Railroad Synthetic Sleepers also called Polymer Railroad Ties, also known as composite sleepers or polymer sleepers, are made of a composite material sheet produced by a foam extrusion process with continuous reinforced glass fiber (Fiber-reinforced Foamed Urethane), mixed with polyurethane, supplemented with additives. Compared with concrete sleepers, wooden sleepers, steel sleepers, plastic sleepers, it has many advantages, such as light in weight, good insulating and more than 50 years in service life, high heat-insulating, good chemical-resistant, very low maintenance costs, etc.
