Diisononyl phthalate (DINP) is a clear, colorless, and almost odorless liquid chemical. It is soluble in most organic solvents. DINP is typically a mixture of chemical compounds consisting of various isononyl esters of phthalic acid. DINP is primarily used as a PVC plasticizer. As compared to DOP, the low volatility and better endurability of DINP significantly reduces the fume emissions during the processing procedure and improves its permanence in the final product.