Structure

• Generally, it consists of an inner rubber layer, a reinforcement layer, and an outer rubber layer.
• The inner rubber layer is in direct contact with the coolant and must have good corrosion resistance and water resistance.
• The reinforcement layer, usually made of steel wire braiding or fiber braiding, is used to enhance the hose's strength and pressure resistance, enabling it to withstand pressure and temperature changes in the cooling system.
• The outer rubber layer plays a protective role, preventing damage to the inner layers and the reinforcement layer from external factors, while also featuring aging resistance and wear resistance.

Materials

• Ethylene Propylene Diene Monomer (EPDM): It has excellent heat resistance, cold resistance, ozone resistance, ultraviolet resistance, water resistance, and chemical stability. Additionally, it boasts outstanding elasticity and aging resistance, ensuring that the hose maintains good flexibility and sealing performance during long-term use. It is one of the commonly used materials for engine cooling hoses.
• Polyolefin: It offers good heat resistance, chemical corrosion resistance, and mechanical properties, and performs stably in high-pressure and high-temperature environments. It is suitable for cooling systems that need to withstand significant pressure and temperature changes.
• Polyurethane (PU): Hoses made of polyurethane have good wear resistance, elasticity, and tear resistance. They are typically used in areas within the engine compartment with complex layouts that need to withstand large mechanical stresses.