ASTM D2699 (RON) is an internationally accepted test method using RON test engine to test the knock rating of spark-ignition engine fuel in terms of Research Octane Number.
ASTM D2699 (RON) test method is used to test the knock rating of spark-ignition engine fuel in Research Octane Number. The sample fuel is tested using a standardized RON test engine with a single cylinder, four-stroke cycle, variable compression ratio, carburetor. The RON test engine runs in accordance with a defined set of operating conditions. The octane number 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 octane number of the PRF blend that matches the knock intensity of the sample fuel establishes the Research Octane Number.
The test method has a working range from 40 to 120 octane number. Typical commercial fuels produced for spark-ignition engines rate in the 88 to 101 Research Octane Number range. Testing of gasoline blend stocks or other process stream materials can produce ratings at various levels throughout the Research Octane Number range.
For referenced ASTM standards, visit the ASTM website, www.astm.org