ETO treatment means fumigating a product with ethylene oxide, a gas once used to reduce microbes in spices and sesame seeds. EU buyers reject it because ethylene oxide is not permitted for use on food in the EU, and residue limits are set at the limit of quantification, so even traces fail.
From 2020, EU authorities found ethylene oxide residues in sesame seeds from India. This led to large recalls across Europe and stricter checks on Indian sesame and spices.
Why it was used
Ethylene oxide kills bacteria, yeast and mould without heat. That made it attractive for products such as spices, where heat can damage colour and flavour. It is cheap to apply and works on product already in bags.
The problem is what it leaves behind. Ethylene oxide and its breakdown product 2-chloroethanol can remain in the food. Ethylene oxide is classed as a carcinogen, which is why the EU does not allow it on food.
What the EU recalls changed
The sesame findings spread quickly to other products, including spices and ingredients made with them. Many finished foods were recalled because one ingredient carried residues. For importers, the cost of a positive test was not one container. It was every product made from it.
The EU responded with closer controls on Indian sesame and spices. The exact measures and sampling rates have changed over time. Check the current position with your national food safety authority or your customs broker before you ship.
The episode also changed how many European buyers choose suppliers. Several now ask for evidence of the microbial reduction method, test every lot for ethylene oxide, and refuse product from any plant that cannot show how it treats goods. A supplier that says "we do not use ETO" without being able to show an alternative process deserves a closer look.
How to protect yourself
You cannot see ETO residue and you cannot clean it off. Protection comes from the contract, the process and the test.
- Write "no ETO treatment at any stage" into your specification and purchase contract.
- Ask for microbial reduction by an accepted method such as steam sterilisation if you need low counts.
- Test for both ethylene oxide and 2-chloroethanol, not just one of them.
- Use a lab with a validated method for these compounds, and have the sample drawn by someone working for you.
- Ask whether any raw material was bought already treated. A processor may not fumigate, but a supplier upstream might.
- Keep a sealed counter-sample from each lot in case of a later claim.
Other markets
Rules differ outside the EU. Some countries allow ethylene oxide for certain uses or set different limits. If you sell into more than one market, write the spec to the strictest one you supply. Many buyers outside the EU now ask for "no ETO" anyway, because their own customers do.
Residue rules for ETO and other substances change. Check the current limits with your own food safety authority, and see our wider guide to common quality problems with Indian agri exports.
How we help
We put "no ETO treatment" into the spec, check the processor's microbial reduction method on site, and have sealed samples tested for ethylene oxide and 2-chloroethanol at an NABL-accredited lab. Ask for a free sourcing review.