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4, 4' -Diphenylmethane diisocyanate (MDI)

4, 4' -Diphenylmethane diisocyanate (MDI)

Basic Information

CAS No.: 101-68-8
Molecular Formula: C15H10N2O2
Molecular Weight:250.25

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Product Details

As an important organic compound, MDI is widely used in the production of polyurethane foams, elastomers, coatings, and adhesives.


Chemical Properties

Chinese NameMethylenediphenyl Diisocyanate
English NameMethylenediphenyl diisocyanates (Abbr.: MDI)
Chemical FormulaC₁₅H₁₀N₂O₂
Molecular Weight250.25
CAS No.101-68-8
EINECS No.202-966-0
Melting Point36 ~ 39 °C
Boiling Point196 °C
Water SolubilityDecomposes upon contact
Density1.19 g/cm³
AppearanceColorless or light yellow solid
Flash Point200 °C
ApplicationPolyurethane foam plastics, elastomers, coatings
Risk PhrasesR23, R34, R42/43
UN Dangerous Goods No.2489
China Dangerous Goods No.61545


Product Usage

Production of polyurethane elastomers—this is its primary application.

Manufacturing of synthetic fibers and artificial leather; for instance, it is used in certain synthetic leather products.

Production of solvent-free coatings and adhesives; it also finds application in the plastics and rubber industries.

Polyurethane foam made from it is used in sectors such as construction materials, automotive parts, and thermal insulation.


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