ASTM D7671-10e1
(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
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.
The silver strip corrosion test is designed to assess the relative degree of corrosivity of a petroleum product towards silver and silver alloys.
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 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.4 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. For specific warning statements, see 6.1 and Section 7.
TABLE 1 Silver Strip Classifications
Note 1—Classifications provided by IP 227 Determination of Corrosiveness 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. ClassificationDesignationDescription 0No tarnishIdentical to a freshly polished strip, but may have some very light loss of luster 1Slight tarnishFaint brown or white discoloration of strip (see 12.1) 2Moderate tarnishPeacock colors such as blue or mauve or medium/dark straw or brown coloration (see 12.1) 3Slight blackeningSpots and patches of black or gray on surface or uniform thin film of black deposit 4BlackeningUniform heavy blackening with or without scaling
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
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Designation: D7671 − 10
StandardTest Method for
Corrosiveness to Silver by Automotive Spark–Ignition
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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.
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ε NOTE—Corrected unit in 9.2.1 editorially in July 2012.
1. Scope D4814Specification for Automotive Spark-Ignition Engine
Fuel
1.1 This test method covers the determination of the corro-
E1Specification for ASTM Liquid-in-Glass Thermometers
siveness to silver by automotive spark-ignition engine fuel, as
2.2 Energy Institute Standard:
defined by Specification D4814, or similar specifications in
IP227Determination of Corrosiveness to Silver ofAviation
other jurisdictions, having a vapor pressure no greater than
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Turbine Fuels–Silver Strip Method
124kPa (18 psi) at 37.8°C (100°F), by one of two procedures.
2.3 ASTM Adjuncts:
Procedure A involves the use of a pressure vessel, whereas
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Color Standard for Tube Deposit Rating
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
3. Summary of Test Method
classified as an integer in the range from 0 to 4 as defined in
3.1 This test method covers two procedures. Procedure A
Table 1.
involves the use of a pressure vessel (to prevent the loss of
1.3 The values stated in SI units are to be regarded as the
volatile components in the sample), whereas Procedure B
standard. The values in parentheses are for information only.
involves the use of a vented test tube. In both procedures, a
1.4 This standard does not purport to address all of the
freshly polished silver strip is suspended in 30 mL of sample
safety concerns, if any, associated with its use. It is the
which is heated to 50 6 1°C for a duration of 3 h 6 5 min.At
responsibility of the user of this standard to establish appro-
the end of the heating period, the silver strip is removed,
priate safety and health practices and determine the applica-
washed and the color and tarnish level assessed against the
bility of regulatory limitations prior to use. For specific
requirements in Table 1.
warning statements, see 6.1 and Section 7.
4. Significance and Use
2. Referenced Documents
4.1 Crude petroleum contains sulfur compounds, most of
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which are removed during refining. However, of the sulfur
2.1 ASTM Standards:
D130Test Method for Corrosiveness to Copper from Petro- compoundsremaininginthepetroleumproduct,somecanhave
a corroding action on various metals and this corrosivity is not
leum Products by Copper Strip Test
D3241Test Method for Thermal Oxidation Stability of relatedtothetotalsulfurcontent.Inaddition,fuelscanbecome
contaminated by corrosive sulfur compounds during storage
Aviation Turbine Fuels
D4057Practice for Manual Sampling of Petroleum and and distribution.The corrosive effect can vary according to the
chemical types of sulfur compounds present.
Petroleum Products
D4177Practice for Automatic Sampling of Petroleum and
4.2 The silver strip corrosion test is designed to assess the
Petroleum Products
relative degree of corrosivity of a petroleum product towards
silver and silver alloys.
4.3 Reactivesulfurcompoundspresentinautomotivespark-
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This test method is under the jurisdiction of ASTM Committee D02 on
ignition engine fuels under some circumstances can corrode or
Petroleum Products, Liquid Fuels, and Lubricants and are the direct responsibility
of Subcommittee D02.05.0C on Color and Reactivity.
Current edition approved Oct. 1, 2010. Published November 2010. DOI:
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10.1520/D7671–10. Withdrawn without replacement in 2001. Copies of IP 227/99 can be obtained
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or at The Publications Department, Energy Institute, 61 New Cavendish Street,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM London, W1G 7AR, United Kingdom.
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Standards volume information, refer to the standard’s Document Summary page on Available from ASTM International Headquarters. Order Adjunct No.
the ASTM website. ADJD3241. Original adjunct produced in 1986.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7671 − 10
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)
...
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