Full definition
Cast or millable polyurethane elastomer providing the highest mechanical properties of any rubber: exceptional abrasion resistance (3-10x natural rubber in sliding wear), highest tensile strength (30-70 MPa), outstanding tear resistance, and very high load-bearing capacity with low compression set. Two chemical families: AU (polyester-based — superior abrasion and oil resistance) and EU (polyether-based — better hydrolysis and microbial resistance). Hardness range: 20 Shore A to 75 Shore D. Temperature range: -30 to +80°C continuous (main limitation). Per ASTM D2000 classification: BG. Processing: typically cast from liquid systems (prepolymer + curative, TDI/MDI-based), cured at 80-110°C, post-cured at 100°C for 16-24 hours. Applications: conveyor belt scrapers, mining screen panels, industrial wheels and rollers (forklift wheels, crane wheels), hydraulic seals and wipers, metal-forming pads, pipeline pigs, and abrasion-resistant linings. Limitations: degrades above 80°C, attacked by hot water/steam, poor UV resistance. Brands: Vulkollan (Covestro — premium for wheels), Adiprene (Lanxess), Vibrathane (Chemtura).