Corn – Chapter 17
Official Grain Grading Guide

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Grading

Important definitions

Net weight of sample

The sample after cleaning and removal of dockage is referred to as the cleaned sample. Its weight is the net weight of the sample. Percentages by weight for grading refer to percentages of the net weight.

Hazardous substances in samples

Wear gloves and a mask to handle any samples that you suspect may contain hazardous substances. Hazardous substances are defined in the Regulations as “any pesticide, herbicide or desiccant.”

Representative portions for grading

All grading is done on representative portions divided down from the cleaned sample, using a Boerner-type divider.

Values in the following table represent a range of recommended portions of samples for grading. Refer to definition of “Representative portion” in the glossary for a complete description of the terms “Minimum”, “Optimum” and “Export”.

Representative portion of corn for grading, grams

Grading factor	Minimum	Optimum	Export
Caramelized kernels	100	500	500
Classes	100	working sample	working sample
Cracked corn and foreign material	working sample	working sample	working sample
Damage	100	500	500
Excreta	working sample	working sample	working sample
Fireburnt	working sample	working sample	working sample
Heated and rotted	100	500	working sample
Odour	working sample	working sample	working sample
Stones	500	working sample	working sample

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