KOMEX uses the East African Grading Standards for Grains. The standards specify the requirements, sampling, and testing methods for Grains traded on KOMEX.
1 Grading Standards for Maize (Corn) Grain:
The specific requirements for the shelled grains of the species Zea mays indentata L, (dent maize) and/or Zea mays indurata L, (flint maize), or their hybrids) are:
| Characteristics | Maximum limits | Method of test | ||
| Grade 1 | Grade 2 | Grade 3 | ||
| Foreign matter, % m/m | 0.5 | 1.0 | 1.5 | ISO 605 |
| Inorganic matter, % m/m | 0.25 | 0.5 | 0.75 | |
| Broken kernels, % m/m | 2.0 | 4.0 | 6.0 | |
| Pest damaged grains, % m/m | 1.0 | 3.0 | 5.0 | |
| Rotten & Diseased grains, % m/m | 2.0 | 4.0 | 5.0 | |
| Discoloured grains, % m/m | 0.5 | 1.0 | 1.5 | |
| Moisture, % m/m | 13.0 | 13.0 | 13.0 | EAS 285/ISO 711/712 |
| Immature/Shriveled grains, % m/m | 1.0 | 2.0 | 3.0 | ISO 605 |
| Filth, % m/m | 0.1 | 0.1 | 0.1 | |
| Total Aflatoxins, ppb | 10 | ISO 16050 | ||
| Aflatoxin B1, ppb | 5 | |||
| Fumonisin, ppm | 2 | |||
| Total Defectives Grains, % m/m | 4.0 | 5.0 | 7.0 | ISO 605 |
Note: Sampling shall be done in accordance with the EAS 79/ISO 13690.
Click on the link to download a comprehensive copy of The East African Grading Standards for Maize Grains