01 Brake Hose

Brake hoses are important safety components of vehicles, and their quality and stability are highly demanding. The rubber in the inner and outer layers of brake hoses is usually made of EPDM rubber, and the reinforcement layer is mostly made of polyester fiber or aramid fiber.

Brake hoses have extremely strict requirements for expansion deformation under high-pressure conditions, and the high strength and high modulus characteristics of aramid fibers can fully meet the requirements for low deformation.

02 Power steering hoses

The power steering hoses of a car are divided into hoses for hydraulic steering systems and hoses for electronic steering systems. The medium in contact with traditional hydraulic steering hoses is mineral oil, which requires good high-temperature resistance and no leakage, with a maximum operating temperature of up to 150°C.

The reinforcement layer material of hydraulic steering hoses can use Nylon 66 fiber and aramid fiber, among others. New types of automotive power steering systems increasingly use electronic steering systems. This system does not require a high-pressure pump or steering fluid, nor does it require hose connections.

03 Cooling system hoses

Automobile cooling system hoses connect the engine and radiator, transferring heat through the coolant. They can be divided into radiator hoses (high temperature resistant) and heater hoses (high temperature resistant and resistant to pulsating vibrations). The normal operating water temperature is 125 ℃.

The reinforcement materials of cooling system hoses are mainly para-aramid fibers and polyester fibers. Typically, para-aramid fibers, such as Teijin Aramid's Twaron® series and DuPont's Kevlar® series, have better heat resistance and can operate continuously at 160 ℃. In addition, Teijin Aramid's Technora® series aramid can withstand higher temperatures, with a long-term operating temperature of up to 190 ℃.

04 Air Conditioning System Hoses

The earliest refrigerant used in automotive air conditioning systems was Freon. Because Freon can damage the ozone layer, China completely banned its use after 2000. The refrigerant currently in use is R134a.

The hoses in these air conditioning systems typically use nylon as the barrier layer material. The outer rubber layer is made of EPDM (ethylene propylene diene monomer) rubber, while the intermediate reinforcement layer is made of polyester fiber or polyvinyl alcohol-aldehyde (vinylon) fiber, with a small amount of aramid fiber also used. Among these, polyester fiber is the most widely applied in China.

05 Turbocharged Hoses

Turbocharger hoses are generally divided into high-temperature section hoses and low-temperature section hoses after passing through the intercooler. The high-temperature section hoses operate at higher temperatures, typically reaching 210 ℃, which ordinary reinforcement materials (such as polyester fiber and nylon fiber) cannot withstand at all.

06 Fuel hoses

Turbocharger hoses are generally divided into high-temperature section hoses and low-temperature section hoses after passing through the intercooler. The high-temperature section hoses operate at higher temperatures, typically reaching 210 °C, which ordinary reinforcement materials (such as polyester fiber and nylon fiber) cannot withstand at all.

Traditional fuel hoses use a structure of inner rubber layer - reinforcing layer - outer rubber layer, with fiber reinforcing layers added between rubber layers through winding or braiding processes. The maximum operating temperature of fuel hoses can reach 130°C. Therefore, many fuel hoses use aramid fiber reinforcing layers with good high-temperature resistance and low elongation.

07 Intake and exhaust system hoses

The assembly of components that directs air or a mixture of gases into an engine cylinder is called the engine intake system. The automobile exhaust system mainly discharges the exhaust gases produced by the engine during operation, while also reducing the pollution and noise of the discharged gases.