Milling wheat procurement is governed by four specification parameters: protein content, Hagberg falling number, test weight, and moisture, with GAFTA contracts providing the standard contractual framework for international trade. Falling number is the parameter most often omitted from offers and the one most likely to render a cargo unusable for bread production regardless of protein.
Wheat is a commodity where the headline number — protein — is the least reliable predictor of baking performance. A 12.5 percent protein cargo with a falling number of 180 seconds will produce sticky, unsaleable bread. A 11.8 percent cargo at 320 seconds will perform. Mills know this. Traders offering into mills sometimes rely on buyers who do not.
For flour millers, industrial bakeries, feed compounders, and food manufacturers importing wheat at scale, the specification set and the contract framework do more to determine outcome than origin reputation does.
The Four Parameters That Govern Milling Value
Milling wheat quality is assessed principally through protein content, Hagberg falling number, specific test weight, and moisture, because together these predict dough strength, enzyme activity, flour extraction rate, and storage stability.
- Protein content: Typically 11.5 to 13.5 percent on a dry basis for bread wheat, determining gluten quantity and dough strength. Biscuit and cake flours require lower protein, commonly 9 to 10.5 percent
- Hagberg falling number: Measures alpha-amylase activity, which rises sharply with sprout damage. A minimum of 250 seconds is a common bread-wheat threshold; below roughly 220 seconds the flour produces sticky crumb and poor loaf structure
- Specific test weight: Usually 76 to 78 kg per hectolitre, correlating with kernel plumpness and achievable flour extraction — directly a milling yield question
- Moisture: Maximum 14.5 percent for safe storage. Above this, respiration, mould, and insect activity accelerate, and the buyer is effectively paying grain prices for water
Falling Number: The Parameter Buyers Forget
Hagberg falling number is a weather-driven quality attribute that can collapse across an entire origin in a single wet harvest, which is why it must be specified contractually rather than assumed from origin reputation.
The mechanism is straightforward and unforgiving:
- Rain before harvest triggers germination in the ear, activating alpha-amylase enzymes
- Alpha-amylase breaks down starch during dough proving, destroying the crumb structure the baker depends on
- The damage is irreversible — no post-harvest treatment restores a low falling number
- Blending is the only remedy, which means the buyer needs high falling number stock available to blend against, or the cargo goes to feed
Specify a minimum falling number, require it on the certificate of analysis at load port, and define whether a shortfall triggers rejection or a price allowance. Leaving it unstated hands the risk entirely to the buyer.
Wheat Classes and What They Are For
Wheat classes describe hardness, colour, and sowing season, and each class has a distinct end use that cannot be substituted without changing the flour's performance.
- Hard Red Winter: The volume bread-wheat class from the US plains, typically 11 to 13 percent protein, broad international acceptance
- Hard Red Spring: Higher protein, commonly 13 to 15 percent, used to lift blends and for high-volume pan breads
- Soft Red Winter: Lower protein, for biscuits, crackers, cakes, and pastry flours rather than bread
- Durum: Hardest class, semolina for pasta, assessed additionally on vitreousness and yellow pigment
- Milling wheat from Black Sea origins: Traded largely on protein and falling number against GAFTA terms, with quality varying materially by crop year
Our agricultural commodity procurement guide covers class selection alongside oilseeds and proteins.
GAFTA Contracts and Mycotoxin Limits
International wheat trade runs predominantly on Grain and Feed Trade Association standard contracts, which define quality determination, sampling, arbitration, and default remedies so that individual negotiations need only settle the commercial variables.
- Contract form: GAFTA forms differ by delivery basis; the form must match the Incoterm actually agreed rather than being adopted by habit
- Quality final at loading: Most forms make certificates at load port final, which places decisive weight on who appoints the superintendent
- Arbitration: GAFTA arbitration is the default dispute route, with strict time bars — missing a claim deadline extinguishes an otherwise valid claim
- Mycotoxins: Deoxynivalenol, zearalenone, and ochratoxin A limits apply under destination food law and should be written into the specification, not left to general merchantability
For the compliance layer around food-grade agricultural imports, see our note on agricultural sourcing specifications and certification.
Milling Wheat Specification Reference
| Parameter | Typical Bread-Wheat Spec | Consequence If Missed |
|---|---|---|
| Protein (dry basis) | 11.5% to 13.5% | Weak dough, poor loaf volume |
| Hagberg falling number | 250 seconds min | Sticky crumb, unsaleable bread |
| Test weight | 76 to 78 kg/hl | Reduced flour extraction, lower yield |
| Moisture | 14.5% max | Storage spoilage, mould, weight loss |
| Foreign matter | 2% max | Cleaning cost, equipment wear |
| DON (deoxynivalenol) | Destination limit | Regulatory rejection at import |
Frequently Asked Questions
What protein content is required for milling wheat?
Bread-making wheat is generally specified between 11.5 and 13.5 percent protein on a dry basis. Biscuit and pastry flours use softer wheat at roughly 9 to 10.5 percent. The correct figure depends on the flour specification and on what else is available in the mill's blend.
What is Hagberg falling number and why does it matter?
It is a measure of alpha-amylase enzyme activity, which increases when wheat begins to germinate in a wet pre-harvest period. A low falling number means starch breaks down during proving, producing sticky crumb and poor loaf structure. A minimum of 250 seconds is a common bread-wheat requirement.
Can low falling number wheat be corrected?
Not directly. The enzymatic damage cannot be reversed after harvest. The only practical remedy is blending with high falling number wheat to bring the composite above the required threshold, which requires suitable stock to be available.
What contract terms govern international wheat trade?
GAFTA standard forms are the dominant framework, defining quality determination, sampling, arbitration procedure, and default remedies. The specific form must correspond to the delivery basis agreed, and GAFTA arbitration carries strict time bars for lodging claims.
What minimum wheat volumes does XRT handle?
Containerised movements start from approximately 500 MT, with bulk vessel parcels from 3,000 MT for coasters and 25,000 MT and above for handysize and panamax stowage. Specification and origin are confirmed against the destination mill's blend requirement.
Ready to secure milling wheat against a verified specification? Contact XRT's agricultural desk at agro [at] xrtgroup.com or submit a requirement through our procurement portal.