Description

Poly(4,4'-Methylenebis(Phenyl Isocyanate)) is a high-performance polymeric isocyanate, commonly known as polymeric MDI (PMDI), which serves as a critical raw material in polyurethane chemistry. Its primary value lies in its ability to form the rigid, cross-linked polymer structures that provide exceptional strength, thermal insulation, and dimensional stability. This product is essential for manufacturers in the construction, automotive, and appliance industries seeking to produce durable, lightweight, and energy-efficient materials.

Application

• Rigid Polyurethane Foam Production: The primary application for manufacturing insulation panels, spray foams, and appliance foams.
• Adhesives & Binders: Used in the formulation of high-strength wood adhesives for oriented strand board (OSB) and particleboard.
• Coatings & Elastomers: A key component in producing durable, chemical-resistant coatings, sealants, and elastomeric materials.
• Automotive Components: Employed in the production of lightweight interior panels, headliners, and sound-dampening materials.
• Construction Materials: Integral to the creation of composite wood products, insulated doors, and structural insulated panels (SIPs).
• Footwear: Used in the manufacture of polyurethane soles and other molded components.

Basic Information

Product Name	Poly(4,4'-Methylenebis(Phenyl Isocyanate))
CAS No.	59595-85-6
Molecular Formula	(C15H10N2O2)n
Molecular Weight	Contact for details
Synonyms	Polymeric MDI; PMDI; Poly(Methylene Diphenyl Diisocyanate); 4,4'-Diphenylmethane Diisocyanate Homopolymer; Poly(MDI); MDI Homopolymer; Isocyanic Acid, Polymethylenepolyphenylene Ester; Crude MDI
EINECS	Contact for details

Quality Control

Our Poly(4,4'-Methylenebis(Phenyl Isocyanate)) is manufactured under stringent process controls to ensure batch-to-batch consistency and high performance. Quality is verified through a comprehensive suite of analytical tests, including NCO content, viscosity, and acidity measurements. Certificates of Analysis (COA) detailing all specifications are provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures recommended for the specific grade (typically between 15°C and 25°C). This material is hygroscopic (moisture-sensitive) and must be kept under a dry, inert atmosphere (e.g., nitrogen blanket) to prevent reaction with atmospheric moisture and carbon dioxide, which can lead to gelation or pressure buildup.

Specification

Item	Specification
Appearance	Brown, viscous liquid
NCO Content	30.0 - 32.0 %
Viscosity (25°C)	150 - 250 mPa·s
Acidity (as HCl)	≤ 0.05 %
Hydrolyzable Chlorine	≤ 0.2 %
Specific Gravity (25°C)	1.22 - 1.25
Flash Point (PMCC)	> 200 °C

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