Test weight - conversion to larger volumes

Following the test weight procedures, a weight is obtained for the 0.5 litre volume of grain. However, the weight of grain in a 0.5 litre container must be converted to more meaningful volumes that are much greater than a 0.5 litre.

Two methods can be used:

1. Straight mathematical conversion: Simply multiply the weight to match the new volume. This does not take into account the compaction of grain that occurs when measured in larger volume containers.
2. Mathematical conversion based on calibration to a larger (100-litre) volume: The Canadian Grain Commission produces calibration charts that equate grams per 0.5 litre weights to weight per hectolitre (i.e. per 100-litres) using a conversion formula. As the weights are extended from per 0.5 litre to per hectolitre, compaction is taken into account. Compaction occurs as the grain's weight causes it to become more densely packed, and air pockets disappear.

Test weight is determined after the removal of dockage as defined in the cleaning procedures described for each class of grain.

Test weight on corn is determined prior to removal of cracked corn and foreign material.

Samples are graded Sample Account Light Weight only if the test weight is lower than the minimum established for that class of grain and in accordance with the Order of Precedence as stated in the Glossary section of the Canadian Grain Commission's Official Grain Grading Guide.