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

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1、Designation: F 1087 02Standard 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, the year of last

2、 revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 change dueto hyg

3、roscopic 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 parentheses are for

4、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 limitations prior to use

5、.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 and Use3.1 Gasket

6、 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 assurance purposes.This

7、 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 applications, ord

8、uring 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 requires that the

9、device 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 30 cm (8 and 12

10、 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 reported.6. Conditio

11、ning6.1 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 is markedfor i

12、dentification 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 specimens and al

13、lowto 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.7.3 Testing for Dimensional Stability to High HumidityImmerse three prepared specimens into a tray of deionizedwater to a

14、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 to1This test method is under the jurisdiction of ASTM Committee F03 on Gasketsand is the direct responsibility of Subcommittee F03.

15、20 on Mechanical TestMethods.Current edition approved Mar. 10, 2002. Published April 2002. Originallypublished as F 1087 - 88. Last previous edition F 1087 - 88 (1997).2Since this test method takes a “worst case” approach, actual dimensionalchange due to atmospheric conditions would be expected to b

16、e less.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.keep the specimens immersed at the specified depth. Be certainthat the specimens are separated and able to expand in anunrestricted fashion. Remove specimens from water and light

17、lyblot 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 Low Humidity:LD5L

18、i2 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 information:9.1

19、.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, and total.10. P

20、recision 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 this test methodfor

21、 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 mentionedin this standa

22、rd. 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 must be reviewe

23、d 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 theresponsible

24、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 C700, West Consh

25、ohocken, 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 precision data wer

26、e 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(SR)jA 0.02 0.010

27、 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 10872