METHYLENE DIPHENYL DIISOCYANATE (MDI)

Methylene Diphenyl Diisocyanate (MDI) is an aromatic diisocyanate widely used as a raw material in the production of polyurethane foams, adhesives, sealants, elastomers, and coatings.
MDI is known for its high reactivity, excellent mechanical strength, and superior chemical resistance in cured materials.
Methylene Diphenyl Diisocyanate (MDI) exists in several forms, including pure MDI, polymeric MDI, and modified prepolymers, each optimized for specific applications.

CAS Number: 101-68-8
EC Number: 202-966-0
Molecular Formula: C15H10N2O2
Molecular Weight: 250.25 g/mol

Synonyms: Diphenylmethane-4,4'-diisocyanate, 4,4'-MDI, Pure MDI, Polymeric MDI, Diisocyanate Diphenylmethane, Aromatic Diisocyanate, MDI Monomer, MDI Prepolymer, Urethane Intermediate, PU Resin Hardener, Methylene Diphenyl Diisocyanate (MDI), MDI, 4,4′-Methylene Diphenyl Diisocyanate, Diphenylmethane Diisocyanate, 4,4′-Diphenylmethane Diisocyanate, 2,4′-Methylene Diphenyl Diisocyanate, 2,2′-Methylene Diphenyl Diisocyanate, 4,4′-MDI, 2,4′-MDI, Polymeric MDI, pMDI, Monomeric MDI, MDI Isocyanate, MDI Diisocyanate, Methylenebis(phenyl isocyanate), Bis(4-isocyanatophenyl)methane, 4,4′-Methylenebis(phenylisocyanate), Diphenylmethane-4,4′-diisocyanate, 4,4′-Methylenebis(phenyl isocyanate), MDI Chemical, MDI Compound, MDI Material, MDI Product, MDI Substance, MDI Technical Grade, MDI Industrial Grade, MDI Pharmaceutical Grade, MDI Laboratory Grade, MDI Research Grade, MDI Pure, MDI Extra Pure, MDI High Purity, MDI Refined, MDI Stabilized, MDI Certified, MDI Certified Standard, MDI Analytical Standard, MDI Laboratory Standard, MDI Certified Reagent, MDI Laboratory Reagent, MDI Test Reagent, MDI Assay, MDI Bulk Chemical, MDI Commercial Grade, MDI Raw Material, MDI Fine Chemical, MDI Specialty Chemical

APPLICATIONS

Methylene Diphenyl Diisocyanate (MDI) is used as a key raw material in polyurethane production.
Methylene Diphenyl Diisocyanate (MDI) reacts with polyols to form rigid and flexible polyurethane foams.
Methylene Diphenyl Diisocyanate (MDI) provides excellent strength, adhesion, and durability in polymer systems.

Methylene Diphenyl Diisocyanate (MDI) is applied in rigid foam insulation materials.
Methylene Diphenyl Diisocyanate (MDI) offers superior thermal insulation performance in buildings and appliances.
Methylene Diphenyl Diisocyanate (MDI) enhances structural integrity and dimensional stability of foam panels.

Methylene Diphenyl Diisocyanate (MDI) is used in spray foam insulation.
Methylene Diphenyl Diisocyanate (MDI) ensures uniform cell structure and high compressive strength.
Methylene Diphenyl Diisocyanate (MDI) improves energy efficiency in residential and industrial insulation systems.

Methylene Diphenyl Diisocyanate (MDI) is incorporated in flexible polyurethane foams.
Methylene Diphenyl Diisocyanate (MDI) provides softness, elasticity, and resilience in furniture and bedding applications.
Methylene Diphenyl Diisocyanate (MDI) supports consistent performance in automotive seats and cushions.

Methylene Diphenyl Diisocyanate (MDI) is applied in elastomer formulations.
Methylene Diphenyl Diisocyanate (MDI) produces tough, wear-resistant elastomers with excellent mechanical strength.
Methylene Diphenyl Diisocyanate (MDI) is used for wheels, rollers, and vibration-damping components.

Methylene Diphenyl Diisocyanate (MDI) is used in adhesives and sealants.
Methylene Diphenyl Diisocyanate (MDI) provides strong adhesion to metals, wood, and composites.
Methylene Diphenyl Diisocyanate (MDI) enhances flexibility and impact resistance of bonding systems.

Methylene Diphenyl Diisocyanate (MDI) is incorporated in coatings and paints.
Methylene Diphenyl Diisocyanate (MDI) produces tough, chemically resistant polyurethane coatings.
Methylene Diphenyl Diisocyanate (MDI) improves gloss, hardness, and weatherability of finished surfaces.

Methylene Diphenyl Diisocyanate (MDI) is applied in construction materials.
Methylene Diphenyl Diisocyanate (MDI) is used for insulation boards, laminates, and sandwich panels.
Methylene Diphenyl Diisocyanate (MDI) enhances energy efficiency and acoustic performance in building systems.

Methylene Diphenyl Diisocyanate (MDI) is used in the automotive industry.
Methylene Diphenyl Diisocyanate (MDI) contributes to lightweight, impact-resistant vehicle parts.
Methylene Diphenyl Diisocyanate (MDI) improves thermal insulation in headliners and interior components.

Methylene Diphenyl Diisocyanate (MDI) is incorporated in footwear manufacturing.
Methylene Diphenyl Diisocyanate (MDI) produces lightweight, flexible, and durable shoe soles.
Methylene Diphenyl Diisocyanate (MDI) ensures comfort and long-term performance in sports and safety footwear.

Methylene Diphenyl Diisocyanate (MDI) is used in binders for wood and particleboard.
Methylene Diphenyl Diisocyanate (MDI) improves moisture resistance and bonding strength of engineered wood panels.
Methylene Diphenyl Diisocyanate (MDI) enables formaldehyde-free wood adhesive systems.

Methylene Diphenyl Diisocyanate (MDI) is applied in composite materials.
Methylene Diphenyl Diisocyanate (MDI) enhances fiber-matrix adhesion in reinforced plastics.
Methylene Diphenyl Diisocyanate (MDI) improves thermal and mechanical stability of composites.

Methylene Diphenyl Diisocyanate (MDI) is used in soundproofing and vibration-damping materials.
Methylene Diphenyl Diisocyanate (MDI) provides structural integrity and acoustic absorption.
Methylene Diphenyl Diisocyanate (MDI) contributes to comfort and safety in transportation and construction sectors.

Methylene Diphenyl Diisocyanate (MDI) is incorporated in rigid packaging foams.
Methylene Diphenyl Diisocyanate (MDI) provides cushioning and impact protection for delicate goods.
Methylene Diphenyl Diisocyanate (MDI) ensures lightweight yet durable protective packaging.

Methylene Diphenyl Diisocyanate (MDI) is applied in mining and tunnel construction.
Methylene Diphenyl Diisocyanate (MDI) is used for rock consolidation and cavity filling.
Methylene Diphenyl Diisocyanate (MDI) provides fast-curing, high-strength foam for underground stabilization.

Methylene Diphenyl Diisocyanate (MDI) is primarily used in the production of rigid polyurethane foams.
Methylene Diphenyl Diisocyanate (MDI) provides excellent thermal insulation and dimensional stability for refrigeration and construction industries.
Methylene Diphenyl Diisocyanate (MDI) improves energy efficiency in buildings through its closed-cell foam systems.

Methylene Diphenyl Diisocyanate (MDI) is applied in flexible foam formulations for furniture, bedding, and automotive seating.
Methylene Diphenyl Diisocyanate (MDI) enhances comfort, elasticity, and durability in cushioning materials.
Methylene Diphenyl Diisocyanate (MDI) ensures consistent cell structure and mechanical performance in flexible foam products.

Methylene Diphenyl Diisocyanate (MDI) is utilized in the production of adhesives and sealants.
Methylene Diphenyl Diisocyanate (MDI) reacts with polyols to form durable urethane bonds with strong adhesion to wood, metal, and concrete.
Methylene Diphenyl Diisocyanate (MDI) is used in moisture-curing adhesives that offer excellent resistance to water and chemicals.

Methylene Diphenyl Diisocyanate (MDI) is used in the manufacture of coatings and paints.
Methylene Diphenyl Diisocyanate (MDI) provides hardness, chemical resistance, and weatherability to industrial coatings.
Methylene Diphenyl Diisocyanate (MDI) improves abrasion and impact resistance in high-performance finishes.

Methylene Diphenyl Diisocyanate (MDI) is used in the production of elastomers and cast polyurethane products.
Methylene Diphenyl Diisocyanate (MDI) enhances flexibility, tensile strength, and wear resistance in molded and cast parts.
Methylene Diphenyl Diisocyanate (MDI) is used in rollers, gaskets, and automotive bushings for its high mechanical stability.

Methylene Diphenyl Diisocyanate (MDI) is employed in the composite wood industry.
Methylene Diphenyl Diisocyanate (MDI) acts as a binder for oriented strand board (OSB), particleboard, and medium-density fiberboard (MDF).
Methylene Diphenyl Diisocyanate (MDI) reduces formaldehyde emissions and provides high moisture resistance in engineered wood.

Methylene Diphenyl Diisocyanate (MDI) is used in construction insulation panels and spray foams.
Methylene Diphenyl Diisocyanate (MDI) delivers high R-values and excellent adhesion to diverse substrates.
Methylene Diphenyl Diisocyanate (MDI) is vital in spray-applied foam systems for roofing, wall insulation, and soundproofing.

Methylene Diphenyl Diisocyanate (MDI) is used in transportation applications for lightweight, durable components.
Methylene Diphenyl Diisocyanate (MDI) contributes to vehicle energy efficiency by reducing weight while maintaining strength.
Methylene Diphenyl Diisocyanate (MDI) provides noise and vibration damping in automotive interiors.

Methylene Diphenyl Diisocyanate (MDI) is employed in footwear manufacturing.
Methylene Diphenyl Diisocyanate (MDI) produces flexible soles with superior comfort and resilience.
Methylene Diphenyl Diisocyanate (MDI) enhances product longevity under repeated stress and environmental exposure.

Methylene Diphenyl Diisocyanate (MDI) is used as a cross-linking agent in polymer chemistry.
Methylene Diphenyl Diisocyanate (MDI) reacts with hydroxyl, amine, and carboxylic groups to form stable urethane or urea linkages.
Methylene Diphenyl Diisocyanate (MDI) provides controlled curing profiles in specialty polymer systems.

DESCRIPTION

Methylene Diphenyl Diisocyanate (MDI) is an aromatic diisocyanate used as a key intermediate in polyurethane chemistry.
Methylene Diphenyl Diisocyanate (MDI) contains two isocyanate functional groups capable of reacting with polyols and amines.
Methylene Diphenyl Diisocyanate (MDI) is essential in producing rigid foams, elastomers, adhesives, and coatings.

Methylene Diphenyl Diisocyanate (MDI) has the CAS number 101-68-8.
Methylene Diphenyl Diisocyanate (MDI) has the EC number 202-966-0.
Methylene Diphenyl Diisocyanate (MDI) has the molecular formula C15H10N2O2.

Methylene Diphenyl Diisocyanate (MDI) has a molecular weight of 250.25 g/mol.
Methylene Diphenyl Diisocyanate (MDI) appears as a light yellow to brown crystalline solid or viscous liquid.
Methylene Diphenyl Diisocyanate (MDI) has a faint aromatic odor and is insoluble in water but soluble in organic solvents.

Methylene Diphenyl Diisocyanate (MDI) has a melting point around 39–43°C and a boiling point of 315°C.
Methylene Diphenyl Diisocyanate (MDI) reacts exothermically with compounds containing active hydrogen atoms.
Methylene Diphenyl Diisocyanate (MDI) forms polyurethane linkages when reacted with polyols or amines.

Methylene Diphenyl Diisocyanate (MDI) offers high mechanical, thermal, and chemical resistance in finished materials.
Methylene Diphenyl Diisocyanate (MDI) exists in several forms including pure MDI, polymeric MDI, and modified MDI.
Methylene Diphenyl Diisocyanate (MDI) should be stored in airtight containers under dry nitrogen to prevent moisture contamination and degradation.

Methylene Diphenyl Diisocyanate (MDI) is an aromatic diisocyanate consisting of two isocyanate groups attached to a diphenylmethane structure.
Methylene Diphenyl Diisocyanate (MDI) is a clear to light yellow liquid or crystalline solid depending on temperature and purity.
MDI is less volatile than toluene diisocyanate (TDI), making it safer to handle and more environmentally stable.

Methylene Diphenyl Diisocyanate (MDI) exhibits high reactivity with compounds containing active hydrogen atoms.
This property makes it a key component in polyurethane synthesis, producing both flexible and rigid materials.
MDI can be used alone or blended with polymeric variants to achieve specific performance properties.

Methylene Diphenyl Diisocyanate (MDI) forms strong, thermally stable polymers with outstanding chemical resistance.
Methylene Diphenyl Diisocyanate (MDI) produces foams with low thermal conductivity and excellent structural integrity.
MDI’s aromatic structure contributes to its rigidity and mechanical strength in polymer matrices.

Methylene Diphenyl Diisocyanate (MDI) reacts with moisture to release carbon dioxide, requiring dry handling conditions.
Methylene Diphenyl Diisocyanate (MDI) is sensitive to heat and should be stored under nitrogen or in tightly sealed containers.
Due to its reactivity, MDI should not be exposed to water or humid air during processing.

PROPERTIES

Appearance: Light yellow to brown liquid or crystalline solid
Odor: Slightly musty
Boiling Point: 314°C
Melting Point: 39–42°C
Density: 1.23 g/cm³ (25°C)
Vapor Pressure: <0.01 mmHg (25°C)
Flash Point: 220°C (closed cup)
Solubility: Insoluble in water; soluble in acetone, benzene, and toluene
Reactivity: Reacts exothermically with water, alcohols, and amines
Stability: Stable under dry, inert conditions
Storage Temperature: 20–30°C

FIRST AID

Inhalation:
Move the affected person to fresh air immediately.
If symptoms such as coughing or difficulty breathing occur, seek medical attention.

Skin Contact:
Remove contaminated clothing and wash skin thoroughly with soap and water.
Do not use solvents or thinners.
Seek medical attention for persistent irritation.

Eye Contact:
Rinse eyes with plenty of water for at least 15 minutes.
Seek immediate medical attention.

Ingestion:
Rinse mouth thoroughly with water.
Do not induce vomiting.
Seek immediate medical assistance.

Note to Physicians:
Treat symptomatically.
Observe for potential respiratory sensitization or bronchial effects.

HANDLING AND STORAGE

Handling:
Avoid inhalation and skin contact.
Wear protective gloves, goggles, and respirators if necessary.
Use only in well-ventilated areas or under fume extraction.

Ventilation:
Provide local exhaust ventilation in areas where vapors or aerosols may form.

Avoidance:
Avoid contact with water, alcohols, amines, and strong oxidizing agents.
Do not smoke or eat in work areas.

Spill and Leak Procedures:
Absorb spillage with dry sand or inert material.
Collect residues in suitable containers for disposal.
Ventilate the area thoroughly after cleanup.

Storage:
Store in a cool, dry, and well-ventilated place.
Keep containers tightly closed and protected from moisture.
Maintain storage under nitrogen or other inert gas.

Handling Cautions:
Do not heat above 40°C for extended periods.
Prevent contamination with metals or moisture.
Ensure containers are properly labeled and sealed at all times.