How to use precision data when a fuel test result is disputed
ISO 4259-2:2026 covers the interpretation and application of precision data: comparing results, assessing conformity with a specification and settling disagreements.
- Part 2 answers a practical question: the laboratories of the supplier and the buyer differ — is it the same batch or a genuine non-conformity?
- The document also orders conformity assessment when a result lies close to a limit — the commonest source of trade disputes over fuels.
- Together with Part 1 it forms a set: the first says how precision figures arise, the second how to use them.
- A laboratory invoking these rules in its reports should check that it refers to the 2026 edition rather than the previous one.
Source: ISO 4259-2:2026 — Petroleum and related products: Interpretation and application of precision data