1、Designation: D1675 03 (Reapproved 2011)D1675 18Standard Test Methods forPolytetrafluoroethylene Tubing1This standard is issued under the fixed designation D1675; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope Scope*1.1 These test methods cover procedure
3、s for testing polytetrafluoroethylene tubing for use as electrical insulation. Theprocedures appear in the following sections:Procedure SectionsASTMMethodsConditioning 7 .Dielectric Breakdown Voltage 28 30 D149, D876Inside Diameter 8 13 D876Mandrel Bend Test 46 52 D149, D876Melting Point 41 45 D3418
4、, D4895Penetration Test 26 and 27 D876Specific Gravity 36 40 D792, D1505Strain Relief 31 35 .Volatile Loss 20 25 .Wall Thickness 14 19 .NOTE 1These test methods are similar but not identical to those in IEC 606842.1.2 The values stated in inch-pound units are the standard except for temperature, whi
5、ch is stated in degrees Celsius. Values 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 safety, health, and healthenv
6、ironmental practices and determine theapplicability of regulatory limitations prior to use. For specific warning statements, see Section 5.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principle
7、s for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insu
8、lating Materials atCommercial Power FrequenciesD792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by DisplacementD876 Test Methods for Nonrigid Vinyl Chloride Polymer Tubing Used for Electrical InsulationD1505 Test Method for Density of Plastics by the Density-Gradient
9、 TechniqueD1711 Terminology Relating to Electrical InsulationD3418 Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by DifferentialScanning CalorimetryD3487 Specification for Mineral Insulating Oil Used in Electrical ApparatusD4895 Specification for Po
10、lytetrafluoroethylene (PTFE) Resin Produced From DispersionE176 Terminology of Fire Standards1 These test methods are under the jurisdiction ofASTM Committee D09 on Electrical and Electronic Insulating Materials and are the direct responsibility of SubcommitteeD09.07 on Flexible and Rigid Electrical
11、 Insulating Materials.Current edition approved Aug. 1, 2011May 1, 2018. Published August 2011May 2018. Originally approved in 1959. Last previous edition approved in 20032011 asD1675 03.D1675 03 (2011). DOI: 10.1520/D1675-03R11.10.1520/D1675-18.2 For referencedASTM standards, visit theASTM website,
12、www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of
13、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 standard as published by ASTM is to be considered
14、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 States12.2 IEC Standards606842 Flexible Insulating SleevesPart 2: Methods of Test33. Terminology3.1 Defini
15、tions:3.1.1 For definitions pertaining to electrical insulation, refer to Terminology D1711.3.1.2 For definitions pertaining to fire standards, refer to Terminology E176.3.2 Definitions of Terms Specific to This Standard:3.2.1 apparent melting point, nthe temperature at which the appearance of the p
16、lastic changes from opaque to transparent.3.2.2 strain relief, na dimensional change brought about by subjecting the tubing to an elevated temperature.3.2.3 volatile loss, nthe reduction in weight by vaporization under controlled conditions.4. Significance and Use4.1 The test methods in this standar
17、d are considered important to characterize polytetrafluoroethylene tubing. They are intendedprimarily for, but not limited to polytetrafluoroethylene tubing.4.2 Variations in these methods or alternate contemporary methods of measurement may be used to determine the values forthe properties in this
18、standard provided such methods ensure quality levels and measurement accuracy equal to or better than thoseprescribed herein. It is the responsibility of the organizations using alternate test methods to be able to demonstrate this condition.In cases of dispute, the methods specified herein shall be
19、 used.NOTE 2Provision for alternate methods is necessary because of (1) the desire to simplify procedures for specific applications, and (2) the desire toeliminate redundant testing and use data generated during manufacturing process control, including that generated under Statistical Process Contro
20、l (SPC)conditions, using equipment and methods other than those specified herein. An example would be the use of laser micrometers or optical comparatorsto measure dimensions.5. Hazards5.1 Lethal voltages may be present during this test. It is essential that the test apparatus, and all associated eq
21、uipment that maybe electrically connected to it, be properly designed and installed for safe operation. Solidly ground all electrically conductiveparts that any person might come in contact with during the test. Provide means for use at the completion of any test to groundany parts which: were at hi
22、gh voltage during the test; may have acquired an induced charge during the test; may retain a chargeeven after disconnection of the voltage source. Thoroughly instruct all operators in the proper way to conduct tests safely. Whenmaking high voltage tests, particularly in compressed gas or in oil, th
23、e energy released at breakdown may be suffcient to resultin fire, explosion, or rupture of the test chamber. Design test equipment, test chambers, and test specimens so as to minimize thepossibility of such occurrences and to eliminate the possibility of personal injury. See Section 28.5.2 Toxic Che
24、micals from Thermal Decomposition:5.2.1 Polytetrafluoroethylene at temperatures above 200C may produce sufficient toxic vapors to be hazardous in a confinedarea. Sufficient ventilation must be provided in all tests where the material is subjected to testing above 200C. (See Sections 7,23, 26, 33, an
25、d 43.)6. Selection of Test Specimens6.1 In the case of material on spools or in coils, remove and discard at least two turns of the product before selecting materialfor samples from which to prepare test specimens.6.2 In the case of material offered in cut lengths, do not prepare specimens from samp
26、les of material closer than 1 in. (25 mm)from each end.6.3 Do not use specimens with obvious defects unless the purpose of the test is to determine the effects of these defects.7. Conditioning7.1 (WarningSee 5.2.)7.2 Unless otherwise specified, condition and test specimens at least 3 h 3 h at 23 6 2
27、C (73.4 6 4F) 5C and 50 6 5 %10 %relative humidity.INSIDE DIAMETER8. Significance and Use8.1 The inside diameter is of importance in determining the proper physical fit of the tubing.3 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/w
28、ww.ansi.org.D1675 1829. Apparatus9.1 Gage RodsUse standard gage steel rods with smooth surfaces and hemispherical ends having diameters within 60.0002in. (60.005 mm) of the values listed as maxima and minima in Table 1.Aset of two gages (“go” and “no go”) is required for eachsize of tubing.NOTE 3Tap
29、ered steel gages as described in Test Methods D876 may be used as an alternate. These gages are not practical, however, for tubing smallerthan Size No. 20.10. Test Specimens10.1 Cut five specimens of any convenient length, but not less than 3 in. (75 mm) long, from the sample. Do not test kinkedspec
30、imens.11. Procedure11.1 Insert the minimum gage rod for the size tubing under test into the specimen for a distance of at least 1 in. (25 mm) ifpossible, noting whether the rod is easily inserted and withdrawn without appreciable force. If the rod cannot be readily insertedand removed, consider the
31、specimen as having an inside diameter less than the minimum.11.2 Select a gage rod having the maximum size for the tubing under test. Attempt to insert the gage rod into the tubing. If therod can be easily inserted to a distance of 1 in., the tubing has an inside diameter that exceeds the specified
32、maximum. If the rodcannot be readily inserted, the tubing has an inside diameter less than the maximum specified.12. Report12.1 Report the following information:12.1.1 Nominal size or size number of the tubing, andTABLE 1 Sizes of Polytetrafluoroethylene TubingSize Inside Diameter, in. (mm)Maximum M
33、inimum Nominal1 in. 1.060 (26.98) 1.000 (25.40) .1 in. 1.060 (26.98) 1.000 (25.40) . . .78 in. 0.927 (23.55) 0.875 (22.23) .78 in. 0.927 (23.55) 0.875 (22.23) . . .34 in. 0.795 (20.19) 0.750 (19.05) .34 in. 0.795 (20.19) 0.750 (19.05) . . .58 in. 0.662 (16.81) 0.625 (15.88) .58 in. 0.662 (16.81) 0.6
34、25 (15.88) . . .12 in. 0.530 (13.46) 0.500 (12.70) .12 in. 0.530 (13.46) 0.500 (12.70) . . .716 in. 0.464 (11.79) 0.438 (11.38) .716 in. 0.464 (11.79) 0.438 (11.38) . . .38 in. 0.399 (10.13) 0.375 (9.53) .38 in. 0.399 (10.13) 0.375 (9.53) . . .No. 0 0.347 (8.81) 0.325 (8.25) 0.330 (8.38)No. 1 0.311
35、(7.90) 0.289 (7.34) 0.294 (7.47)No. 2 0.278 (7.06) 0.258 (6.55) 0.263 (6.68)No. 3 0.249 (6.32) 0.229 (5.82) 0.234 (5.94)No. 4 0.224 (5.69) 0.204 (5.18) 0.208 (5.28)No. 5 0.198 (5.03) 0.182 (4.62) 0.186 (4.72)No. 6 0.178 (4.52) 0.162 (4.11) 0.166 (4.22)No. 7 0.158 (4.01) 0.144 (3.66) 0.148 (3.76)No.
36、8 0.141 (3.58) 0.129 (3.28) 0.133 (3.38)No. 9 0.124 (3.15) 0.114 (2.90) 0.118 (3.00)No. 10 0.112 (2.84) 0.102 (2.78) 0.106 (2.69)No. 11 0.101 (2.57) 0.091 (2.31) 0.095 (2.41)No. 12 0.091 (2.31) 0.081 (2.06) 0.085 (2.16)No. 13 0.082 (2.08) 0.072 (1.83) 0.075 (1.91)No. 14 0.074 (1.88) 0.064 (1.63) 0.0
37、66 (1.68)No. 15 0.067 (1.70) 0.057 (1.45) 0.059 (1.50)No. 16 0.061 (1.55) 0.051 (1.30) 0.053 (1.35)No. 17 0.054 (1.37) 0.045 (1.14) 0.047 (1.19)No. 18 0.049 (1.24) 0.040 (1.02) 0.042 (1.07)No. 19 0.044 (1.12) 0.036 (0.91) 0.038 (0.97)No. 20 0.040 (1.02) 0.032 (0.81) 0.034 (0.86)No. 22 0.032 (0.81) 0
38、.026 (0.66) 0.028 (0.71)No. 24 0.027 (0.69) 0.020 (0.51) 0.022 (0.56)No. 26 0.022 (0.56) 0.016 (0.41) 0.018 (0.46)No. 28 0.019 (0.48) 0.013 (0.33) 0.015 (0.38)No. 30 0.015 (0.38) 0.010 (0.25) 0.012 (0.30)D1675 18312.1.2 Size or size number as determined.13. Precision and Bias13.1 This test method ha
39、s been in use for many years, but no information has been presented toASTM International upon whichto base a statement of precision. No activity has been planned to develop such information. This test method has no bias becausethe value for inside diameter is determined solely in terms of this test
40、method.WALL THICKNESS14. Significance and Use14.1 The wall thickness provides design data. It is also useful in computing certain physical and electrical properties of thetubing.15. Apparatus15.1 Dial MicrometerFor Size No. 22 and larger, use a dial micrometer4 equipped with a rod support for the sp
41、ecimen anda chisel-edge plunger. Use a gage with a minimum graduation of 0.0005 in. (0.01 mm) and a gaging load not exceeding 25 g. Usea rod made of hardened steel 0.020 in. (0.50 mm) in diameter and 38 in. (9.5 mm) long. Ensure that the chisel edge of the plungeris flat and approximately 0.043 in.
42、(1.1 mm) across and 516 in. (8 mm) long.15.2 MicroscopeFor Size No. 24 and smaller, use an optical means such as a toolmakers microscope.16. Test Specimens16.1 Cut five 12-in. (13-mm) specimens free from kinks from the sample. Make the cut edge perpendicular to the longitudinalaxis of the sample.17.
43、 Procedure17.1 For Size No. 22 and larger, measure the wall thickness of the specimen using the rod and chisel apparatus by raising thechisel from the rod and placing the specimen on the rod in such a manner that the rod passes through the center of the tubingspecimen and rests flatly against the up
44、per inside wall of the specimen. Gently lower the flat chisel edge until it rests lightly onthe upper outside wall of the specimen. Rotate the tubing and determine the minimum and maximum wall thickness. The averageof these two readings is the wall thickness of the specimen.17.2 For Size No. 24 and
45、smaller, use a reference method employing optical means acceptable to both the manufacturer and thepurchaser to determine the maximum and minimum wall thickness.18. Report18.1 Report the following information:18.1.1 Nominal size or number of the tubing, and18.1.2 Minimum, maximum, and average wall t
46、hickness.19. Precision and Bias19.1 This test method has been in use for many years, but no information has been presented toASTM International upon whichto base a statement of precision. No activity has been planned to develop such information. This test method has no bias becausethe value for wall
47、 thickness is determined solely in terms of this test method.VOLATILE LOSS20. Significance and Use20.1 Volatile loss is indicative of the efficiency of removal of volatiles during processing, and may indicate the presence ofundesirable organic materials.21. Apparatus21.1 Analytical Balance, capable
48、of weighing to the nearest 0.001 g.21.2 Oven, forced-convection type, capable of maintaining the temperature set point to the tolerances shown in the procedure.21.3 Desiccator.4 Adial-type micrometer, Gage Model 57B-3, manufactured by Federal Products Corp., 1144 Eddy St., Providence, RI 02901, has
49、been found satisfactory for this purpose.D1675 18422. Test Specimens22.1 Cut three specimens in full section from the sample in a manner such that each specimen is at least 10 in. (250 mm) longand weighs at least 2 g.23. Procedure23.1 (WarningSee 5.2.)23.2 Dry three specimens in an oven at 105 6 2.5C (220 6 4.5F) for 1 h, cool in a desiccator, and weigh immediately uponremoval. Then, place the specimens on a horizontal support in an oven without touching each other or the sides of the oven, makingcertain to keep the spec
