means of callingout finished plastic parts ready for industrial or consumer use.1.2 This specification
3、 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 known ISO equivalent to this standard.1.4 This specification covers parts
4、 made from semi-crystalline polyimide, which is a thermosetting material thatshows no softening or melting by DMA (D4065) 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 specification isintended
5、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 asstandard in all property and dimensional tables. For referencepurposes, inch-pound units are stated in parentheses.1.8 ApplicationPart
6、s 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 upward to 482C (9
7、00F).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 appropriate s
8、afety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2D638 Test Method for Tensile Properties of PlasticsD695 Test Method for Compressive Properties of RigidPlasticsD790 Test Methods for Flexural Properties of Unr
9、einforcedand Reinforced Plastics and Electrical Insulating MaterialsD792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1600 Terminology for Abbreviated Terms Relating toPlasticsD1708 Test Method for Tensile Properti
10、es of Plastics byUse of Microtensile SpecimensD3892 Practice for Packaging/Packing of PlasticsD4065 Practice for Plastics: Dynamic Mechanical Proper-ties: Determination and Report of ProceduresE8 Test Methods for Tension Testing of Metallic Materials2.2 ANSI Standard:Z1.4 Standard for Sampling Plans
11、 and Tables for Inspectionby Attributes3,42.3 Military Standards:5MIL-R-46198 Resin, Polyimide, Hot Pressed or Pressedand SinteredMIL-STD 129 Standard Practice, Military Marking forShipment and Storage1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct re
12、sponsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Aug. 1, 2010. Published September 2010. Originallyapproved in 1999. Last previous edition approved in 2004 as D6456 - 99 (2004).DOI: 10.1520/D6456-10.2For referenced ASTM standards, visit the ASTM website, www.ast
13、m.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, 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
14、-105.5Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-50981*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Un
15、ited States.3. Terminology3.1 DefinitionsTerms are defined in accordance with Ter-minologies D883 and D1600 unless otherwise indicated.4. Classification4.1 Product shape and size as defined in the applicablepurchase order.4.2 The type of product shall be categorized by type andclass depending on res
16、in and filler compositions defined asfollows:Type I Unfilled base resinType II Resin with graphite fillerClass 1 15 % by weight graphite filler, nominalClass 2 40 % by weight graphite filler, nominalClass 3 15 % by weight graphite and 10 % by weight fluorocarbonfillers, nominalType III 15 % by weigh
17、t 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 described in Table 1.4.4 Manufacturing method and product form shall be speci-fied by use of a suf
18、fix 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 orderedusing the proper callout designation (see Section 4).6. Material6.1 The base material shall
19、 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 compositionrequirements of Table 1. The base material, depending on typeand class, contains up to 50 wt % pigment
20、s, 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 allproperty requirements specified herein.6.4 No reground material shall be permitted.6.5 The basic materi
21、al 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 within this specifi-cations tables are to be considered minimum specificationvalues. Any requirement fo
22、r 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 purchaser and buyer.9. Sampling9.1 Sampling shall be statistically adequate to satisfy therequirem
23、ents 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 nominal size submitted for inspection at onetime.10. Number of Tests10.1 Routine lot inspection shall be
24、 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 determination is sufficient. If more thansingle determinations and separate portions of the same sampleare ma
25、de, 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 dimensions are based on dry-as-manufactured (0.2 %moisture) or the test specimens are dried to that level
26、 at 65C(149F), 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 10 % relative humidity.12. Test Methods12.1 Testing shall be in accordance with the test methodsspecified herein.12.1.1 Tensile StrengthT
27、ensile strength shall be deter-mined in accordance with Test Method D638 using TestMethod D1708 (microtensile specimen), for “M” and “P”product, and Test Methods E8 (standard tension test specimensfor powdered metal products) for “D” product. Crossheadspeed shall be 5 mm/min for all product testing.
28、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 % byweight graphite0.5 % by weight of PTFE,AmaxType IIClass 2Filled polyimide polymerContaini
29、ng 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 % byweight molybdenum disulfideN/AAPolytetrafluoroethylene compound.TABLE 2 Manufacturing Metho
30、d and FormSuffix Letter Product FormM Hot isostatically molded billetP Hot unidirectionally pressed slabD Direct-formed (pressed) and sintered partsD6456 10212.1.2 Tensile Elongation at BreakTensile elongationshall be determined in accordance with Test Methods D638using Test Methods D1708 for “M” an
31、d “P” product and TestMethods E8 (standard tension test specimens for powderedmetal products) for “D” product.12.1.3 Specific GravitySpecific gravity shall be deter-mined in accordance with Test Method D792, Method A.12.1.4 Flexural StrengthFlexural strength shall be deter-mined in accordance with T
32、est Method D790, Method I,Procedure A.12.1.5 Compressive StrengthCompressive strength shallbe determined in accordance with Test Method D695.13. Certification13.1 When requested at the time of order, the purchasershall be furnished a certification that the lot is made from therequired plastic and me
33、ets the requirements of this specifica-tion.14. Packaging14.1 PackingThe material shall be packed in accordancewith Practice D3892.14.2 MarkingIn addition to any special marking requiredby the contract or purchase order, shipping containers shall bemarked for DoD orders in accordance with MIL-STD-12
34、9.15. Keywords15.1 polyimide parts; polyimide resins; high temperatureplasticsSUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue (D6456 - 99(2004) that may impact the use of this standard. (August 1, 2010)(1) Permissive language was
35、revised to eliminate the wordmay.(2) Revised Note 1 to update to standard usage for the ISOequivalency statement.(3) Section 11: Expanded allowable relative humidity rangefrom 5 % to 10 %.TABLE 3 Mechanical Properties (Minima)AType/Class Tensile Strength, MPa (ksi) Tensile Elongation, % Specific Gra
36、vity,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 (35)IP 69 (10) 27.6 (4.0) 4.5 4.0 1.42 83 (12) 207 (30)ID 65.6 (9.5) 34.5 (5.0) 5.0 4.5 1.33 69 (10) 186 (27)II/1M 55.2 (8.0) 29.7 (
37、4.3) 3.5 2.5 1.49 83 (12) 186 (27)II/1P 44.8 (6.5) 25.5 (3.7) 3.0 2.0 1.49 65.5 (9.5) 172 (25)II/1D 55.2 (8.0) 27.6 (4.0) 3.5 2.5 1.41 76 (11) 172 (25)II/2M 44.8 (6.5) 20.7 (3.0) 1.3 0.8 1.64 55.2 (8.0) 110 (16)II/2P 32.4 (4.7) 13.8 (2.0) 1.3 0.8 1.64 51.7 (7.5) 103 (15)II/2D 41.5 (6.0) 24.1 (3.5) 1
38、.8 1.0 1.55 55.2 (8.0) 103 (15)II/3M 37.9 (5.5) 17.2 (2.5) 2.0 1.8 1.54 58.6 (8.5) 110 (16)II/3P 24.1 (3.5) 13.8 (2.0) 2.0 1.5 1.54 37.9 (5.5) 103 (15)II/3D 44.8 (6.5) 20.7 (3.0) 4.0 3.0 1.43 55.2 (8.0) 103 (15)III/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 parts and
39、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 do not apply in other directions. Compressive strength is measured
40、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
41、in other directions can be greater.D6456 103ASTM 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
42、 the riskof infringement 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 revisio
43、n of this standard or for 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 sho
44、uldmake your views known 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/).D6456 104
