Margin of error: if the ash content does not exceed 1 %, the results of a double test must not differ by more than 0,02 units of ash content; if the ash content exceeds 1 %, the difference must not exceed 2 % of the ash content. If the difference exceeds these limits the test must be repeated.

The ash content must be expressed per 100 parts of dry matter and rounded up to 0,01.