The most common complaints with castor and edible oils are high acidity, dark colour, rancid odour, moisture and sediment, adulteration, contamination from dirty tanks, leaking packs and short weight. Most of these can be prevented with a clear spec, batch testing and checks at loading.
Many problems start before the oil is made, with poor seed, or after it leaves the plant, with poor packing or tanks.
Complaints about the oil
- High acid value or free fatty acid: caused by damaged or old seed, moisture or poor storage. In castor oil it affects many industrial uses. In edible oil it affects taste and frying life.
- Dark colour: from overheated pressing, poor seed or old oil. Colour is a key spec for lighter castor grades and refined edible oils.
- Rancidity: high peroxide or anisidine values, often from heat, light or air exposure during storage.
- Moisture and sediment: haze, foots or water at the bottom of drums, common in filtered and cold-pressed oils.
- Off-odour or off-flavour: burnt notes, solvent smell or taints from previous cargo.
- Adulteration: blending cheaper oils into groundnut, sesame or mustard oil. See how to check edible oil for adulteration.
- Contaminants: aflatoxin in unrefined groundnut oil, residues, PAHs or refining contaminants above your market's limits.
Complaints about packing and transport
- Leaking drums, tins or PET bottles from weak seams, poor caps or rough handling.
- Rusted or dented tins, especially on long, humid voyages.
- Flexitank leaks or failures, which can damage the container and other cargo.
- Tank contamination from poorly cleaned ISO tanks or ship tanks.
- Thick or solid oil at arrival in cold weather, making discharge slow without heating.
- Short weight, from underfilled drums, wrong tare weights or loss in transit.
- Label errors: wrong batch numbers, dates or ingredient details on retail packs.
How to prevent them
- Write a clear spec with limits for acid value or FFA, peroxide value, moisture, colour and the contaminants your market needs. See what acid value, iodine value and colour castor oil should have.
- Test a sample from the actual batch at an independent lab before shipment.
- Agree the pack and its quality: new drums, food-grade tins, certified flexitanks, clean tanks with previous cargo records.
- Check fill weights on a sample of drums or tins at loading.
- Draw and seal reference samples at loading, so any claim has evidence.
- Plan for climate: heating for cold arrivals, protection from heat and light for retail packs.
If a problem arrives
Photograph the containers and packs before unloading, keep the seals and draw samples in the presence of a surveyor if the issue is serious. Test your arrival sample against the sealed loading sample. Then raise the claim in writing, citing the contract spec and the lab results. Our guide on why quality drops after the first container explains how to stop issues returning.
How we help
We test each batch at an NABL-accredited lab before shipment, check packs and fill weights at the plant and seal reference samples at loading. If a claim arises, we help you assemble the evidence and present it to the supplier. Ask for a free sourcing review.