In the rail transit sector, the performance and cost of railway components have always been a focus of industry attention. Traditionally, nylon, due to its excellent mechanical strength and wear resistance, has often been used as an engineering plastic for high-end railway components. However, nylon 6 is expensive and has a high water absorption rate, making it susceptible to environmental influences that lead to dimensional instability. Now, with breakthroughs in material modification technology, modifying ordinary polypropylene with silica (nano-silica) has successfully solved this problem.

By uniformly dispersing nano-sized silica particles in the polypropylene matrix, not only is the material's density significantly improved, but its mechanical properties are also greatly enhanced. The modified polypropylene, in key indicators such as flexural strength, residual compression set, and water resistance, has reached or even surpassed the levels of nylon 6. Simultaneously, the material also possesses superior aging resistance and surface smoothness.

This innovative technology has successfully achieved industrial upgrading by replacing expensive engineering plastics like nylon with cheaper modified polypropylene. This not only significantly reduces the production cost of railway components, but also ensures the high performance and long lifespan of the products, providing a highly competitive solution for the lightweight and economical development of rail transit equipment.