ASTM F1087-2002(2016) Standard Test Method for Linear Dimensional Stability of a Gasket Material to Moisture《衬垫受潮后的线性尺寸稳定性的标准试验方法》.pdf

1、Designation: F1087 02 (Reapproved 2016)Standard Test Method forLinear Dimensional Stability of a Gasket Material toMoisture1This standard is issued under the fixed designation F1087; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,

2、the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a procedure to determine thestability of a gasket material to linear dimensional c

3、hange dueto hygroscopic expansion and contraction. It subjects a sampleto extremes, that is, oven drying and complete immersion inwater, that have shown good correlation to low and highrelative humidities.21.2 The values stated in SI units are to be regarded as thestandard. The values given in paren

4、theses are for informationonly.1.3 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 limitatio

5、ns prior to use.2. Summary of Test Method2.1 A series of samples are preconditioned to a stablestarting point, measured, and then conditioned to a secondexposure condition, either wet or dry. These changes are thendetermined and recorded, and the results presented as percentchange.3. Significance an

6、d Use3.1 Gasket materials undergo several processing steps frompoint of manufacture to installation in a flange. Many applica-tions require close control of dimensional change. An accuratetest method for determining the relative stability of variousmaterials is needed for design and quality assuranc

7、e purposes.This test method is useful towards that end. It simulates theextreme storage conditions that a material may undergo prior toinstallation. Samples are allowed unrestricted expansion orcontraction, and so this test method should not be used topredict behavior clamped in a flange or other ap

8、plications, orduring specific processing steps.3.2 This test method measures linear change, and may needto be modified if the test specimen is not flat, homogeneous, orfree of voids.4. Apparatus4.1 This test method allows individual laboratories to selectmeasuring devices of their own choice, but re

9、quires that thedevice be able to measure with a precision of 60.025 mm(0.001 in.).5. Sampling5.1 At least six test specimens should be taken for eachsample material, three for the high humidity and three for thelow humidity tests. The samples should be cut 2.54 cm (1.00in.) wide, and between 20 and

10、30 cm (8 and 12 in.) in length.The long direction should be in the direction that experiencesthe greatest dimensional change, generally the cross machineor against the grain direction. If there is doubt, both directionsshould be sampled, and the results of the direction with thegreatest change repor

11、ted.6. Conditioning6.1 Test specimens should be preconditioned at least 20 h ina controlled environment maintained between 21 to 30C (70to 85F) and 50 to 55 % relative humidity.7. Procedure7.1 Measure test specimens to 60.025 mm (60.001 in.) andrecord values as initial readings. If the test specimen

12、 is markedfor identification or measurement, be certain that the mark iseasily visible and will withstand exposure to heat and immer-sion in water.7.2 Testing for Dimensional Stability to Low HumidityExpose three prepared specimens in a forced hot-air oven set at100 6 2C (212 6 4F) for 5 h. Remove s

13、pecimens and allowto cool between 21 to 30C (70 to 85F) in a desiccatorcontaining anhydrous-calcium chloride or suitable desiccantmaterial. Remeasure and record measurements as final read-ings.1This test method is under the jurisdiction of ASTM Committee F03 on Gasketsand is the direct responsibilit

14、y of Subcommittee F03.20 on Mechanical TestMethods.Current edition approved Oct. 1, 2016. Published October 2016. Originallyapproved in 1988. Last previous edition approved in 2009 as F1087 02 (2009).DOI: 10.1520/F1087-02R16.2Since this test method takes a “worst case” approach, actual dimensionalch

15、ange due to atmospheric conditions would be expected to be less.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17.3 Testing for Dimensional Stability to High HumidityImmerse three prepared specimens into a tray of deionizedwater to a

16、depth of 1.2 cm (0.5 in.) for a 22 h period. Formaterials that are buoyant in water, a supported wire screen orexpanded metal cover should be used with adequate weights tokeep the specimens immersed at the specified depth. Be certainthat the specimens are separated and able to expand in anunrestrict

17、ed fashion. Remove specimens from water and lightlyblot excess water from the surface of the specimens. Remea-sure and record measurements as final readings.8. Calculation of Results8.1 Report the results as percent change to high or lowhumidity calculated from the following equations:8.1.1 High Hum

18、idity:L5Lf2 LiLi3100 (1)8.1.2 Low Humidity:L5Li2 LfLi3100 (2)where:Li= initial length,Lf= final length, andL= change in length, %.8.2 Calculate and report the average of the three individualspecimens. The total change can then be reported as the sum ofthe low humidity and high humidity changes.9. Re

19、port9.1 Report the following information:9.1.1 The complete identification of the sample material,grade, and caliper,9.1.2 Date of test, and initial and final lengths for eachspecimen,9.1.3 Type and precision of instrument used to determinelength, and9.1.4 Average percentage change in length (%) for

20、 lowhumidity, high humidity, and total.10. Precision and Bias310.1 Table 1 and Table 2 present the results from which therepeatability within a laboratory, and the reproducibility be-tween laboratories can be determined.10.2 Since there is no accepted reference material suitablefor determining the b

21、ias for the procedure in this test methodfor measuring the dimensional stability of gasket materials, nostatement on bias is being made.11. Keywords11.1 linear dimensional stability; moisture; thicknessASTM International takes no position respecting the validity of any patent rights asserted in conn

22、ection 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 time by the respons

23、ible 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 will receive careful c

24、onsideration 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, 10

25、0 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 w

26、ebsite(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ precision data were derived from the results of an interlaboratory testprogram on materials A through H. Suppor

27、ting data are available from ASTMInternational Headquarters. Request RR: F03-1011.TABLE 1 Change to Dry ConditionMaterialAverageXjRepeat-ability(Sr)jReproduc-ability(SL)jTest MethodPrecision(SR)jA 0.02 0.010 0.009 0.014B 1.02 0.081 0.235 0.248C 0.45 0.034 0.096 0.244D 0.52 0.043 0.121 0.128E 0.35 0.

28、042 0.124 0.131F 0.11 0.023 0.019 0.030G 0.21 0.058 0.124 0.137H 1.74 0.039 0.130 0.136TABLE 2 Change to Wet ConditionMaterialAverageXjRepeat-ability(Sr)jReproduc-ability(SL)jTest MethodPrecision(SR)jA 0.25 0.027 0.039 0.046B 0.46 0.018 0.077 0.079C 0.76 0.026 0.122 0.124D 2.59 0.039 0.192 0.196E 0.41 0.022 0.020 0.030F 0.24 0.015 0.037 0.040G 1.52 0.195 0.308 0.365H 10.00 0.200 0.613 0.645F1087 02 (2016)2