1、Designation: F806 99a (Reapproved 2009)Standard Test Method forCompressibility and Recovery of Laminated CompositeGasket Materials1This standard is issued under the fixed designation F806; the number immediately following the designation indicates the year of originaladoption or, in the case of revi
2、sion, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers determination of the short-timecompressibility and recovery at room temperat
3、ure of laminatedcomposite gasket materials.1.2 This test method is not intended as a test for compress-ibility under prolonged stress application, that is “creep,” or forrecovery following such prolonged stress application, theinverse of which is generally referred to as “compression set.”Also, it i
4、s only intended for tests at room temperature.1.3 The values stated in SI units are to be regarded as thestandard. The inch-pound units given in parentheses are forinformation only.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresp
5、onsibility 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.2. Referenced Documents2.1 ASTM Standards:2F104 Classification System for Nonmetallic Gasket Mate-rials2.2 ASTM Adjuncts:Testing Machi
6、ne Drawings33. Significance and Use3.1 This test method is designed to compare related lami-nated composite gasket materials under controlled conditionsand their short-time compressibility and recovery at roomtemperature. It measures compressibility with a matched pairof opposing upper and lower pen
7、etrators which provide betterprecision and bias than methods using an upper penetrator anda lower anvil. It is difficult to prepare undistorted test speci-mens from laminated composite gasket materials which willlay flat on an anvil. Also, with many composites having rigidinner layers the load on th
8、e upper penetrator is distributed overthe bottom anvil area resulting in a lower than actual com-pressibility reading. This test method may be used as a routinetest method when agreed upon between the purchaser and theproducer.4. Apparatus4.1 The testing machine4shall consist of the followingcompone
9、nts.4.1.1 PenetratorsA matched pair of opposing steel cylin-ders (within 6 0.025 mm (0.001 in.) specified for the type ofmaterial being tested, with the cylinder ends hardened andground. Penetrator diameters for various types of laminatedcomposite gasket materials are shown in Table 1.4.1.2 DialAn i
10、ndicating dial, or dials, graduated in 0.025mm (0.001 in.) to show the thickness of the specimen duringthe test. Readings shall be estimated to the nearest 0.0025 mm(0.0001 in.).4.1.3 Preload, shall include the weight of the penetratoritself and added weights to give the value specified within 61 %.
11、 A 22.2-N (5-lbf) preload shall be used.4.1.4 Loading DeviceA device for applying a specifiedmajor load to the upper end of the penetrator, which mayconsist of an arrangement of dead weights, a hydraulic cylin-der, an air cylinder, or any other device capable of applying themajor load at a slow unif
12、orm rate and to an accuracy of 6 1%.The major load shall be in addition to the specified preload.Major loads for various types of laminated composite gasketmaterials are shown in Table 1.5. Test Specimen5.1 The test specimen may be either circular or rectangularin shape. The minimum size shall be 12
13、.7 mm (0.5 in.) largerthan the penetrator diameter being used, and the maximum sizeshall be 38.1 mm (1.5 in.) larger than it. The thickness shall be1This test method is under the jurisdiction of ASTM Committee F03 on Gasketsand is the direct responsibility of Subcommittee F03.20 on Mechanical TestMe
14、thods.Current edition approved Oct. 1, 2009. Published March 2010. Originallyapproved in 1983. Last previous edition approved in 2003 as F806 99a (2003)1.DOI: 10.1520/F0806-99AR09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org
15、. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from ASTM International Headquarters. Order Adjunct No.ADJF0806. Original adjunct produced in 1983.4Alist of recommended suppliers, by Subcommittee F03.20, is available t
16、hroughASTM.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.that of the laminated composite gasket. Take care that thespecimen is flat, especially around the planned contact point ofthe opposing penetrators.6. Conditioning6.1 When all
17、 nonmetallic layers of the laminated compositeare the same type, condition in accordance with that type asshown in Table 1.6.2 When the nonmetallic layers of the laminated compositeare of different types, the specimen shall be conditioned for 22h in a controlled-humidity room or in a closed chamber
18、of airat 21 to 30C (70 to 85F) and 50 to 55 % relative humidity. Inall cases where testing is conducted outside the area ofspecified humidity, specimens shall be removed from thechamber one at a time as needed.6.3 Other conditioning may be as agreed upon between theproducer and the user.7. Temperatu
19、re of Test7.1 The test shall be conducted with both the specimen andthe apparatus at a temperature of 21 to 30C (70 to 85F).8. Procedure8.1 Determine the amount of deflection of the penetrator ateach of the loads used in the test with no specimens present.Add the absolute value of this penetrator de
20、flection to thethickness under total load M in 10.1 to obtain a correctedreading. The values are machine constants which may vary fordifferent instrument designs.8.2 Center the test specimen upon the bottom penetrator,and apply the preload, guiding the top penetrator in its descentso that it remains
21、 parallel to the surface of the bottompenetrator. Maintain for a period of 15 s, and record thepreloaded thickness of the specimen. Immediately apply themajor load in a slow uniform manner so that the total load isattained within 10 s. Maintain the total load for 60 s, and recordthe thickness of the
22、 specimen. Immediately remove the majorload, and after a period of 60 s, record the thickness of thespecimen under the original preload. This is the recoveredthickness.9. Number of Tests9.1 A minimum of three tests shall be run on separatespecimens taken from the same sample and the results aver-age
23、d.10. Calculation10.1 Calculate the compressibility, C, and recovery, D,inpercent as follows:C 5 P 2 M!/P 3 100D 5 R 2 M!/P 2 M! 3 100where:P = thickness under preload, mm (in.),M = thickness under total load, mm (in.), andR = recovered thickness, mm (in.).10.2 When desired, the resiliency shall be
24、calculated asfollows:TABLE 1 Conditioning and Test Loads for Laminated Composite Gasket MaterialsNOTEIf the nonmetallic layers of the laminated composite are not all the same material, then the test loads may be as agreed upon between theproducer and user.Proce-dureType of Gasket Mate-rial in the No
25、nmetallicLayersF104IdentificationAFirst TwoNumerals of Six-Digit NumberConditioning ProcedurePenetratorDiameter, mm (in.)Preload,N (lbf)Major Load,N (lbf)Total Load (sum of Major Loadand Preload)N (lbf) MPa (psi)A compressed asbestossheet; asbestos beatersheet; flexible graphiteF11, F12,F51, F521hat
26、1006 2C (212 6 3.6F);cool in desiccator over anhydrouscalcium chloride 21 to 30C (70to 85F)6.4 (0.252) 22.2 (5) 1090 (245) 1112 (250) 34.5 (5000)H asbestos paper andmillboardF13 4 h at 100 6 2C (2126 3.6F);cool as in Procedure A6.4 (0.252) 22.2 (5) 1090 (245) 1112 (250) 34.5 (5000)F cork composition
27、, corkand cellular rubberF21, F23 At least 46 h at 21 to 30C (70 to85F) and 50 to 55 % relative hu-midity28.7 (1.129) 22.2 (5) 423 (95) 445 (100) 0.69 (100)B cork and rubber F22 At least 46 h at 21 to 30C (70 to85F) and 50 to 55 % relative hu-midity12.8 (0.504) 22.2 (5) 334 (75) 356 (80) 2.76 (400)G
28、 treated and untreatedpapers from celluloseor other organic fibersF31, F32, F33,F344 h at 21 to 30C (70 to 85F)over anhydrous calcium chloridefollowed immediately by at least20 h at 21 to 30C (70 to 85F)and 50 to 55 % relative humidity6.4 (0.252) 22.2 (5) 1090 (245) 1112 (250) 34.5 (5000)J compresse
29、d nonasbes-tos sheet; nonasbestosbeater sheetF71, F72 1 h at 1006 2C (212 6 3.6F);cool in desiccator over anhydrouscalcium chloride 21 to 30C (70to 85F)6.4 (0.252) 22.2 (5) 1090 (245) 1112 (250) 34.5 (5000)K nonasbestos paperand millboardF73 4 h at 100 6 2C (2126 3.6F);cool as in Procedure A6.4 (0.2
30、52) 22.2 (5) 1090 (245) 1112 (250) 34.5 (5000)ARefers to Classification F104.F806 99a (2009)2Resiliency,%5 R2M!/M# 3 10011. Precision and Bias511.1 This precision data is based on tests of four differentmaterial samples by six laboratories in 2 days. The compress-ibility of the samples studied range
31、d from 3 to 16 %. Precisionis expressed in absolute terms, in this case, percent compress-ibility points.11.2 RepeatabilityThe repeatability has been estimated tobe 6 0.71 %. Two test results do not differ significantly unlesstheir difference exceeds 1.0 %.11.3 ReproducibilityThe reproducibility has
32、 been esti-mated to be 62.1 %. Two test results do not differ significantlyunless their difference exceeds 2.9 %.12. Keywords12.1 compressibility; gasket material composites; gasketmaterial laminates; recovery; resiliencyASTM International takes no position respecting the validity of any patent righ
33、ts 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 at any
34、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 comments wil
35、l 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 copyrighted by AST
36、M 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/).5Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:F03-1013.F806 99a (2009)3
