ASTM D2472-15

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: D2472 − 00 (Reapproved 2014) D2472 − 15
Standard Specification for
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Sulfur Hexafluoride
This standard is issued under the fixed designation D2472; 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
1.1 This specification applies to sulfur hexafluoride for use as an electrical insulating gas.
NOTE 1—This specification is intended to apply only to gas as purchased. However, the test methods referred to in this standard may be useful in the
evaluation of in-service or used gas. Test Method D2284 may be particularly helpful since many sulfur hexafluoride decomposition products are acidic.
Test Method D2284 should not be used to evaluate the total amount of sulfur hexafluoride decomposition nor to identify contaminant species. This can
only be done by gas chromatography and similar instrumental techniques.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
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2.1 ASTM Standards:
D2029 Test Methods for Water Vapor Content of Electrical Insulating Gases by Measurement of Dew Point
D2284 Test Method for Acidity of Sulfur Hexafluoride
D2685 Test Method for Air and Carbon Tetrafluoride in Sulfur Hexafluoride by Gas Chromatography
3. Detail Requirements
3.1 Sulfur hexafluoride for use as an electrical insulation material shall conform to the requirements prescribed in Table 1.
4. Sampling
4.1 Withdraw a sample of sulfur hexafluoride from either the vapor space or liquid phase of the container.
4.2 For samples collected from the liquid phase the user must ascertain whether or not the cylinder valve is attached to a dip
tube. Sample cylinders equipped with a dip tube in an upright position. Invert cylinders not equipped with a dip tube for sampling
to ensure that the sample is obtained from the liquid phase of the cylinder.
4.3 Analyses may be performed on vapor space samples for routine or preliminary testing. If the vapor phase analysis indicates
that impurities are not within specification, a liquid phase sample should be obtained and analysed. The liquid phase comprises
most of the material in the container and is more representative of the overall composition of the SF in the container. When a
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discrepancy exists between vapor and liquid phase analyses, the liquid phase analysis shall govern, unless otherwise agreed to by
purchaser-seller agreement.
5. Precautions
5.1 Refer to the section titled Interferences in Test Method D2029.
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This specification is under the jurisdiction of ASTM Committee D27 on Elec
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