Full definition
Mining-grade neoprene, also known as polychloroprene (CR), is specifically engineered to withstand the harsh environments encountered in mining operations. It is designed to resist high abrasion from sharp mineral particles, making it ideal for applications where wear and tear are significant concerns. The compound features a unique formulation that combines high natural rubber (NR) content for enhanced abrasion resistance and CR for its chemical and flame-resistant properties, meeting the rigorous standards necessary for underground mining. This blend is fortified with high carbon black loading, which provides additional protection against abrasion, and includes antiozonants and flame retardant additives to comply with safety regulations such as MSHA (Mine Safety and Health Administration) and ISO 340, which relates to the flammability of rubber materials used in mines.
The hardness of mining-grade neoprene typically ranges from 55 to 70 Shore A, which indicates its flexibility and resilience under pressure. Its abrasion resistance is quantified at less than 150 mm³ when measured by the DIN method, making it suitable for various demanding applications. This material is extensively used in chute and hopper linings to protect steel from abrasive ore, conveyor skirting, screen deck protection, pump linings, and chemical-resistant gaskets. Additionally, it is used for hose covers in process water and slurry applications, as well as expansion joints in process piping.
While mining-grade CR offers a cost-effective alternative with a balance between the superior abrasion resistance of NR and the chemical/flame resistance of CR, it is essential to recognize its limits. In scenarios requiring extreme abrasion resistance, polyurethane (PU) may outperform CR by three to five times; however, PU comes with a higher price tag—two to three times more expensive. For applications dealing with extreme chemicals, alternatives such as fluorocarbon elastomers (FKM) or PTFE-lined materials might be necessary to ensure optimal performance. Choosing the right material should always align with mine operator and OEM specifications to ensure safety and efficiency in operations.