ISO 6540:1980 (R2017)

A section one specifies the reference method. It consists in grinding of sample, if necessery, after pre-conditioning, if required, then drying of a test portion at a temperature between 130 and 133 C under conditions which enable a result to be obtained which is in agreement with that obtained by the absolute method ( prescribed in an annex). A section two specifies the routine method on whole grains. It consists in drying of whole grains for 38 h at a temperature between 130 and 133 C.