1、Designation: F 1087 02 (Reapproved 2009)Standard Test Method forLinear Dimensional Stability of a Gasket Material toMoisture1This standard is issued under the fixed designation F 1087; 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
3、 change 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 par
4、entheses 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 limitat
5、ions 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
6、and 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 assura
7、nce 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
8、applications, 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
9、requires 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 an
10、d 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 rep
11、orted.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 specim
12、en 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
13、 specimens 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 responsibil
14、ity of Subcommittee F03.20 on Mechanical TestMethods.Current edition approved May 1, 2009. Published May 2009. Originallyapproved in 1988. Last previous edition approved in 2002 as F 1087 02.2Since this test method takes a “worst case” approach, actual dimensionalchange due to atmospheric conditions
15、 would be expected to be less.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.3 Testing for Dimensional Stability to High HumidityImmerse three prepared specimens into a tray of deionizedwater to a depth of 1.2 cm (0.5 in.) for a 2
16、2 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 anunrestricted fashion. Remove specimens from
17、 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 Humidity:LD5Lf2 LiLi3 100 (1)8.1.2 L
18、ow Humidity:LD5Li2 LfLi3 100 (2)where:Li= initial length,Lf= final length, andLD= 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. Report9.1 Report the following
19、 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 lowhumidity, high humidity,
20、 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 bias for the procedure in thi
21、s 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 connection with any item mention
22、edin 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 responsible technical committee and
23、 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 consideration at a meeting of
24、 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, 100 Barr Harbor Drive, PO Box
25、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).3The pr
26、ecision data were derived from the results of an interlaboratory testprogram on materials A through H. Supporting data are available from ASTMInternational Headquarters. Request RR: F03-1011.TABLE 1 Change to Dry ConditionMaterialAverageXjRepeat-ability(Sr)jReproduc-ability(SL)jTest MethodPrecision(
27、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 0.042 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 0.645F 1087 02 (2009)2
