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Polyurethane lining is a high-performance protective layer onto metal substrates. Our company has specialized in this technology since 2002, evolving from a rubber products manufacturer to a leading supplier of wear-resistant solutions for the mining and mineral processing. With state‑of‑the‑art production equipment, rigorous quality control, and decades of application expertise, we deliver polyurethane linings that significantly extend equipment service life, reduce downtime, and improve operational efficiency.
Polyurethane elastomers possess a unique molecular structure that combines the elasticity of rubber with the strength and toughness of engineering plastics. This synergy makes them an ideal lining material for severe service conditions.
The abrasion resistance of polyurethane lining is 10 to 100 times higher than that of ordinary carbon steel. In many mining applications, polyurethane liners outlast high‑chromium cast iron by a factor of four or more. Compared to conventional natural rubber, polyurethane exhibits 3 to 5 times better wear resistance. This outstanding performance is attributed to the material’s high tear strength and its ability to deform elastically under stress, distributing energy and reducing surface removal.
When heavy or sharp materials strike the lining surface, the elastic polyurethane layer compresses and immediately rebounds after the impact. This “soft‑against‑hard” mechanism effectively absorbs impact energy, protecting the underlying metal structure from deformation and fatigue cracking. This property is particularly valuable in applications with large lump sizes or high‑drop heights.
Polyurethane linings exhibit good resistance to acids, alkalis, oils, and many organic solvents. Additionally, specially formulated grades offer outstanding hydrolysis resistance, ensuring stable performance in wet environments, such as mineral slurry handling and underwater operations. This chemical durability reduces the need for frequent replacements caused by corrosive attack.
The low surface energy and anti‑static characteristics of polyurethane prevent fine particles from adhering to the lining surface. This self‑cleaning effect is critical when conveying sticky ores, concentrates, or filter cakes. It dramatically reduces manual cleaning intervals and the associated production losses.
Polyurethane has inherent sound‑absorbing and vibration‑damping properties. Equipment fitted with polyurethane linings operates more quietly, contributing to a safer and more comfortable working environment and meeting modern occupational health standards.
Our polyurethane lining products are engineered to suit a wide range of equipment and process stages. The main application areas include:
Hydrocyclones used in classification, desliming, and thickening benefit from polyurethane liners that resist both abrasive wear and chemical attack. The smooth inner surface ensures accurate separation efficiency while extending cone and spigot life by several times compared to ceramic or metallic alternatives.
Material handling systems often suffer from severe sliding wear and build‑up at transfer points. Polyurethane liners effectively eliminate sticking problems and withstand the continuous abrasion from coarse ore or coal, reducing maintenance costs and improving material flow.
The rotors and stators in flotation cells are critical for air dispersion and slurry mixing. Polyurethane‑coated parts not only resist wear from abrasive pulp but also maintain precise dimensional tolerances, ensuring consistent flotation performance over extended periods.
To meet diverse customer requirements – from high‑volume production to rapid prototyping – we operate two independently configured polyurethane casting machines. This dual‑unit setup provides unparalleled flexibility and efficiency.
Optimized for maximum output, this unit delivers a metered flow rate of 15 to 30 kg per minute. It is specifically designed for the economical manufacturing of large components，as well as sustaining continuous production runs for established product lines. The high throughput ensures short lead times and consistent quality for repeat orders.
Focused on flexibility and accuracy, this unit operates at a lower output range of 1 to 5 kg per minute. It is ideal for rapid prototyping, small‑batch production of specialized parts, and the creation of complex, tailor‑made geometries. With no minimum order quantity constraints, Unit B enables us to collaborate with R&D departments and support pilot‑scale trials. Its precise metering system guarantees exact formulation and minimal material waste.
Both units are fully compatible with MDI (diphenylmethane diisocyanate) and TDI (toluene diisocyanate) based polyurethane systems. This dual‑system capability allows us to select the most appropriate isocyanate chemistry for each application:
- MDI systems provide higher strength, greater heat resistance, and superior load‑bearing capacity – ideal for heavy‑duty applications where high compressive forces are encountered.
- TDI systems offer excellent dynamic properties, higher tear strength, and better low‑temperature flexibility – perfect for high‑impact, high‑wear environments.
By matching the formulation to the specific service conditions, we maximize liner longevity and performance.
We implement a comprehensive quality management system covering every stage from raw material incoming inspection to final product release.
- Raw Material Control – All isocyanates, polyols, curatives, and fillers are sourced from certified suppliers and tested for purity, viscosity, and reactivity before use.
- In‑Process Monitoring – During casting, temperature, mixing ratio, and degassing are continuously monitored to ensure defect‑free parts.
- Post‑Curing and Machining – After demolding, components undergo controlled post‑curing to achieve optimum mechanical properties. CNC machining centers and large hydraulic vulcanizing presses finish the parts to precise dimensions.
- Mechanical Testing – Samples from each batch are tested for hardness (Shore A/D), tensile strength, elongation, tear resistance, abrasion loss (DIN or ASTM), and rebound resilience. Special tests for hydrolysis resistance or flame retardancy are performed upon request.
- Dimensional Inspection – Critical dimensions are verified using coordinate measuring machines (CMM) and laser scanners, ensuring perfect fit with the customer’s equipment.
Our commitment to quality is backed by decades of field experience and continuous feedback from global customers. We regularly update our process parameters to incorporate the latest material developments.
Our products are exported to more than 20 countries, including Russia, Germany, the United States, Kazakhstan, Spain, Brazil, Chile, and Australia. We work closely with local distributors and engineering firms to provide on‑site technical support, installation guidance, and failure analysis. Our team of application engineers assists customers in selecting the right polymer grade and lining thickness for their specific operating conditions.
We also offer custom design services for non‑standard equipment – using 3D scanning and finite element analysis (FEA) to optimize liner geometry and fixation methods. This holistic approach ensures that our polyurethane linings not only protect equipment but also contribute to overall process efficiency.
By extending the replacement interval of wear‑resistant components, polyurethane linings reduce material consumption and waste generation. Longer service life translates directly into lower lifecycle costs – despite a higher initial investment compared to conventional steel or rubber liners. Additionally, the reduced weight of polyurethane linings (approximately one‑sixth the density of steel) lowers handling costs and eases installation, saving both time and labor.
Polyurethane lining stands as a proven, versatile, and cost‑effective solution for combating abrasion, corrosion, and impact in the mineral processing. Our company’s deep expertise in polymer chemistry, combined with our advanced dual‑casting‑machine facility (Unit A for high throughput and Unit B for precision and agility), enables us to serve every market segment from large‑scale mines to specialized engineering workshops. With a firm commitment to quality, innovation, and customer partnership, we continue to lead the industry in polyurethane lining technology – driving operational excellence and sustainable development for mineral processing operations worldwide.