Full definition
Natural rubber (NR) or NR-blend sheet and lining compound specifically formulated for maximum resistance to abrasive wear from mineral particles in mining chutes, hoppers, cyclones, pipes, and mills. Formulation: high-quality NR polymer (strain-crystallizing for impact resilience), 35-65 Shore A hardness (softer compounds absorb impact energy better — a key NR advantage over harder materials), high carbon black loading (N330/N220 for abrasion resistance), and protective additives. Thickness: 6-50 mm depending on wear severity and expected replacement interval. Abrasion loss: <120 mm³ per DIN 53516 for premium grades; <80 mm³ for ultra-premium. NR outperforms SBR 2-3x and steel 5-10x in impact/gouging abrasion (large particles impacting at >45°) due to its exceptional resilience — energy is absorbed and returned elastically rather than causing plastic deformation or fracture. Limitations: poor resistance to oils and sharp-angle sliding abrasion (<15° — where steel or ceramic is better). Applications: chute and hopper linings, cyclone feeds and overflows, pipe elbows, mill discharge boxes, and conveyor loading zones. Available as: sheet (for adhesive bonding), pre-molded wear tiles, and rubber-backed ceramic composite tiles. Per ISO 14890 for abrasion classification and DIN 53516 for testing.