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ASTM D 2699 Document Information:
Title
Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
ASTM International
Publication Date:
May 1, 2008
Scope:
This laboratory test method covers the quantitative
determination of the knock rating of liquid spark-ignition engine
fuel in terms of Research O.N., except that 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.
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.
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.
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 hazard statements, see
Section 8, 13.4.1, 14.5.1, 15.6.1, Annex A1, A2.3.9, A2.4.8,
A3.2.7.2(7), A4.2.3.1, A4.2.3.3(6) and (9), A4.3.5, X2.3.7,
X3.2.3.1, X3.3.4.1, X3.3.9.3, X3.3.11.4, and X3.5.1.8.
*A Summary of Changes section appears at the end of this
standard.
2 Motor O.N., determined using Test Method D 2700, is
a companion method to provide a similar but typically lower octane
rating under more severe operating conditions.
Keywords:
- guide table
- isooctane
- knock intensity
- n-heptane
- research octane number
- spark-ignition engine fuel performance
- toluene standardization fuel
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