Full Description 1.1 This laboratory test method covers the quantitative determination of the knock rating of liquid spark-ignition engine fuel in terms of Research O.N., including fuels that contain up to 25 % v/v of ethanol. However, this test method may not be applicable to fuel and fuel components that are primarily oxygenates.2 The sample fuel is tested using a standardized single cylinder, four-stroke cycle, variable compression ratio, carbureted, CFR engine run in accordance with a defined set of operating conditions. The O.N. scale is defined by the volumetric composition of PRF blends. The sample fuel knock intensity is compared to that of one or more PRF blends. The O.N. of the PRF blend that matches the K.I. of the sample fuel establishes the Research O.N. 1.2 The O.N. scale covers the range from 0 to 120 octane number but this test method has a working range from 40 to 120 Research O.N. Typical commercial fuels produced for spark-ignition engines rate in the 88 to 101 Research O.N. range. Testing of gasoline blend stocks or other process stream materials can produce ratings at various levels throughout the Research O.N. range. 1.3 The values of operating conditions are stated in SI units and are considered standard. The values in parentheses are the historical inch-pound units. The standardized CFR engine measurements continue to be in inch-pound units only because of the extensive and expensive tooling that has been created for this equipment. 1.4 For purposes of determining conformance with all specified limits in this standard, an observed value or a calculated value shall be rounded \"to the nearest unit\" in the last right-hand digit used in expressing the specified limit, in accordance with the rounding method of Practice E29 . 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 Section 8 , 14.4.1 , 15.5.1 , 16.6.1 , Annex A1 , A2.2.3.1 , A2.2.3.3 (6 ) and (9 ), A2.3.5 , X3.3.7 , X4.2.3.1 , X4.3.4.1 , X4.3.9.3 , X4.3.11.4 , and X4.5.1.8 . 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.
ASTM D2699-24 history
2024ASTM D2699-24 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2024ASTM D2699-23b Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2023ASTM D2699-23a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2023ASTM D2699-23 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2022ASTM D2699-22a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2022ASTM D2699-22 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2021ASTM D2699-21 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2019ASTM D2699-19e1 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2019ASTM D2699-19 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2018ASTM D2699-18a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2018ASTM D2699-18 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2017ASTM D2699-17 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2016ASTM D2699-16e1 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2016ASTM D2699-16 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2015ASTM D2699-15a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2015ASTM D2699-15 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2013ASTM D2699-13b Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2013ASTM D2699-13a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2013ASTM D2699-13 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2012ASTM D2699-12a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2012ASTM D2699-12 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2011ASTM D2699-11e1 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2011ASTM D2699-11 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2010ASTM D2699-10 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2009ASTM D2699-09e1 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2009ASTM D2699-09 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2008ASTM D2699-08 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2007ASTM D2699-07a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2007ASTM D2699-07 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2006ASTM D2699-06a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2006ASTM D2699-06 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2004ASTM D2699-04a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2004ASTM D2699-04e1 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2004ASTM D2699-04 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2003ASTM D2699-03a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2003ASTM D2699-03 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2002ASTM D2699-02 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2001ASTM D2699-01a Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
2001ASTM D2699-01 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
1999ASTM D2699-99 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
1992ASTM D2699-92 Standard Test Method for Knock Characteristics of Motor Fuels by the Research Method