Description

Polyurethane Prepolymer CAS NO 103837-45-2 is a reactive intermediate based on isocyanate chemistry, designed for the formulation of high-performance polyurethane systems. This prepolymer is critical for achieving superior mechanical properties, chemical resistance, and durability in the final cured elastomer or adhesive. It is an essential raw material for manufacturers in the automotive, construction, industrial coatings, and footwear sectors seeking to enhance product performance and reliability.

Application

• High-Performance Elastomers: Used in the production of cast polyurethane parts for industrial rollers, wheels, and seals requiring excellent abrasion resistance and load-bearing capacity.
• Adhesives & Sealants: Serves as a key component in formulating moisture-curing polyurethane adhesives for bonding substrates like metals, plastics, and composites in construction and assembly.
• Waterproof Coatings: A vital ingredient in creating durable, flexible, and waterproof membranes and coatings for roofing, flooring, and infrastructure protection.
• Footwear Manufacturing: Employed in the production of high-quality, durable, and comfortable shoe soles and components.
• Automotive Components: Used to manufacture bushings, gaskets, and other under-the-hood parts that demand oil and fuel resistance.
• Industrial Rollers & Wheels: Formulated into polyurethane systems for creating rollers with superior rebound, noise dampening, and wear characteristics.

Basic Information

Product Name	Polyurethane Prepolymer
CAS No.	103837-45-2
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Isocyanate-terminated prepolymer; MDI-based prepolymer; Polyurethane pre-polymer; Polyisocyanate prepolymer; Urethane prepolymer; 4,4'-Methylenediphenyl diisocyanate prepolymer; Reactive polyurethane intermediate; PU prepolymer
EINECS	Contact for details

Quality Control

Our Polyurethane Prepolymer is manufactured under strict process controls to ensure batch-to-batch consistency and performance reliability. Quality is verified through a series of analytical tests including isocyanate (NCO) content, viscosity, and moisture analysis. Certificates of Analysis (COA) documenting all key parameters are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed, moisture-proof container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures recommended for the specific grade (typically between 15-25°C). This product is hygroscopic (moisture-sensitive). Prolonged exposure to atmospheric moisture will lead to reaction and viscosity increase. Use dry, inert gas (e.g., nitrogen) for blanketing opened containers to maintain product integrity.

Specification

Item	Specification
Appearance	Clear, pale yellow to amber liquid
NCO Content	As per grade (Contact for details)
Viscosity @ 25°C	As per grade (Contact for details)
Moisture Content	< 0.05%
Specific Gravity @ 25°C	~1.15 - 1.25

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