The number moves with the method
Falling Number is sensitive to sampling, grinding and even the altitude at which the test is run. Two honest laboratories can return materially different results on the same cargo if the protocol is not fixed in advance, which is why most disputes are really protocol disputes wearing a quality costume.
Fix the protocol, not just the figure
A contract that states a minimum Falling Number but says nothing about how it will be measured has fixed only half the parameter. The sampling method, the number of increments, the compositing rule and the appointed inspector all belong in the contract alongside the number itself.
- Name the inspection company — SGS, Intertek or Bureau Veritas — in the contract.
- Agree the sampling protocol and increment count before shipment.
- State explicitly that the load-port certificate is final for settlement.
- Keep sealed counter-samples for the duration of the claim period.
Where these four points are agreed up front, disputes are rare. Where they are not, the certificate becomes an opening negotiating position rather than a settlement document.