PKI Method Validation

ISO 17507-2:2025 · Annex B

Agreement with the reference examples

Calculated PKI and methane number match the published values to three decimal places for 10 of the 12 reference mixtures in Annex B of ISO 17507-2:2025. In mixture 7, PKI differs by 0.001; in mixture 6, methane number differs by 0.001. These small differences occur near rounding boundaries. The final methane number, rounded to an integer, matches for all 12 mixtures.

The table compares the individual results. Each mixture can be expanded with the eye icon or loaded into the calculator with the calculator icon.

Calculating Annex B examples...

Reading the comparison

Calculated and reference values are displayed to three decimal places, as in Annex B.

Mixture numbers and reference values follow Annex B. Compositions are shown in mole percent.