KOMEX uses the East African Grading Standards for Grains. The standards specify the requirements, sampling, and testing methods for Grains traded on KOMEX.
2 Grading Standards for Wheat Grain:
The specific requirements for common wheat (Triticum aestivum L.), club wheat (T. compactum Host.), intended for human consumption, are:
| Characteristics |
Maximum limits | Method of test | ||||
| Grade 1 | Grade 2 | Grade 3 | Grade 4 | |||
| Varietal restriction | Approved varieties only | |||||
| Moisture, max (%) | 13 | 13 | 13 | 13 | ISO 711/712 | |
| Standard of quality | Minimum test weight kg/hl (g/0.5 L) | 79(395) | 75(375) | 70(350) | 65(325) | |
| Protein, min (%) m/m NX5.7@11 % Moisture basis | Hard/strong white | 13.0 | 12.0 | 11.5 | 10.0 | EAS 82 |
| Soft white | 10.0 | 10.0 | 10.0 | 10.0 | ||
| Foreign matter, % m/m | Total | 0.40 | 0.70 | 1.30 | 2.40 | ISO 605 |
| Unmillable Material Above the Screen (% by wt) | 0.60 | 0.60 | 0.60 | 0.60 | ||
| Screenings, Max (% by wt) | 5.0 | 5.0 | 5.0 | 0.60 | ISO 5223 | |
| Falling Number, Min (sec) | 350 | 300 | 300 | 300 | ||
| Edible grains other than wheat (whole or identifiably broken), (% by wt) | 0.50 | 1.50 | 2.0 | 3.0 | ISO 7970 | |
| Wheat of other classes or varieties (% by wt) | Contrasting classes | 1.0 | 2.0 | 3.0 | 5.0 | |
| Total | 3.0 | 3.0 | 5.0 | 5.0 | ||
| Defective grains, max (% by count, 300 grain sample, unless otherwise stated | Total Defective | 3.0 | 5.0 | 10.0 | 15.0 | ISO 605 |
| Bulk density kg/hl, min | 70 | ISO 7971-1 & 2 | ||||
| Other contaminants, Max | Total Aflatoxin (AFB1+AFB2+AFG1 +AFG2)), ppb | 10 | ISO 16050 | |||
| Aflatoxin B1 only, ppb | 5 | |||||
| Fumonisin – Total ppm(FB1 + FB2 + FB3) | 2 | |||||
Note:
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- Sampling shall be done in accordance with the EAS 79/ISO 13690.
- Grade 4 to be for only partner states’ domestic use.
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Click on the link to download a comprehensive copy of The East African Grading Standards for Wheat Grains