ASTM D6423-18 PDF

Scope: 1.1 This test method covers a procedure to determine a measure of the acid strength of high ethanol content fuels. These include denatured fuel ethanol and ethanol fuel blends. The test method is applicable to denatured fuel ethanol and ethanol fuel blends containing ethanol at 51 % by volume, or more. 1.2 Acid strength as measured in this test method is defined as pHe. A pHe value for alcohol solutions is not comparable to pH values of water solutions. 1.2.1 The value of pHe measured will depend somewhat on the fuel blend, the stirring rate, and the time the electrode is in the fuel. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 Hydrogen ion activity in water is expressed as pH and hydrogen ion activity in ethanol is expressed as pHe. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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.

ASTM D6423-18 Referenced Document

ASTM D1193 Standard Specification for Reagent Water
ASTM D4175 Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants*， 2023-07-01 Update
ASTM D4806 Standard Specification for Denatured Fuel Ethanol for Blending with Gasolines for Use as Automotive Spark-Ignition Engine Fuel
ASTM D5798 Standard Specification for Fuel Ethanol (Ed75-Ed85) for Automotive Spark-Ignition Engines

2020 ASTM D6423-20a Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
2020 ASTM D6423-20 Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
2019 ASTM D6423-19 Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
2018 ASTM D6423-18 Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
2014 ASTM D6423-14 Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
2008 ASTM D6423-08 Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)
1999 ASTM D6423-99(2004) Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)
1999 ASTM D6423-99 Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)