Home › Chemicals › MDI (4,4'-Methylenebis(phenyl isocyanate)) CAS 101-68-8: MDI (4,4'-Methylenebis(phenyl isocyanate)) (C15H10N2O2) Identity CAS Number 101-68-8 Molecular Formula C15H10N2O2 IUPAC Name 1,1'-methylenebis(4-isocyanatobenzene) Molecular Weight 250.26 g/mol SMILES OC C1=CC=C(N=C=O)C=C1C1=CC=C(N=C=O)C=C1Synonyms MDI, methylene diphenyl diisocyanate, diphenylmethane diisocyanate
2D Structure
Physical Properties Density 1.23 g/mL at 25°C Boiling Point 314.0°C Melting Point 40.0°C Flash Point 196.0°C Vapor Pressure 0.001 kPa at 20°C Refractive Index nD = 1.59 Dielectric Constant ε = 12.0
Safety & GHS Classification GHS05 Irritant Health Hazard
H315: Causes skin irritation H317: May cause an allergic skin reaction H319: Causes serious eye irritation H332: Harmful if inhaled H334: May cause allergy or asthma symptoms or breathing difficulties if inhaled H335: May cause respiratory irritation H373: May cause damage to organs through prolonged or repeated exposure Storage: Store in cool, dry place under nitrogen. Moisture-sensitive — reacts with water to form CO2 and solid polyurea. Respiratory sensitizer — avoid all inhalation. Solid at room temperature — melt carefully (avoid overheating).
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Good PP Good PEEK Excellent PVDF Good
Rubbers Material Rating Viton Good NBR Good EPDM Good Silicone Good FKM Good
Metals Material Rating Stainless 316 Excellent Aluminum Excellent Copper Excellent Brass Excellent
Applications Polyurethane foam production (80% of demand) Spandex fiber manufacturing Adhesive manufacturing Coating and sealant production Elastomer manufacturing Thermal insulation panels Automotive interior components External References: PubChem
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