Yes, our laundry sheets are OECD-301B certified. The OECD Guidelines for testing chemicals are a collection of the most relevant and internationally agreed testing methods used by governments, industries and independent laboratories to assess the safety of chemicals. The OECD-301B test is an assessment of biodegradability over a 28 day period in an aerobic environment, this allowed us to ensure our laundry sheets dissolve and biodegrade rapidly and cleanly into the environment.