Full definition
A wear-resistant polyurethane (PU) layer applied to metal surfaces by casting, spraying, or bonding pre-formed sheets, providing exceptional fine-particle abrasion resistance in mining, processing, and material handling applications. Hardness: typically 85-95 Shore A (high hardness maximizes sliding abrasion resistance while maintaining adequate elasticity). Thickness: 3-25 mm depending on expected wear life. Application methods: (1) Centrifugal casting — PU liquid is poured into a rotating drum or pipe and cures by centrifugal force against the inner wall; for pipe linings and cylindrical components. (2) Spray coating — two-component fast-setting PU sprayed in layers onto prepared metal; for large, irregular surfaces (chutes, hoppers). (3) Adhesive bonding — pre-cast PU sheets bonded to metal with PU or epoxy adhesive; for field repairs and modular systems. Surface preparation: grit blast to SA 2.5, apply primer within 4 hours. PU coating excels at: fine-particle sliding abrasion (<5 mm particles at <30° impact angle), providing 3-10x the life of rubber and 5-20x the life of steel in these conditions. Limitations: lower impact resistance than NR (PU tears rather than rebounds at high impact angles), temperature limit 80°C, and attacked by hot water. Per mining wear component specifications. Brands: CPI, Argonics (VersaLine), Trelleborg, and polyurethane specialty applicators.