Wheat: 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 cleaned sample, or the net weight.
Hazardous substances in sample
Wear gloves and a mask to handle any samples that you suspect may contain hazardous substances. Hazardous substances are defined in section 1 of the Canada Grain Regulations as "any pesticide, desiccant or inoculant".
Rounding rules
Rounding rules are outlined in schedule 3 of the Canada Grain Regulations. When official inspection results are expressed numerically, they should be expressed to the same decimal precision as the applicable tolerance in the primary or export grade determinants table.
Processed sample
An unofficial sample of grain declared to be conditioned or cleaned to meet end user specifications, and whereas, the determination of dockage and/or determination of commercially clean are not performed or reported.
Standard prints
Standard prints are grain photographs prepared by the Canadian Grain Commission that are used for the assessment of visual grading factors as defined in the Standard of quality.
See Chapter 29 of this guide, Active Grain Standards List and see Frost and Mildew definitions in this chapter for applicable standards for each class.
Standard samples
Standard samples are physical grain samples prepared by the Canadian Grain Commission that are used for the assessment of visual grading factors as defined in the Standard of quality.
See Chapter 29 of this guide, Active Grain Standards List and see Frost and Mildew definitions in this chapter for applicable standards for each class.

Representative portion for grading

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

The optimum representative portion is the representative sample size within the minimum and maximum range used to obtain the most accurate result when assessing an objective factor. It is determined by taking into consideration the tolerance and concentration of the objective factor being assessed.

Representative portion of wheat for grading (in grams)
Grading factor Sample portion size range
Minimum Maximum
Artificial stain 250 g working sample
Binburnt kernels 250 g working sample
Blackpoint 25 g 50 g
Common bunt 50 g 100 g
Contrasting Classes 50 g 100 g
Darkened kernels 50 g 100 g
Dark immature kernels 50 g 100 g
Degermed kernels 25 g 50 g
Ergot 500 g working sample
Excreta working sample working sample
Fertilizer Pellets working sample working sample
Fireburnt working sample working sample
Foreign Material 50 g 250 g
Fusarium damage 10 g 100 g
Grass green kernels 50 g 250 g
Hard vitreous kernels, sieving 250 g 250 g
Hard vitreous kernels, handpick 10 g 25 g
Heated 25 g 250 g
Insect damage 50 g 100 g
Matter other than cereal grains 50 g 250 g
Mouldy 100 g working sample
Natural stain 50 g 100 g
Odour working sample working sample
Other cereal grains 50 g 250 g
Other cereal grains and other matter 50 g 250 g
Penetrated smudge 50 g 250 g
Pink kernels 50 g 250 g
Rotted 100 g working sample
Sawfly, midge damage 10 g 50 g
Sclerotinia 500 g working sample
Severe midge damage 50 g 100 g
Severely mildewed 100 g working sample
Severely sprouted 50 g 100 g
Shrunken and broken 250 g 250 g
Smudge 50 g 100 g
Soft earth pellets working sample working sample
Sprouted kernels 10 g 100 g
Stones working sample working sample
Total Damage 25 g 100 g
Treated seed working sample working sample
Wheats of other classes or varieties 15 g 50 g
Date modified: