The current applicable O.N. rating range for Procedures B and C of D2699 and D2700 specify a range from 80 to 100 O.N. without a decimal point. The lack of a decimal point means that the trailing zeros could be interpreted as not significant. There is a potential for confusion regarding whether the range is from 75 to 104 or 80.0 to 100.0. Precedence has been set by Subcommittee E to adjust the minimum Cetane Number level in D975 from 40 to 40. to avoid any ambiguity (D02 10-04 Item 33). The applicable O.N. rating range for Procedures B and C of D2699 and D2700 should be updated to be from 80.0 to 100.0.
guide table; isooctane; knock intensity; n-heptane; research octane number; spark-ignition engine fuel performance; toluene standardization fuel; Knock characteristics; Motor octane number (MON); Automotive engine fuels/oils; Octane number/rating; Research octane number;
Citing ASTM Standards
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