Epoxidized soybean oil, better known by its acronym, ESBO, is a plasticizerused in polyvinyl chloride (PVC) plastics.It serves as a plasticizer and as a scavenger for hydrochloric acid liberated from PVC when the PVC undergoes heat treatment.Food products that are stored in glass jars with metal lids need a gasket to make a good seal and the gasket is usually made from PVC. It forms an airtight seal preventing microbiological and other contamination.ESBO is one of the additives used in the PVC gasket. It serves as a plasticizer and a scavenger for hydrochloric acid released from PVC when the food product undergoes sterilization