Heavy tails are a complex mixture composed of diglycerides and triglycerides of fatty acids ranging from C9 to C18, diglycerides and triglycerides of azelaic acid, and long-chain fatty acids (palmitic, stearic, and keto-stearic), with their primary application in the biofuelssector.

Two grades are available, IF001M and KF001M, both entirely derived from vegetable sources and ISCC-EU certified.