ASTM D1675-18

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it 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 version
of the standard as published by ASTM is to be considered the official document.
Designation: D1675 − 03 (Reapproved 2011) D1675 − 18
Standard Test Methods for
Polytetrafluoroethylene Tubing
This standard is issued under the fixed designation D1675; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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 procedures for testing polytetrafluoroethylene tubing for use as electrical insulation. The
procedures appear in the following sections:
ASTM
Procedure Sections Methods
Conditioning 7 .
Dielectric Breakdown Voltage 28 – 30 D149, D876
Inside Diameter 8 – 13 D876
Mandrel Bend Test 46 – 52 D149, D876
Melting Point 41 – 45 D3418, D4895
Penetration Test 26 and 27 D876
Specific Gravity 36 – 40 D792, D1505
Strain Relief 31 – 35 .
Volatile Loss 20 – 25 .
Wall Thickness 14 – 19 .
NOTE 1—These test methods are similar but not identical to those in IEC 60684–2.
1.2 The values stated in inch-pound units are the standard except for temperature, which is stated in degrees Celsius. Values in
parentheses 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 responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability 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 standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at
Commercial Power Frequencies
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D876 Test Methods for Nonrigid Vinyl Chloride Polymer Tubing Used for Electrical Insulation
D1505 Test Method for Density of Plastics by the Density-Gradient Technique
D1711 Terminology Relating to Electrical Insulation
D3418 Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by Differential
Scanning Calorimetry
D3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus
D4895 Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
E176 Terminology of Fire Standards
These test methods are under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and are the direct responsibility of Subcommittee
D09.07 on Flexible and Rigid Electrical Insulating Materials.
Current edition approved Aug. 1, 2011May 1, 2018. Published August 2011May 2018. Originally approved in 1959. Last previous edition approved in 20032011 as
D1675 – 03.D1675 – 03 (2011). DOI: 10.1520/D1675-03R11.10.1520/D1675-18.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D1675 − 18
2.2 IEC Standards
60684–2 Flexible Insulating Sleeves—Part 2: Methods of Test
3. Terminology
3.1 Definitions:
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, n—the temperature at which the appearance of the plastic changes from opaque to transparent.
3.2.2 strain relief, n—a dimensional change brought about by subjecting the tubing to an elevated temperature.
3.2.3 volatile loss, n—the reduction in weight by vaporization under controlled conditions.
4. Significance and Use
4.1 The test methods in this standard are considered important to characterize polytetrafluoroethylene tubing. They are intended
primarily 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 for
the properties in this standard provided such methods ensure quality levels and measurement accuracy equal to or better than those
prescribed 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 used.
NOTE 2—Provision for alternate methods is necessary because of (1) the desire to simplify procedures for specific applications, and (2) the desire to
eliminate redundant testing and use data generated during manufacturing process control, including that generated under Statistical Process Control (SPC)
conditions, using equipment and methods other than those specified herein. An example would be the use of laser micrometers or optical comparators
to measure dimensions.
5. Hazards
5.1 Lethal voltages may be present during this test. It is essential that the test apparatus, and all associated equipment that may
be electrically connected to it, be properly designed and installed for safe operation. Solidly ground all electrically conductive
parts that any person might come in contact with during the test. Provide means for use at the completion of any test to ground
any parts which: were at high voltage during the test; may have acquired an induced charge during the test; may retain a charge
even after disconnection of the voltage source. Thoroughly instruct all operators in the proper way to conduct tests safely. When
making high voltage tests, particularly in compressed gas or in oil, the energy released at breakdown may be suffıcient to result
in fire, explosion, or rupture of the test chamber. Design test equipment, test chambers, and test specimens so as to minimize the
possibility of such occurrences and to eliminate the possibility of personal injury. See Section 28.
5.2 Toxic Chemicals from Thermal Decomposition:
5.2.1 Polytetrafluoroethylene at temperatures above 200°C may produce sufficient toxic vapors to be hazardous in a confined
area. Sufficient ventilation must be provided in all tests where the material is subjected to testing above 200°C. (See Sections 7,
23, 26, 33, and 43.)
6. Selection of Test Specimens
6.1 In the case of material on spools or in coils, remove and discard at least two turns of the product before selecting material
for samples from which to prepare test specimens.
6.2 In the case of material offered in cut lengths, do not prepare specimens from samples 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. Conditioning
7.1 (Warning—See 5.2.)
7.2 Unless otherwise specified, condition and test specimens at least 3 h 3 h at 23 6 2°C (73.4 6 4°F) 5°C and 50 6 5 %10 %
relative humidity.
INSIDE DIAMETER
8. Significance and Use
8.1 The inside diameter is of importance in determining the proper physical fit of the tubing.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
D1675 − 18
9. Apparatus
9.1 Gage Rods—Use standard gage steel rods with smooth surfaces and hemispherical ends having diameters within 60.0002
in. (60.005 mm) of the values listed as maxima and minima in Table 1. A set of two gages (“go” and “no go”) is required for each
size of tubing.
NOTE 3—Tapered steel gages as described in Test Methods D876 may be used as an alternate. These gages are not practical, however, for tubing smaller
than Size No. 20.
10. Test Specimens
10.1 Cut five specimens of any convenient length, but not less than 3 in. (75 mm) long, from the sample. Do not test kinked
specimens.
11. Procedure
11.1 Insert the minimum gage rod for the size tubing under test into the specimen for a distance of at least 1 in. (25 mm) if
possible, noting whether the rod is easily inserted and withdrawn without appreciable force. If the rod cannot be readily inserted
and removed, consider the 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 the
rod can be easily inserted to a distance of 1 in., the tubing has an inside diameter that exceeds the specified maximum. If the rod
cannot be readily inserted, the tubing has an inside diameter less than the maximum specified.
12. Report
12.1 Report the following information:
12.1.1 Nominal size or size number of the tubing, and
TABLE 1 Sizes of Polytetrafluoroethylene Tubing
Inside Diameter, in. (mm)
Size
Maximum Minimum Nominal
1 in. 1.060 (26.98) 1.000 (25.40) .
1 in. 1.060 (26.98) 1.000 (25.40) . . .
⁄8 in. 0.927 (23.55) 0.875 (22.23) .
⁄8 in. 0.927 (23.55) 0.875 (22.23) . . .
⁄4 in. 0.795 (20.19) 0.750 (19.05) .
⁄4 in. 0.795 (20.19) 0.750 (19.05) . . .
⁄8 in. 0.662 (16.81) 0.625 (15.88) .
⁄8 in. 0.662 (16.81) 0.625 (15.88) . . .
⁄2 in. 0.530 (13.46) 0.500 (12.70) .
⁄2 in. 0.530 (13.46) 0.500 (12.70) . . .
⁄16 in. 0.464 (11.79) 0.438 (11.38) .
⁄16 in. 0.464 (11.79) 0.438 (11.38) . . .
⁄8 in. 0.399 (10.13) 0.375 (9.53) .
⁄8 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 (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. 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) 0.066 (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) 0.026 (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 − 18
12.1.2 Size or size number as determined.
13. Precision and Bias
13.1 This test method has been in use for many years, but no information has been presented to ASTM International upon which
to base a statement of precision. No activity has been planned to develop such information. This test method has no bias because
the value for inside diameter is determined solely in terms of this test method.
WALL THICKNESS
14. Significance and Use
14.1 The wall thickness provides design data. It is also useful in computing certain physical and electrical properties of the
tubing.
15. Apparatus
15.1 Dial Micrometer—For Size No. 22 and larger, use a dial micrometer equipped with a rod support for the specimen and
a 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. Use
a rod made of hardened steel 0.020 in. (0.50 mm) in diameter and ⁄8 in. (9.5 mm) long. Ensure that the chisel edge of the plunger
is flat and approximately 0.043 in. (1.1 mm) across and ⁄16 in. (8 mm) long.
15.2 Microscope—For Size No. 24 and smaller, use an optical means such as a toolmaker’s microscope.
16. Test Specimens
16.1 Cut five ⁄2-in. (13-mm) specimens free from kinks from the sample. Make the cut edge perpendicular to the longitudinal
axis of the sample.
17. Procedure
17.1 For Size No. 22 and larger, measure the wall thickness of the specimen using the rod and chisel apparatus by raising the
chisel from the rod and placing the specimen on the rod in such a manner that the rod passes through the center of the tubing
specimen and rests flatly ag
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