Diphenyl-isodecyl phosphite is a chemical compound used as a plasticizer and flame retardant. It is also used in some lubricants and as an additive in polymers and coatings. It is a clear, colorless liquid with a mild odor and low volatility. It is soluble in many organic solvents, including alcohols and glycols. It is an effective flame retardant and plasticizer, and is used in the production of polymers, rubber, elastomers, and other plastics. It can also be used in coatings and adhesives to improve durability and flexibility.