ASTM D7671-21
(Test Method)Standard Test Method for Corrosiveness to Silver by Automotive Spark–Ignition Engine Fuel–Silver Strip Method
Standard Test Method for Corrosiveness to Silver by Automotive Spark–Ignition Engine Fuel–Silver Strip Method
SIGNIFICANCE AND USE
4.1 Crude petroleum contains sulfur compounds, most of which are removed during refining. However, of the sulfur compounds remaining in the petroleum product, some can have a corroding action on various metals and this corrosivity is not related to the total sulfur content. In addition, fuels can become contaminated by corrosive sulfur compounds during storage and distribution. The corrosive effect can vary according to the chemical types of sulfur compounds present.
4.2 The silver strip corrosion test is designed to assess the relative degree of corrosivity of a petroleum product towards silver and silver alloys.
4.3 Reactive sulfur compounds present in automotive spark-ignition engine fuels under some circumstances can corrode or tarnish silver alloy fuel gauge in-tank sender units (and silver-plated bearings in some 2-stroke cycle engines). To minimize or prevent the failure of silver alloy in-tank sender units by corrosion or tarnish, Specification D4814 requires that fuels shall pass the silver strip corrosion test.
SCOPE
1.1 This test method covers the determination of the corrosiveness to silver by automotive spark-ignition engine fuel, as defined by Specification D4814, or similar specifications in other jurisdictions, having a vapor pressure no greater than 124 kPa (18 psi) at 37.8 °C (100 °F), by one of two procedures. Procedure A involves the use of a pressure vessel, whereas Procedure B involves the use of a vented test tube.
1.2 The result of the test is based on a visual rating that is classified as an integer in the range from 0 to 4 as defined in Table 1.
1.3 Warning—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location.
1.4 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see 6.1 and Section 7.
1.6 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.
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Standards Content (Sample)
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.
Designation: D7671 − 21
Standard Test Method for
Corrosiveness to Silver by Automotive Spark–Ignition
1
Engine Fuel–Silver Strip Method
This standard is issued under the fixed designation D7671; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This test method covers the determination of the corro-
siveness to silver by automotive spark-ignition engine fuel, as
2. Referenced Documents
defined by Specification D4814, or similar specifications in
2
other jurisdictions, having a vapor pressure no greater than 2.1 ASTM Standards:
D130Test Method for Corrosiveness to Copper from Petro-
124kPa(18psi)at37.8°C(100°F),byoneoftwoprocedures.
Procedure A involves the use of a pressure vessel, whereas leum Products by Copper Strip Test
D3241Test Method for Thermal Oxidation Stability of
Procedure B involves the use of a vented test tube.
Aviation Turbine Fuels
1.2 The result of the test is based on a visual rating that is
D4057Practice for Manual Sampling of Petroleum and
classified as an integer in the range from 0 to 4 as defined in
Petroleum Products
Table 1.
D4177Practice for Automatic Sampling of Petroleum and
1.3 Warning—Mercuryhasbeendesignatedbymanyregu-
Petroleum Products
latoryagenciesasahazardoussubstancethatcancauseserious
D4814Specification for Automotive Spark-Ignition Engine
medicalissues.Mercury,oritsvapor,hasbeendemonstratedto
Fuel
be hazardous to health and corrosive to materials. Use caution
E1Specification for ASTM Liquid-in-Glass Thermometers
when handling mercury and mercury-containing products. See
2.2 Energy Institute Standard:
the applicable product Safety Data Sheet (SDS) for additional
IP227Determination of Corrosiveness to Silver ofAviation
information. The potential exists that selling mercury or
3
Turbine Fuels–Silver Strip Method
mercury-containing products, or both, is prohibited by local or
2.3 ASTM Adjuncts:
national law. Users must determine legality of sales in their
4
Color Standard for Tube Deposit Rating
location.
1.4 The values stated in SI units are to be regarded as the
3. Summary of Test Method
standard. The values in parentheses are for information only.
3.1 This test method covers two procedures. Procedure A
1.5 This standard does not purport to address all of the
involves the use of a pressure vessel (to prevent the loss of
safety concerns, if any, associated with its use. It is the
volatile components in the sample), whereas Procedure B
responsibility of the user of this standard to establish appro-
involves the use of a vented test tube. In both procedures, a
priate safety, health, and environmental practices and deter-
freshly polished silver strip is suspended in 30mL of sample
mine the applicability of regulatory limitations prior to use.
whichisheatedto50°C 61°Cforadurationof3h 65min.
For specific warning statements, see 6.1 and Section 7.
At the end of the heating period, the silver strip is removed,
1.6 This international standard was developed in accor-
washed and the color and tarnish level assessed against the
dance with internationally recognized principles on standard-
requirements in Table 1.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
2
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
1
This test method is under the jurisdiction of ASTM Committee D02 on Standards volume information, refer to the standard’s Document Summary page on
Petroleum Products, Liquid Fuels, and Lubricants and are the direct responsibility the ASTM website.
3
of Subcommittee D02.05 on Properties of Fuels, Petroleum Coke and Carbon Withdrawn without replacement in 2001. Copies of IP 227/99 can be obtained
Material. at The Publications Department, Energy Institute, 61 New Cavendish Street,
Current edition approved Nov. 1, 2021. Published December 2021. Originally London, W1G 7AR, United Kingdom.
4
approved in 2010. Last previous edition approved in 2021 as D7671–10 (2021). Available from ASTM International Headquarters. Order Adjunct No.
DOI: 10.1520/D7671-21. ADJD3241. Original adjunct produced in 1986.
*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 19428-2
...
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: D7671 − 10 (Reapproved 2021) D7671 − 21
Standard Test Method for
Corrosiveness to Silver by Automotive Spark–Ignition
1
Engine Fuel–Silver Strip Method
This standard is issued under the fixed designation D7671; 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.
1. Scope Scope*
1.1 This test method covers the determination of the corrosiveness to silver by automotive spark-ignition engine fuel, as defined
by Specification D4814, or similar specifications in other jurisdictions, having a vapor pressure no greater than 124 kPa (18 psi)
at 37.8 °C (100 °F), by one of two procedures. Procedure A involves the use of a pressure vessel, whereas Procedure B involves
the use of a vented test tube.
1.2 The result of the test is based on a visual rating that is classified as an integer in the range from 0 to 4 as defined in Table
1.
1.3 Warning—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical
issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when
handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional
information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national
law. Users must determine legality of sales in their location.
1.4 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.5 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use. For specific warning statements, see 6.1 and Section 7.
1.6 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
2.1 ASTM Standards:
D130 Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip Test
D3241 Test Method for Thermal Oxidation Stability of Aviation Turbine Fuels
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and are the direct responsibility of
Subcommittee D02.05 on Properties of Fuels, Petroleum Coke and Carbon Material.
Current edition approved Jan. 1, 2021Nov. 1, 2021. Published February 2021December 2021. Originally approved in 2010. Last previous edition approved in 20152021
as D7671 – 10 (2015).(2021). DOI: 10.1520/D7671-10R21.10.1520/D7671-21.
2
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
1
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D7671 − 21
TABLE 1 Silver Strip Classifications
NOTE 1—Classifications provided by IP 227 Determination of Corro-
siveness to Silver of Aviation Turbine Fuels–Silver Strip Method.
NOTE 2—Distinctions between Classifications 1 and 2 are made using
The Color Standard for Tube Deposit Rating (referenced in Test Method
D3241) in accordance with 11.1.1.
Classification Designation Description
0 No tarnish Identical to a freshly pol-
ished strip, but may have
some very light loss of lus-
ter
1 Slight tarnish Faint brown or white discol-
oration of strip (see 12.1)
2 Moderate tarnish Peacock colors such as
blue or mauve or medium/
dark straw or brown color-
ation (see 12.1)
3 Slight blackening Spots and patches of black
or gray on surface or uni-
form thin film of black de-
posit
4 Blackening U
...
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