Polymethylene polyphenylene isocyanate (MDI)

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Product Details:

Shelf Life 12 months if stored properly
Poisonous YES
Appearance Dark brown liquid
Density 1.22 Gram per cubic centimeter(g/cm3)
Molecular Weight 250.25 g/mol (approx. for monomer); polymeric forms vary
Physical Form Liquid
CAS No 9016-87-9
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Polymethylene polyphenylene isocyanate (MDI) Price And Quantity

Handling Precautions Use with adequate ventilation; personal protective equipment required
Packing Drums or IBC tanks
Vapor Pressure <0.0001 mmHg at 25°C
Flash Point >200°C (closed cup)
Stability Stable under recommended storage conditions
Boiling Point >200°C (decomposes)
Toxicity Toxic by inhalation, skin contact, and ingestion
Viscosity 150-250 mPa·s at 25°C

Polymethylene polyphenylene isocyanate (MDI) Product Specifications

Structural Formula Polymeric MDI structure - [-C6H4-NCO-CH2-]n
Shape Liquid
Storage Store in tightly sealed containers, away from moisture and direct sunlight, under cool and dry conditions
EINECS No 618-498-9
Application Production of polyurethane foams, elastomers, coatings, adhesives, sealants
Smell Pungent, characteristic isocyanate odor
Molecular Formula CH2[(C6H4)NCO]n
Melting Point 10 to 15C
Properties Highly reactive isocyanate; moisture sensitive; non-flammable; reacts exothermically with water; forms polyurethanes
Purity >99%
CAS No 9016-87-9
Physical Form Liquid
HS Code 29291020
Usage Used as a raw material/intermediate in chemical and industrial processes
Density 1.22 Gram per cubic centimeter(g/cm3)
Molecular Weight 250.25 g/mol (approx. for monomer); polymeric forms vary
Appearance Dark brown liquid
Poisonous YES
Shelf Life 12 months if stored properly
Grade Industrial Grade
Product Type Organic Compound
Ingredients Polymethylene polyphenylene isocyanate (MDI)
Solubility Insoluble in water; soluble in organic solvents

Handling Precautions Use with adequate ventilation; personal protective equipment required
Packing Drums or IBC tanks
Vapor Pressure <0.0001 mmHg at 25°C
Flash Point >200°C (closed cup)
Stability Stable under recommended storage conditions
Boiling Point >200°C (decomposes)
Toxicity Toxic by inhalation, skin contact, and ingestion
Viscosity 150-250 mPa·s at 25°C

Product Description

Typical specification

Polymethylene polyphenylene isocyanate

Item	Standard
Appearance	Brown liquid
Viscosity at 25C, mPa·s	150-250
NCO Content, %	30.5-32.0
Hydrolysable Chlorides, %	0.2max
Acid Content, %	0.03max
Density at 25C,g/cm3	1.220-1.250

Applications in Polyurethane Manufacturing

MDI is a critical intermediate in the production of polyurethane-based foams, coatings, elastomers, adhesives, and sealants. Its high reactivity allows it to form robust polymer structures, making it a preferred choice in industries like construction, automotive, and furniture manufacturing. MDI imparts durability, insulation, and flexibility to finished products, enhancing their performance characteristics.

Safety Precautions and Handling

Due to its toxicity and reactive nature, MDI must be handled with extensive safety measures. Personal protective equipment, including gloves and ventilation masks, is mandatory. The liquid should be stored in tightly sealed drums or IBC tanks, away from moisture and direct sunlight, under cool and dry conditions. Proper procedures reduce risk and maintain product quality throughout its shelf life.

Storage and Stability Considerations

MDI demonstrates stable properties when stored according to manufacturer recommendations. It should be kept in air-tight containers under cool, dry conditions. Proper storage extends its shelf life up to 12 months and prevents hazardous moisture-initiated reactions or decomposition. Maintaining stability ensures consistent performance in industrial applications.

FAQs of Polymethylene polyphenylene isocyanate (MDI):

Q: How should Polymethylene polyphenylene isocyanate (MDI) be stored to ensure stability?

A: MDI should be stored in tightly sealed containers such as drums or IBC tanks, away from moisture and direct sunlight, and under cool, dry conditions. These measures help maintain its stability and extend shelf life up to 12 months.

Q: What precautions are necessary when handling MDI in industrial settings?

A: When handling MDI, its vital to use proper personal protective equipment, such as gloves, goggles, and respirators. Ensure adequate ventilation to minimize inhalation risks, and avoid skin contact or ingestion, as MDI is toxic by all routes.

Q: Where is MDI commonly used in industrial processes?

A: MDI is widely used in manufacturing polyurethane foams, elastomers, coatings, adhesives, and sealants. Industries like construction, automotive, and furniture depend on MDI for its high reactivity and performance-enhancing properties.

Q: What benefits does MDI offer in polyurethane production compared to other isocyanates?

A: MDIs highly reactive nature leads to the formation of durable, resilient polymers. Its non-flammability and moisture sensitivity contribute to safe processing with proper controls, providing flexibility, strength, and insulation in end products.

Q: When does MDI decompose, and what should be avoided during processing?

A: MDI decomposes at temperatures above 200C. It should never be exposed to high heat or moisture, as these conditions can trigger hazardous decomposition or exothermic reactions, impacting safety and product integrity.

Q: What is the process for using MDI as a raw material in polyurethane applications?

A: MDI is blended with polyols during polyurethane manufacturing. The isocyanate reacts exothermically, forming solid polymers used in foams, coatings, and other materials. This controlled chemical process is fundamental to creating diverse polyurethane products.

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