Diisononyl phthalate (DINP) is a phthalic acid ester of isononyl alcohol (carbon number 9), and it is used as a plasticizer.

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DINP is a phthalic acid ester of isononyl alcohol (carbon number 9) that oxidized the butene dimer. Compared to general purpose plasticizer DOP, DINP has slightly lower plasticizing efficiency and machinability, but it has higher heat resistance, equaling to mixing ratio of 3/1 (DOP/DIDP).


Chemical name Diisononyl phthalate (DINP)
CAS number 28553-12-0
Existing chemical number 3-1307
Formula C26H42O4
Molecular weight 419
Structural formula
Functional group/compound classification Benzene ring, ester bond
Flow point (°C) -45
Boiling point (°C, 101.3kPa) 403
Specific gravity (20/20°C) 0.976
Flash point (°C, open) 235
Ignition point (°C) 374
Aqueous solubility (ppm/20°C) 1 or less
Fire Service Act Hazardous material, Class 4 Petroleum No. 4
Poisonous and Deleterious Substances Control Law Not applicable



DINP is a general purpose plasticizer that can be used in wide range of applications from extrusion of electrical wire, leather, etc., to calendar processing and plastisol processing. It has superior viscosity stability than DOP for plastisol composition.
Similar to DOP, it is a typical general purpose plasticizer used for wide range of flexible PVC products, but it is appropriate for application that requires higher heat resistance than DOP.

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