Flaxseed: Export shipments

Export shipments can be commercially clean or not commercially clean.

Commercially clean

Shipments are defined as commercially clean when the net dockage does not exceed 2.5% of the sample weight.

Dockage is reported to the nearest 0.1%.

A deduction for broken and reasonably sound flaxseed handpicked from the material and removed as dockage is allowed

  • On shipments not for direct export, of up to 0.50%
  • On shipments for direct export, of up to 0.75%

Not commercially clean (NCC)

Shipments that do not meet the standards for commercial cleanliness are referred to as not commercially clean. Such shipments are allowed only with the permission of the Canadian Grain Commission.

For samples representing not commercially clean shipments approved by the Canadian Grain Commission for shipment from terminal elevators, dockage is reported to the nearest 0.1%.

  • Instead of the allowances for broken seed in commercially clean shipments, a direct deduction of up to 0.2% is applied to establish net dockage for direct shipments only.

Determination of dockage

Follow procedures for normal cleaning, with the Carter dockage tester set up as follows.

Carter dockage tester specifications
Setting Commercially clean Not commercially clean
Feed control #3 #4
Air control #2 #3
Riddle None None
Top sieve Blank tray Blank tray
Centre sieve None None
Bottom sieve None None
Sieve cleaner Off Off

You will also need the following hand sieves.

Round-hole sieves

  • number 4.5

Wire sieves

  • number 4x14
  • number 3x16

Composition of dockage

In export grade flaxseed, dockage consists of

  • Material that remains on top of the wire sieve
  • Material that passes through the number 4.5 round-hole hand sieve, less the applicable allowance of broken and reasonably sound flaxseed
  • Material removed by aspiration
  • Inseparable material up to established grade tolerances, handpicked from the cleaned sample


Flaxseed on export is graded in accordance with primary and export grade determinants tables.

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