A certificate of analysis (CoA) is the seller's laboratory report describing the quality of the palm oil product being sold. It is an essential document, but it should not be accepted on trust alone. Before you pay, compare every value against the contractual specification and the physical reality of the shipment.
What a CoA Usually Shows
A typical CoA contains the product name and type (such as crude palm oil, RBD palm olein, or palm stearin), a batch or lot number, production date, packaging details, and a list of test results. It should also state the test methods used, the laboratory name, and the date of analysis.
Key Parameters to Check First
- Free fatty acids (FFA): A measure of hydrolytic breakdown. Lower values indicate fresher oil. The CoA must state the FFA as a percentage and specify the fatty acid basis (often palmitic acid). Check it against the contract maximum.
- Moisture and impurities (M&I): The combined amount of water and insoluble matter. High values reduce the actual oil content and can promote rancidity. The contract usually sets a maximum combined percentage.
- Iodine value (IV): A measure of unsaturation. It determines whether the product is a hard or soft fraction. For palm olein versus palm stearin, the IV must fall within the contract range.
- Melting point or slip point: Especially important for fractionated products. The value confirms the physical form the buyer expects.
- Colour: Often reported in Lovibond units. It affects the refined oil quality and may be specified.
- Peroxide value (PV): Indicates the early stages of oxidation. Higher values suggest the oil has begun to deteriorate.
- DOBI: The deterioration of bleachability index, used mainly for crude palm oil. A higher DOBI generally means the oil is easier to refine and will give a lighter colour.
- Phosphorus: In crude oil, this indicates residual gums. Excess phosphorus raises refining losses.
- Carotene content: Sometimes reported and may be relevant for specific markets.
How to Read and Verify
Compare every reported value to the contractual specification. Note whether the contract sets a maximum, a minimum, or a range, and confirm the CoA expresses the parameter in the same unit and by the same test method. A parameter can have different values depending on the analytical method, so a mismatch in method may be as serious as a failed result.
Look for internal consistency. For example, unusually high moisture often accompanies higher impurities. Check that the batch number, production date, and seal details on the CoA match the shipping documents for the exact goods you are paying for.
Examine the document for signs of alteration: handwritten corrections without a counter-signature, missing laboratory identification, illegible dates, or the absence of an accredited lab stamp. These are red flags.
If possible, arrange independent pre-shipment inspection or third-party sampling and testing from the actual cargo. The seller's CoA is not a substitute for your own verification, especially on first purchases or large volumes.
Red Flags and Practical Steps
- A parameter reported only as "pass" without a numeric value, unless the contract explicitly allows it.
- A CoA dated far before shipment or after payment, rather than from a representative sample of the cargo.
- Missing parameters that the contract specifically requires, such as no iodine value on a palm olein shipment.
- Handwritten changes without a second signature.
- A laboratory that is not accredited or is unknown in the trade.
If any value exceeds the contract limit, do not pay until the issue is resolved. Request a re-test, negotiate a price allowance, or reject the shipment depending on the contract terms and the severity of the deviation.
Final Checks Before Payment
Confirm that the CoA corresponds to the actual documents: bill of lading, packing list, and commercial invoice. The product type and grade must match everywhere. Keep the CoA on file as part of your quality records. If a dispute arises, the CoA is useful evidence, but it is not conclusive proof of cargo condition. Payment should only be released once all quality checks are satisfied.