1、Designation: F868 17Standard Classification forLaminated Composite Gasket Materials1This standard is issued under the fixed designation F868; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in pa
2、rentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This classification covers a means for specifying ordescribing pertinent properties of commercial laminate com-posite gasket materials (LCGM). Thes
3、e structures are com-posed of two or more chemically different layers of material.These materials may be organic or inorganic, or combinationswith various binders or impregnants. Gasket coatings are notcovered since details thereof are intended to be given onengineering drawings, or as separate spec
4、ifications. Commer-cial materials designated as enveloped gaskets are excludedfrom this classification; they are covered in Practice F336. Thisclassification system does not cover multilayer steel (MLS)gaskets currently used for some automotive exhaust and headgaskets. MLS gaskets are classified und
5、er Classification F2325.1.2 Since all of the properties that contribute to gasketperformance are not included, use of this classification as abasis for selecting LCGM is limited.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationon
6、ly.1.4 This standard does not purport to 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.1.5 This int
7、ernational standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT)
8、 Committee.2. Referenced Documents2.1 ASTM Standards:2A109/A109M Specification for Steel, Strip, Carbon (0.25Maximum Percent), Cold-RolledD2000 Classification System for Rubber Products in Auto-motive ApplicationsF104 Classification System for Nonmetallic Gasket Materi-alsF146 Test Methods for Fluid
9、 Resistance of Gasket MaterialsF336 Practice for Design and Construction of NonmetallicEnveloped Gaskets for Corrosive ServiceF433 Practice for Evaluating Thermal Conductivity of Gas-ket MaterialsF1276 Test Method for Creep Relaxation of LaminatedComposite Gasket MaterialsF2325 Classification for Mu
10、lti-Layer Steel (MLS) and OtherMetal Layer Gaskets for Transportation Applications3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 boardthe term board is used in the context of a thick(generally greater than 1.52 mm (0.060 in.) and rigid nonme-tallic material often purchased in
11、 sheet or strip form.3.1.2 composite gasket materiala gasket structure com-posed of two or more different materials joined together in flat,parallel layers.4. Significance and Use4.1 This classification is intended to encourage uniformityin reporting properties; to provide a common language forcommu
12、nications between producers and users; to guide engi-neers and designers in the use, construction, and properties ofcommercially available materials; and to be versatile enough tocover new materials and test methods as they are introduced.5. Basis of Classification5.1 This classification is based on
13、 the principle that LCGMshould be described, insofar as possible, in terms of use,composition, combining method, and specific physical andmechanical characteristics. Thus, users of gasket materials can,by selecting different combinations of materials and properties,define various parts. Suppliers, l
14、ikewise, can report uses,composition, and properties of available products.1This classification is under the jurisdiction of ASTM Committee F03 onGaskets and is the direct responsibility of Subcommittee F03.30 on Classification.Current edition approved May 1, 2017. Published May 2017. Originallyappr
15、oved in 1984. Last previous edition approved in 2009 as F868 02 (2009).DOI: 10.1520/F0868-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document
16、Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Princi
17、ples for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.16. Numbering System6.1 To permit line call-out of the description mentioned in5.1, this classification establishes letter or number symbo
18、ls todescribe use, composition, and physical properties and perfor-mance levels of certain properties.6.2 In specifying or describing gasket materials, each linecall-out shall include the number of this system and a numberand letter series describing the use, composition, and combin-ing method plus
19、suffix call-out, as shown in Table 1.6.3 To further specify or describe gasket materials, each linecall-out may include one or more suffix letter-numeralsymbols, as listed in Table 2.7. Physical and Mechanical Properties7.1 Gasket materials identified by this classification shallhave a number and le
20、tter call-out for end-use and constructionindicated in Table 1 and additional properties by a letter-numeral call-out shown in Table 2.8. Thickness Requirements8.1 Gasket materials identified by this classification shallconform to the thickness specified on the gasket drawing or onthe order.8.2 The
21、thickness of individual components of the compos-ite may be specified on the drawing, where necessary, andwhere components can be measured.9. Sampling9.1 Specimens shall be selected from finished gaskets orsheets of suitable size, whichever is the more practicable. Iffinished gaskets are used, the d
22、imensions of sample and anyvariations from method must be reported.9.2 Sufficient specimens shall be selected to provide aminimum of three determinations for each test specified. Theaverage of the determinations shall be considered as the result.10. Conditioning10.1 Prior to all tests, specimens sha
23、ll be conditioned asfollows:10.1.1 When all Classification F104 layers of the compositeare of the same “type,” condition per that type.10.1.2 When the layers of the composite are of differentClassification F104 “types,” the composite shall be conditioned22 h in a controlled humidity room, or in a cl
24、osed chambercontaining air at 21 to 30C (70 to 86F) and 50 to 55 %relative humidity.10.1.3 Other conditioning may be used as agreed uponbetween producer and user.11. Test Methods11.1 The test methods are indicated in Table 2 under eachsuffix symbol when appropriate. Results must be reported asspecif
25、ied in each test method used.12. Keywords12.1 classification; composite; gasket materials; laminatedF868 172TABLE 2 Supplementary Physical and Mechanical CharacteristicsSuffix Symbol Supplementary CharacteristicsA9 Sealability characteristics determined as agreed upon between supplier and user.C9 Co
26、mpressibility characteristics as agreed upon between producer and user.D9 Release characteristics determined as agreed upon between supplier and user.E00 through E99 Weight and thickness change after immersion in ASTM Fuel B shall be determined in accordance with Test MethodsF146.Weight increase sha
27、ll not exceed the standard rating number indicated by the first numeral of the two-digit numberof the E-/symbol.Thickness increase shall not exceed the standard rating indicated by the second numeral of the E-/symbol.Percent Weight Increase(first numeral)Percent Thickness Increase(second numeral)E0_
28、 = not specified E_0 = not specifiedE1_ = 10 E_1 = 05E2_ = 15 E_2 = 010E3_ = 20 E_3 = 015E4_ = 30 E_4 = 520E5_ = 40 E_5 = 1025E6_ = 50 E_6 = 1535E7_ = 60 E_7 = 2545E8_ = 100 E_8 = 3060E9_ = as specified E_9 = as specifiedG00 through G99 Weight and thickness change after immersion in ASTM #3 Oil shal
29、l be determined in accordance with TestMethods F146.Weight increase shall not exceed the standard rating number indicated by first numeral of the two-digit numberof the G-/symbol. Thickness increase shall not exceed the standard rating number indicated by the second nu-meral of the G-/symbol.Percent
30、 Weight Increase(first numeral)Percent Thickness Increase(second numeral)G0_ = not specified G_0 = not specifiedG1_ = 10, max G_1 = 015G2_ = 15, max G_2 = 520G3_ = 20, max G_3 = 1025G4_ = 30, max G_4 = 1530G5_ = 40, max G_5 = 2040G6_ = 60, max G_6 = 3050G7_ = 80, max G_7 = 4060G8_ = 100, max G_8 = 5
31、070G9_ = as specified G_9 = as specifiedH1 through H9 Creep relaxation characteristics shall be determined in accordance with Test Method F1276. Loss of stress atthe end of the test shall not exceed the amount indicated by the numeral of the H-/symbol.H1=10% H5=30%H2=15% H6=40%H3=20% H7=50%H4 = 25 %
32、 H9 = as specifiedK0 through K9 Thermal conductivity characteristics shall be determined in accordance with Practice F433. The K-factor ob-tained in W/mK (Btuin./hft2F), shall fall within the ranges indicated by the numeral of a K-/symbol.K1=0.to0.09(0to0.65)K2 = 0.07 to 0.17 (0.50 to 1.15)K3 = 0.14
33、 to 0.24 (1.00 to 1.65)K4 = 0.22 to 0.31 (1.50 to 2.15)K5 = 0.29 to 0.38 (2.00 to 2.65)K6 = 0.36 to 0.45 (2.50 to 3.15)K7 = 0.43 to 0.53 (3.00 to 3.65)K8 = 0.50 to 0.60 (3.50 to 4.15)K9 = as specifiedAL9 Laminated bond characteristics as agreed upon between producer and user.X9 Crush-extrusion resis
34、tance characteristics as agreed upon between producer and user.Y9 Coating(s) per drawing details.Z0 through Z9 Any other properties per drawing details.AOn engineering drawings or other supplements to this classification.F868 173ASTM International takes no position respecting the validity of any pat
35、ent 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 of such rights, are entirely their own responsibility.This standard is subject to revision
36、 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 for additional standardsand should be addressed to ASTM International Headquarters. Your comm
37、ents 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 to the ASTM Committee on Standards, at the address shown below.This standard is copyrighte
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