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Standard Test Method for Determination of Corrosiveness to Silver by Automotive Spark-Ignition Engine Fuelâ€”Thin Silver Strip MethodTranslate name
STANDARD published on 1.11.2021
Designation standards: ASTM D7667-21
Publication date standards: 1.11.2021
The number of pages: 8
Approximate weight : 24 g (0.05 lbs)
Country: American technical standard
Category: Technical standards ASTM
automotive gasoline, corrosiveness to silver, silver corrosion, silver strip,, ICS Number Code 75.160.20 (Liquid fuels)
|Significance and Use|
5.1Crude petroleum contains sulfur compounds, most of which are removed during refining. However, of the sulfur compounds remaining in the petroleum product or introduced into the fuel during storage and distribution, some can have a corroding action on various metals and this corrosivity is not necessarily related directly to the total sulfur content. The 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.
5.2Under some circumstances, reactive sulfur compounds present in automotive spark-ignition engine fuels can tarnish or even corrode silver alloy fuel gauge in-tank sender units or silver-plated bearings (in 2-stroke cycle engines). To minimize or prevent the failure of silver alloy in-tank sender units by tarnish or corrosion, Specification requires that fuels shall pass a silver strip corrosion test.
1.1This test method covers the determination of the corrosiveness to silver by automotive spark-ignition engine fuel (for example, gasoline), as defined by Specification or similar specifications in other jurisdictions, having a vapor pressure no greater than 124kPa (18psi) at 37.8C (100F) by one of two procedures.
1.1.1Procedure AInvolves the use of a pressure vessel.
1.1.2Procedure BInvolves the use of a vented test tube.
1.2The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.31.4This 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.
1.5This 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|
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