Grain is the oldest traded commodity in the world and it still behaves like one. Very little about a grain purchase is settled by regulation; almost all of it is settled by a contract form, an allowance schedule and an analysis clause. Buyers arriving from a food ingredient background, where the specification is the document that governs, usually find this the most disorienting part of the trade.
What is actually graded
Cereals are graded on a small set of parameters, and each one is a proxy for something the buyer’s process cares about.
| Parameter | What it stands in for | Status |
|---|---|---|
| Moisture | Storage safety and the water you are paying for | Contract, referenced to ISO 712 |
| Test weight | Kernel soundness and milling yield | Contract, referenced to ISO 7971 |
| Protein | The ceiling on dough performance | Contract, with the nitrogen factor named |
| Falling number | Sprout damage and enzyme activity | Contract, referenced to ISO 3093 |
| Admixture and foreign matter | Cleaning cost and yield loss | Contract |
| Broken and damaged grains | Handling and drying history | Contract |
| Mycotoxins, metals, residues | Food and feed safety | Regulation (EU) 2023/915 and Regulation (EC) No 396/2005 |
The distinction in that last column is the one to internalise. Everything above the line is negotiable and priced; everything below it is not.
The paperwork is the trade
A grain cargo rarely fails on quality. It fails because a certificate was issued on the wrong date, described a commodity code that does not match the declaration, or was applied for after the container was sealed. The document chain runs from the contract form through hold or container cleanliness, sampling and sealing, the phytosanitary certificate under Regulation (EU) 2016/2031 in the ISPM 12 format, the fumigation record, the quality and weight certificates, origin and customs, and the CHED notification in TRACES NT.
The sequence matters as much as the content, and it is set out step by step in the grain export documentation guide. Two of the pieces that cause the most trouble have their own answers: what a phytosanitary certificate is and whether the cargo has to be fumigated.
Loading mode is a quality decision
Whether a parcel moves in a vessel hold, a lined bulk container, big bags or sacks is usually decided on cost per tonne, and that is the wrong single criterion. The mode determines moisture migration during the voyage, exposure to previous-cargo taint, whether a segregation claim such as organic or non-GM can be demonstrated at all, and what evidence exists if the cargo arrives out of condition.
Stowage factor is the number that surprises people: wheat occupies roughly 1.25 to 1.30 cubic metres per tonne and barley roughly 1.45 to 1.55, while sunflower seed in shell is far bulkier, so a container cubes out long before it reaches its payload limit. The bulk logistics guide sets out the comparison.
Where to go next
- Milling wheat – protein bands, falling number and the rheology a miller actually needs.
- Barley – the malting against feed split and what separates them.
- Buckwheat groats – roasted and green kernel, and the gluten-free claim.
- Corn grits – granulation profiles and why fat content predicts shelf life.
- Moisture limits for export – why 14 per cent is practice rather than law.
- Reading a quality certificate – start at the sampling clause.