ASTM D4872-2014 Standard Test Method for Dielectric Testing of Wire and Cable Filling Compounds《电线和电缆填充物介电性测试的标准试验方法》.pdf

1、Designation: D4872 99 (Reapproved 2010)D4872 14Standard Test Method forDielectric Testing of Wire and Cable Filling Compounds1This standard is issued under the fixed designation D4872; 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. Scope Scope*1.1 This test method covers the determination of dissipation factor, permittivity (dielectric constan

3、t)constant), and ac volumeresistivity of wire and cable filling compounds and related materials that are solid at room temperature, but capable of being meltedat elevated temperature.1.2 Whenever two sets of values are presented, in different units, the values in the first set are the standard, whil

4、e those inparentheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regul

5、atorylimitations prior to use. Specific hazard statements are given in Section 7.2. Referenced Documents2.1 ASTM Standards:2D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance of Insulat

6、ing MaterialsD1321 Test Method for Needle Penetration of Petroleum WaxesD1711 Terminology Relating to Electrical InsulationD6054 Practice for Conditioning Electrical Insulating Materials for Testing (Withdrawn 2012)33. Terminology3.1 DefinitionsFor definitions of terms used in this test method, refe

7、r to Terminology D1711.4. Summary of Test Method4.1 Place a measured volume of melted sample, free of entrapped air, into a level preheated specimen dish.Allow the specimento cool and place primary and secondary electrodes in uniform contact with the specimen surface. Connect test leads to thespecim

8、en dish and the cover plate electrode; make measurements to obtain values from which dissipation factor, permittivity, anddc volume resistivity are calculated.5. Significance and Use5.1 Dissipation factor, permittivity, and dc volume resistivity are properties of communication cable fillers and fill

9、er componentsthat are controlled in order that the cables electrical performance falls within its design limits. Relatively small amounts ofcontaminants, such as polar compounds, water, or salts,salts degrade the cables electrical properties. Limits on the dielectricproperties of the cable filling c

10、ompound are usually specified by the cable manufacturer, by industry standards or both.6. Apparatus6.1 Specimen Dish and Cover Electrode, as shown in Fig. 1. Use a gold- or nickel-plated specimen dish and cover electrodeplate to ensure a corrosion resistant, high conductivity surface.1 This test met

11、hod is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of SubcommitteeD09.18 on Solid Insulations, Non-Metallic Shieldings and Coverings for Electrical and Telecommunication Wires and Cables.Current edition approved Marc

12、h 1, 2010Nov. 1, 2014. Published August 2010November 2014. Originally approved in 1988. Last previous edition approved in 20042010as D487299(2004)D4872 99 (2010). 1. DOI: 10.1520/D4872-99R10.10.1520/D4872-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer

13、 Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.This document is not an ASTM standard and is intended only to provi

14、de the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the s

15、tandard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.1.1 Clean the specimen dish and electrode plate

16、of oxidation by rinsing in a 5 % hydrochloric acid solution for a maximumof 5 s, followed by distilled water, isopropyl alcohol and, finally, by a low boiling petroleum distillate (naphtha) (see Section 7).Alternatively, Alternatively (preferred), use an ultrasonic cleansing bath. Store the dish and

17、 cover, wrapped in paper towels, in adesiccator or in an oven maintained at 50 C. 50C.6.2 Dial Comparator, having a minimum travel of 0.4 in. (10.2 mm) or equivalent.6.3 Leveling Table, adjustable to 6 161 min of arc. The base from a Test Method D1321 penetrometer is satisfactory.6.4 Glass Syringe,

18、10.0-mL capacity.6.5 Oven, capable of maintaining the temperature used to determine viscosity for the particular compound under test.6.6 Q-Meter, or equivalent.6.7 Teraohm Meter, or equivalent.7. Hazards7.1 The chemicals used in cleaning the sample dish are considered hazardous. Exercise care in han

19、dling hydrochloric acid andnaphtha. Naphtha is extremely flammable; do not use in an area near sparks or open flame.8. Sample and Test Specimen8.1 The sample is to be representative of the material to be tested. Approximately 100 g of material is sufficient for severalspecimens.9. Calibration and St

20、andardization9.1 Follow the calibration and standardization procedures found in the operating manuals for the cited measuring equipment.FIG. 1 Electrode Plate and Specimen Dish for Dielectric Testing of Wire and Cable Filling CompoundsD4872 14210. Conditioning10.1 Condition the sample in an atmosphe

21、re of 23 6 3 C 3C and 50 6 5 % relative humidity, in accordance with PracticeD6054.11. Procedure11.1 Heat the sample, specimen dish, and syringe for 1.5 6 0.5 h in an oven set at a temperature previously determined toproduce a homogeneous liquid.11.2 Remove the sample from the oven and stir gently t

22、o ensure uniformity, being careful to avoid entraining air bubbles.11.3 Place the specimen dish on the leveled leveling table. With the hot syringe, transfer 5.0 mL of the sample to the specimendish in a manner that avoids air bubble entrapment (discharge syringe at or below the specimen surface). C

23、ool the specimen andspecimen dish at 1/23/501/23/50, as defined in Practice D6054, except the tolerance for temperature shall be 6 3 C.63C.11.4 Gently center the cover electrode on the solidified specimen. The cover electrode should contact the surface of thespecimen.11.5 Transfer the dish with spec

24、imen to the comparator. Measure the thickness of the dish base plus the specimen plus theelectrodes to the nearest 0.001 in. (0.0024 mm) in 45 increments 0.5 in. (12.7 mm) from the periphery of the electrode plate. Ifthe greatest difference between the largest and smallest readings is 0.003 in. (0.0

25、76 mm) or less, the specimen is satisfactory.Proceed with the electrical measurements. If the difference is greater than 0.003 in., the specimen is excessively wedge-shaped andcannot be used. Prepare a new specimen.11.6 Position the specimen dish (which becomes the base electrode) for the dielectric

26、 tests.11.7 Determine the dissipation factor and permittivity (dielectric constant) at 1 MHz 1 MHz, in accordance with the proceduresfound in the operating manuals for the test equipment being used and the calculations found in Test Methods D150.11.8 Determine the volume resistivity, in accordance w

27、ith the procedures found in the operating manuals for the test equipmentbeing used and the calculations found in Test Methods D257.12. Report12.1 Report the following information:12.1.1 Description of the material tested, that is, the name, grade, color, manufacturer, and other pertinent data,12.1.2

28、 Individual thickness measurements and their averages,12.1.3 Conditioning of the specimen, and test conditions,12.1.4 Method of measurement and measurement circuits,12.1.5 Measured values, and12.1.6 Calculated values of dissipation factor, permittivity, and volume resistivity.13. Precision and Bias1

29、3.1 PrecisionThe precision of this test method has not been determined and no work is planned.13.2 BiasA statement of bias is not possible due to a lack of a standard reference material.14. Keywords14.1 cable; dielectric testing; dissipation factor; filling compounds; permittivity; volume resistivit

30、y; wireSUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this standard since the last issue (D4872 99(2010) that may impact the use of this standard. (Approved Nov. 1, 2014.)(1) Revised subsection 6.1.1.D4872 143ASTM International takes no position respecting the val

31、idity 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.This standard is sub

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33、ters. 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 shown below.This standar

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