Used Cooking Oil (UCO): specifications, quality and commercial criteria

UCO may pass through restaurants, collection depots and intermediate tanks before shipment. A useful origin map records those steps and shows where loads are combined.

This chain does not prove quality by itself. It helps reviewers locate changes, investigate anomalies and judge whether the declared material category fits the destination rules.

Heating, food residues and storage can alter water content, acidity and the fatty-acid mix. Samples therefore need a defined point, date and method, with the laboratory report tied to the parcel.

FFA means free fatty acids: compounds formed as fats break down. The result matters to pretreatment, but no single figure suits every plant or contract.

Sealed tanks, intake checks and cleaning records reduce accidental mixing. Previous cargoes and transfer hoses deserve attention because small residues can affect downstream processing.

Trap grease and sewage-derived fats are not interchangeable with used fryer oil. Definitions and legal treatment vary, so the agreed description must match both evidence and jurisdiction.

UCO can separate into liquid, solids and water during storage. Homogenisation, settling time and sampling sequence should be agreed before the truck, flexitank or vessel is loaded.

Cold conditions can increase viscosity or create crystals. Heating, when needed, should be controlled to avoid damage and documented as part of the custody record.

Waste classification, renewable-fuel accounting and chain-of-custody treatment depend on applicable schemes and law. A commercial description alone does not establish eligibility.

Reviewers should check declarations, mass-balance records and audit scope against the receiving market. Independent certification may be requested, but its validity and coverage must be confirmed for the specific transaction.