DINP Information Center

Technical properties of DINP

DINP is a general, all-purpose plasticiser.

Heat resistance, low temperature resistance and volatility resistance are some of its main properties that make it suitable for a wide range of applications.

Physico-chemical properties

CAS Reg. No: 68515-48-0 and 28553-12-0
(different alcohol chains depending on production method)
EINECS No:         271-090-9 and 249-079-5
Synonyms / IUPAC name: 1,2-Benzenedicarboxylic acid, di-C8-10 branched alkyl esters, C9-rich; Di-isononyl phthalate
Empirical Formula: C26H42O4 (average)
Structure:  illustration: DINP Structure

R1 and R2 (not necessary identical) are either mainly C8H17 to C10H21 or C9H19 isomers. In the case where R1 and R2 is C9H19 isomers, it is 10 % n-nonyl, 35-40 % methyloctyl, 40-45 % dimethylheptyl, 5-10 % methylethylhexyl.

Molecular weight:  420.6 (average) 
Melting point: -40 to -54°C
Boiling point: 424°C
Density:     ca. 0.975 at 20°C
Vapour pressure: 6 x 10-5 Pa at 20°C
Solubility in water: 0.6 µg/l 20°C
Henry's law constant:    41.4 pa' m3/mol
Log Kow: 8.8
Flash point: > 200°C
Autoflammability: ca. 380°C
Viscosity: 100-150 mPa's
Purity: DINP is a manufactured substance made by esterifying phthalic anhydride and isononanol. Isononanol is composed of different branched C9 alcohol isomers.
Impurities: Isononanol ca. 0.04%, isononylbenzoate ca. 0.03%, n-butyl-isononyl phthalate ca. 0.1%, water 0.02-0.03%.

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