Screenings - Chapter 23 | Official Grain Grading Guide

Cleaning screenings

Feed screenings

  1. Divide a representative portion of approximately 500 g from the sample.
  2. Sift the portion over the No. 4.5 round-hole sieve to assess the percentage of small weed seeds, chaff, hulls, dust, etc.
  3. Handpick a representative portion of at least 10 g to determine the components of the sample.
  4. how the composition in detail in all records and endorse the backs of certificates.

Uncleaned screenings

Uncleaned screenings do not meet the specifications for No. 1 or No. 2 Feed screenings because of their content of weed seeds, hulls, chaff or dust. Uncleaned screenings must contain at least 35.0% of material that if separated would meet the grade requirements for No. 1 Feed screenings.

  1. Divide a representative portion of not less than 750 g from the uncleaned sample.
  2. Sift the portion over the No. 4.5 round-hole sieve to assess the percentage by weight of small weed seeds and dust.
  3. Handpick a representative portion not less than 10 g to determine the components of the sample.
  4. Show the composition of the sample in detail on all records and endorse the backs of certificates.

Refuse screenings

Refuse screenings do not meet the grade requirements for Uncleaned screenings because of their content of weed seeds, chaff or dust.

  1. Divide a representative portion of not less than 250 g from the uncleaned sample.
  2. Sift the representative portion over the No. 5 buckwheat and the No. 4.5 round-hole sieves nested to determine the percentage by weight of seeds.
  3. Class as large seeds those that pass through the No. 5 buckwheat sieve but remain on top of the No. 4.5 round-hole.
  4. Class as small seeds material that passes through the No. 4.5 round-hole sieve.
  5. Handpick a representative portion of at least 25 g of the material remaining on top of the 5 buckwheat sieve.

Notation as to kind

When no written request is received for a notation as to kind, such a notation is entered on the records only and it is stated that the notation does not appear on the certificate, for example, Canola—not shown on certificate.