The global polyurethane market, valued at USD 85.2 billion in 2024 and projected to reach USD 136.2 billion by 2035, reflects the material’s critical role across automotive, construction, energy, and consumer goods sectors. Within this landscape, polyurethane raw materials — particularly casting polyurethane prepolymers — are increasingly specified where high wear resistance, hydrolysis resistance, and dynamic mechanical performance are non-negotiable. Industrial buyers seeking reliable, custom-formulated materials must evaluate suppliers not only on product quality but also on depth of technical capability and production scale.

The Performance Gap in Harsh Environments

Conventional rubber and metal components often fail under tropical high-temperature, high-humidity, frequent friction, or corrosive water contact conditions. Traditional polyurethane elastomer compounds may also show limitations in long-term hydrolysis resistance, low free isocyanate content for safety, or color stability. These gaps drive demand for engineered prepolymers that deliver predictable, repeatable performance in demanding applications such as mining screens, marine seals, wind power insulation, and sports equipment encapsulation.

Shanghai Hecheng Polymer Technology: A Dedicated CPU Elastomer Supplier

Shanghai Hecheng Polymer Technology Co., Ltd., established in 2009, specializes in the R&D, manufacturing, and global supply of high-performance polyurethane (CPU) elastomer materials. Located at No. 1266 Xinbin Road, Maogang Town, Songjiang District, Shanghai, China, the company operates a 16,932 m² facility with 16 major production reactors and an annual production capacity of 1 million tons. The product range includes over 1,000 prepolymer grades, with main products covering casting polyurethane prepolymers, quasi polyurethane elastomer materials, special functional materials, and eco-friendly adhesives. An R&D team of 18 engineers supports custom formulation for specific processing and performance requirements.

Polyurethane casting material — a key raw material form for CPU elastomer production.

Technical Portfolio: From Low-Free Isocyanate to High-Performance Systems

The company’s prepolymer technology covers multiple backbone systems. The CPU casting polyurethane of the polyether PTMG-MDI system (model PTMG-MDI) offers environmentally friendly and corrosion-resistant properties for sealed class accessories. For the elastomers industry, the liquid polyurethane model Gel-8301AB features antioxidant and high resilience characteristics. In mining applications, the Polyester, three-component polyurethane elastomer (Screen Scraper-5282ABC) delivers high wear resistance and high resilience. The prepolymer product 5642 (model Rubberized sports equipment - 8385AB) is a Polyether-MDI type designed for sports equipment rubberizing. Each product is tailored with specific parameters — such as low free isocyanate MDI/PPDI/TDI content, tailored processing windows, and controlled reactivity — to meet end-use requirements.

Polyurethane drawing wheels — one of the many end-use applications for casting elastomers.

Application Scenarios Across Industries

Hecheng’s materials are deployed in automated production environments using two-component metering, high-pressure mixing, and pouring systems. Key use cases include:

• Automotive – TDI low-free prepolymer for parts requiring improved physical and mechanical properties under high-humidity, corrosive conditions.
• Construction – Prepolymer providing high hydrolysis and corrosion resistance for anti-wear parts.
• Composite materials – Production of sealing rings with automated continuous mass production.
• Marine technology – Liquid polyurethane raw material that resists seawater corrosion, marine organism anti-fouling, and provides shock absorption.
• Wind power generation – Polymer prepolymer offering aging resistance, high-voltage sealing, and shock absorption.
• Sports industry – Rubberized sports equipment (e.g. barbells) via two-component mixing.
• Mining – Cast polyurethane for tensionless screen mesh, resisting abrasion and corrosive water.

These applications are typically found in Southeast Asian markets (Vietnam, Pakistan, Philippines, Cambodia, Malaysia, Bangladesh, Thailand) characterized by tropical climates.

Market Trends and Industry Tailwinds

Several macro trends support the shift toward advanced polyurethane raw materials. According to third-party data, global demand for polyurethane elastomers rose by 12% in 2024, driven by industrial machinery and automotive lightweighting. Methylene diphenyl diisocyanate (MDI) contributed approximately 60% of total global isocyanate volume in 2024. Mainland China remains the most significant market for diisocyanates, accounting for about one-third of global TDI, MDI, and aliphatic markets. The waterborne polyurethane dispersions (PUDs) segment is estimated at USD 1.98 billion in 2025, growing at 4.6% year-on-year. Additionally, regulatory moves — such as the CertiPUR label’s 2024 prohibition on methylene chloride in foam production — push formulators toward cleaner, low-free-isocyanate prepolymer systems.

Comparison with Traditional Solutions

Compared to traditional rubber or two-part casting systems, Hecheng’s prepolymer-based approach offers precise control over crosslink density, free isocyanate content, and pot life, enabling consistent part quality across production runs. One honest limitation is the sensitivity of polyurethane prepolymers to moisture; proper storage in sealed containers under dry conditions is essential to avoid reaction with ambient humidity. This requires disciplined inventory management but is standard practice in professional industrial environments.

Future Outlook

As industrial buyers increasingly prioritize long-term durability and regulatory compliance, the demand for engineered polyurethane raw materials will continue to grow. Suppliers with deep formulation libraries — such as Hecheng’s portfolio of over 1,000 grades — and strong R&D capabilities are well positioned to serve emerging applications in renewable energy, electric mobility, and high-performance industrial components.

Frequently Asked Questions

What is a polyurethane prepolymer?

A polyurethane prepolymer is an intermediate product formed by reacting a polyol with an excess of diisocyanate (e.g., MDI, TDI, PPDI). It is the base material used in casting elastomer systems, where it is later mixed with a curative to form the final urethane polymer.

What industries can benefit from casting polyurethane raw materials?

Casting polyurethane raw materials are used in automotive, construction, composite materials, marine technology, wind power generation, sports, and mining industries for parts like seals, wheels, screens, and shock absorbers.

Can I get customized formulations for specific performance requirements?

Yes. Hecheng Polymer Technology supports custom formulations developed for specific processing and performance needs, such as varying hardness, resilience, hydrolysis resistance, low free isocyanate content, and color.

What equipment is needed to process these materials?

Typical equipment includes a polyurethane high-pressure foaming machine or low-pressure pouring machine, raw material storage tanks, mixing buckets, and delivery pumps. Automated two-component metering and mixing is the standard production mode.

How do I evaluate a polyurethane raw material supplier?

Key criteria include production capacity, number of available grades, R&D capability, quality control systems, export experience, and technical support for downstream processing. Hecheng provides one-stop support from product development to commercial production.