1、Designation: F 806 99a (Reapproved 2003)e1Standard Test Method forCompressibility and Recovery of Laminated CompositeGasket Materials1This standard is issued under the fixed designation F 806; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEAdjunct reference was corrected editorially in April 2006.1. Scope1.1 This test method covers determi
3、nation of the short-timecompressibility and recovery at room temperature 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, theinve
4、rse of which is generally referred to as “compression set.”Also, it is 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
5、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.2. Referenced Documents2.1 ASTM Standards:2F 104 Classification S
6、ystem for Nonmetallic Gasket Mate-rials2.2 ASTM Adjuncts:Testing Machine 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 measu
7、res compressibility with a matched pairof opposing upper and lower penetrators 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 anv
8、il. Also, with many composites having rigidinner layers the load on the 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.
9、Apparatus4.1 The testing machine4shall consist of the followingcomponents.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 l
10、aminatedcomposite gasket materials are shown in Table 1.4.1.2 DialAn indicating 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 penet
11、ratoritself and added weights to give the value specified within 61 %. 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
12、, or any other device capable of applying themajor load at a slow uniform 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 b
13、e either circular or rectangularin shape. The minimum size shall be 12.7 mm (0.5 in.) largerthan the penetrator diameter being used, and the maximum size1This test method is under the jurisdiction of ASTM Committee F03 on Gasketsand is the direct responsibility of Subcommittee F03.20 on Mechanical T
14、estMethods.Current edition approved Oct. 1, 2003. Published October 2003. Originallyapproved in 1983. Last previous edition approved in 1999 as F 806 99a.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMS
15、tandards 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 throughASTM.1Copyright ASTM
16、 International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.shall be 38.1 mm (1.5 in.) larger than it. The thickness shall bethat of the laminated composite gasket. Take care that thespecimen is flat, especially around the planned contact point ofthe opposing
17、penetrators.6. Conditioning6.1 When all 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 controlle
18、d-humidity room or in a closed chamber 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 betwee
19、n theproducer and the user.7. Temperature 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 t
20、he absolute value of this penetrator deflection 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 pene
21、trator in its descentso that it remains 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 f
22、or 60 s, and recordthe thickness of the 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 t
23、he same sample and the results aver-aged.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
24、 When desired, the resiliency shall be calculated asfollows:Resiliency,%5 R2M!/M# 3 100TABLE 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
25、 theproducer and user.Proce-dureType of Gasket Mate-rial in the NonmetallicLayersF 104IdentificationAFirst 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 asbestos
26、sheet; asbestos beatersheet; flexible graphiteF11, F12,F51, F521hat1006 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 (
27、0.252) 22.2 (5) 1090 (245) 1112 (250) 34.5 (5000)F cork composition, 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 % re
28、lative hu-midity12.8 (0.504) 22.2 (5) 334 (75) 356 (80) 2.76 (400)G 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 humidi
29、ty6.4 (0.252) 22.2 (5) 1090 (245) 1112 (250) 34.5 (5000)J compressed 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 mill
30、boardF73 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)ARefers to Classification F 104.F 806 99a (2003)e1211. Precision and Bias511.1 This precision data is based on tests of four differentmaterial samples by six laboratories in 2 days. The c
31、ompress-ibility of the samples studied ranged 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 %
32、.11.3 ReproducibilityThe reproducibility has 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 positio
33、n 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 the riskof infringement of such rights, are entirely their own responsibility.
34、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 revision of this standard or for additional standardsand should be addressed to ASTM I
35、nternational 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 shouldmake your views known to the ASTM Committee on Standards, at the address sho
36、wn 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).5Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: F031013.F 806 99a (2003)e13
