Description

4,4'-Diphenylmethane Diisocyanate (MDI) is a fundamental aromatic diisocyanate monomer essential for producing high-performance polyurethane polymers. Its primary value lies in its reactivity with polyols to form versatile polyurethane materials with tailored properties of strength, flexibility, and durability. This chemical is critically needed by manufacturers in the rigid & flexible foam, adhesive, coating, and elastomer industries to create a vast array of industrial and consumer products.

Application

• Rigid Polyurethane Foams: Primary raw material for insulation panels, refrigeration units, and construction materials.
• Flexible Polyurethane Foams: Key component in the production of cushioning for furniture, mattresses, and automotive interiors.
• Polyurethane Adhesives & Sealants: Used in wood composites, construction, and automotive assembly for high-strength bonding.
• Polyurethane Coatings: Provides durable, chemical-resistant, and protective finishes for industrial floors, pipelines, and automotive parts.
• Elastomers and Binders: Manufacture of industrial tires, rollers, gaskets, and synthetic leather (PU leather).
• Reaction Injection Molding (RIM): Used to produce solid, high-performance parts for automotive body panels and industrial equipment.

Basic Information

Product Name	4,4'-Diphenylmethane Diisocyanate
CAS No.	101-68-8
Molecular Formula	C15H10N2O2
Molecular Weight	250.25 g/mol
Synonyms	MDI; Methylene diphenyl diisocyanate; Diphenylmethane-4,4'-diisocyanate; 4,4'-MDI; Methylene bis(4-phenyl isocyanate); Isocyanic acid, methylenedi-p-phenylene ester; Desmodur 44; Hylene M-50; Nacconate 300; p,p'-Diphenylmethane diisocyanate
EINECS	202-966-0

Quality Control

Our 4,4'-Diphenylmethane Diisocyanate is manufactured under stringent process controls to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical testing including GC, HPLC, and titration methods. A Certificate of Analysis (COA) detailing purity, isomer content, and hydrolyzable chlorine is provided with each shipment to ensure compliance with your formulation requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures between 15°C and 25°C (59°F and 77°F). This product is hygroscopic (moisture-sensitive) and highly volatile. Containers must be kept tightly sealed under a dry inert gas (nitrogen) blanket to prevent moisture absorption and polymerization. Isolate from heat, open flames, and incompatible materials such as alcohols, amines, and water.

Specification

Item	Specification
Appearance	Colorless to pale yellow solid / melt
Identification (IR)	Conforms
Assay (GC / Titration)	≥ 99.5 %
4,4'-Isomer Content	≥ 98.0 %
Hydrolyzable Chlorine	≤ 0.01 %
Acidity (as HCl)	≤ 0.005 %
Melting Point	38 - 41 °C

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.