OF UNGROUND GRAIN IN A SUITABLE CONTAINER ( E.G . A 20 BY 12 CENTIMETRE ALUMINIUM PLATE WITH A 0.5 CENTIMETRE RIM ) , LEAVE TO DRY IN A HEATING CHAMBER FOR SEVEN TO TEN MINUTES AT A TEMPERATURE OF 130 * C , REMOVE FROM THE HEATING CHAMBER , LEAVE THE GRAINS UNCOVERED TO COOL IN A LABORATORY FOR TWO HOURS AND WEIGH ( WEIGHING MUST BE ACCURATE TO 10 MILLIGRAMMES ) . CRUSH THE PARTIALLY DRIED GRAINS AND DETERMINE THE REMAINING MOISTURE CONTENT AS DESCRIBED IN ( A ) .
5 . METHOD OF CALCULATION AND FORMULAE : ( SEE O.J . NO L 281 OF 1 . 11 . 75 )
6 . ACCURACY OF TEST :
THE DIFFERENCE BETWEEN TWO TESTS MADE ON THE SAME SAMPLE MUST NOT EXCEED MORE OR LESS 0.1 % OF MOISTURE .
( 1 ) AIR TEMPERATURE INSIDE THE HEATING CHAMBER .
( 2 ) ITS HEATING CAPACITY SHOULD BE SUCH THAT , WHEN IT HAS BEEN PRE-SET TO 131 * C , THAT TEMPERATURE CAN BE REGAINED IN LESS THAN 45 MINUTES AFTER THE MAXIMUM NUMBER OF TEST SAMPLES HAVE BEEN PLACED IN THE CHAMBER TO DRY SIMULTANEOUSLY . VENTILATION SHOULD BE SUCH THAT WHEN ALL THE TEST SAMPLES OF COMMON WHEAT IT CAN HOLD ARE DRIED FOR TWO HOURS , THE RESULTS DIFFER BY NO MORE THAN 0.15 % FROM THE RESULTS OBTAINED AFTER DRYING FOR FOUR HOURS .