Crestron (formerly Bayer) Desmodur I Isophorone Diisocyanate IPDI 4098-71-9

2023-11-20by admin0

Chemical name : 3-Isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate

Alias : 3-Isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate; 5-Isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane; IPDI

IPDI products are mixtures containing 75% cis and 25% trans isomers.

Molecular Formula


Relative Molecular Mass






Physical and Chemical Properties

Isophorone Diisocyanate IPDI is colorless or light yellow liquid with camphor-like odor, completely miscible with esters, ketones, ethers, aromatic hydrocarbons and aliphatic hydrocarbons and other organic solvents.



Melting point

– 60°C

Boiling point

158°C (15 mmHg)

Refractive index


Flash Point


Water Solubility

<0.1 g/100 mL at 25°C

Performance Indicators

The specifications for IPDI products (brand name Desmodur I) are:


≥99.5 %

Mass fraction of NCO


Color (Hazen)


Hydrolyzed chlorine

≤200 mg/kg

Total chlorine

≤400 mg/kg

Viscosity (25℃)

Approx. 10 mPa-s.

Safety data

Hazardous material symbol


Hazardous category code


Safety instructions


Dangerous Goods Transportation Number

UN 2290/2906

Properties and Uses

IPDI is an aliphatic isocyanate, isophorone diisocyanate IPDI is also a kind of cycloaliphatic isocyanate, isophorone diisocyanate IPDI reactivity is lower than the aromatic isocyanate, and the vapor pressure is also lower. The reactivity of 2 NCO groups in isophorone diisocyanate IPDI molecule is different, because the primary NCO in IPDI molecule is hindered by the cyclohexane ring and a-substituted methyl group, which makes the reactivity of the secondary NCO group connected to cyclohexane is 1.3-2.5 times higher than that of the primary NCO; the reactivity of IPDI and hydroxyl group is 4-5 times faster than that of HDI and hydroxyl group.
The polyurethane resin made of isophorone diisocyanate IPDI has excellent light stability and chemical resistance, isophorone diisocyanate IPDI is generally used in the manufacture of high-grade polyurethane resins, such as light-resistant and marble-resistant polyurethane coatings, abrasion-resistant and hydrolysis-resistant polyurethane elastomers, and isophorone diisocyanate IPDI is also used in the manufacture of non-yellowing microcellular polyurethane foam.

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