Poly[(phenyl isocyanate)-co-formaldehyde]

average Mn ~400

PMDI, Polymethylene polyphenyl isocyanate
Linear Formula:
CAS Number:
MDL number:
PubChem Substance ID:
Pricing and availability is not currently available.

vapor density

8.6 (vs air)



specific activity

~3.2 isocyanate groups/molecule

mol wt

average Mn ~400

refractive index

n20/D 1.634


1,800 cP(25 °C)(lit.)


392 °C/5 mmHg


1.2 g/mL at 25 °C (lit.)

SMILES string


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General description

Poly[(phenyl isocyanate)-co-formaldehyde] (P-MDI) is a chain extender with one isocyanate group attached to each of the phenyl groups. It is a liquid polymer that is used to maintain uniformity in the cross-linking reaction between different polymeric units during the curing process. Its crosslinking sites (−NCO) allow it to be utilized in the preparation of polyurethanes.
Poly[(phenyl isocyanate)-co-formaldehyde] (PPIF) is an oligomer that can be used as a chain extender and a cross-linker that forms amide linkages (−NCO). It is highly reactive with hydroxyl groups, which facilitate the formation of a polyurethane network.


P-MDI is an isocyanate that can be used in the preparation of polyurethane resins, films and foams. It can form mechanically robust films which are resistant to solvents and can be used as OTFT based electrodes in biomaterials based applications.
PPIF can be blended with a diol to form a polyurethane mixture with characteristic −NCO peaks. It can also be used as a cross-linker to form high tensile dielectric materials for potential application in organic electronics.


100 mL in glass bottle

Features and Benefits

High viscosity, high functionality oligomer.


Skull and crossbonesHealth hazard

Signal Word


Target Organs

Respiratory system


NONH for all modes of transport

WGK Germany


Highly cross-linked polyurethane with enhanced stability of second-order nonlinear optical properties.
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Exploration on high performance polyamide 1010/polyurethane blends filled with functional graphene nanoplatelet: physical properties and technical application
Kausar A
Journal of the Chinese Advanced Materials Society, 5(2), 133-147 (2017)
Second-order nonlinear optical properties and relaxation dynamics of aligned cross-linked polyurethanes with hemicyanine-type chromophores.
Lee K, et al.
Journal of the Optical Society of America B: Optical Physics, 15(1), 393-400 (1998)
Biomaterials-based organic electronic devices.
Bettinger CJ and Bao Z
Polymer International, 59(5), 563-567 (2010)

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