Importance of rubber air intake hose material selection and compatibility with transmission media

In various industrial applications, automobile manufacturing, medical equipment and daily life, rubber air intake hoses are key components for connecting and transmitting fluids or gases, and their performance and safety are crucial. The structural design of rubber air intake hoses is complex and diverse, but without exception, the core functional part, that is, the inner layer that is in direct contact with the transmission medium, the material selection is directly related to the transmission efficiency of the medium, the stable operation of the system and the safety of the environment.

Basic principles for rubber air intake hose material selection
The selection of rubber air intake hose materials is not arbitrary, but based on a series of rigorous considerations. The first principle is material compatibility, that is, the rubber air intake hose material must be chemically compatible with the transmission medium to avoid degradation or even failure of the rubber air intake hose due to corrosion, swelling or degradation of the medium. In addition, the temperature resistance, pressure resistance, wear resistance, aging resistance of the material and whether it meets specific industry standards or regulatory requirements must also be considered.

Selection of inner rubber layer materials for rubber intake rubber air intake hoses
In the intake system, the rubber air intake hose not only has to withstand pressure fluctuations from the engine, but also has to face the erosion of various media such as fuel vapor, engine oil, coolant, etc. Therefore, the selection of inner rubber layer materials is particularly critical. Rubber is the first choice for the inner layer material of the intake rubber air intake hose due to its good elasticity, sealing and chemical stability.

Nitrile rubber (NBR): As a polar rubber, NBR is widely used in oil medium transmission systems due to its excellent oil resistance, solvent resistance and certain heat resistance. It can effectively resist the erosion of hydrocarbon substances such as fuel and engine oil, and maintain the integrity and sealing performance of the rubber air intake hose structure. At the same time, NBR also has a certain wear resistance, which prolongs the service life of the rubber air intake hose. However, it should be noted that the performance of NBR will decrease under extremely high temperature or strong oxidant environment.
Ethylene propylene rubber (EPDM): EPDM is known for its excellent weather resistance, ozone resistance and wide operating temperature range. It can not only resist the erosion of most chemicals (except strong acids and alkalis), but also maintain good elasticity in high and low temperature environments. It is an ideal material for automotive intake systems, cooling systems and many outdoor applications. EPDM is particularly resistant to aging, and its physical properties and sealing effect can be maintained even in long-term use in harsh outdoor environments.
Material sealing and anti-leakage mechanism
Whether it is NBR or EPDM, the key to these materials’ ability to effectively prevent gas leakage is that they can form a tight, continuous inner membrane, effectively isolating the transmission medium from the external environment. Through a precise extrusion process, these rubber materials can form a non-porous, uniform inner surface, reducing the possibility of medium penetration. At the same time, the high elasticity of the rubber allows the rubber air intake hose to quickly return to its original shape when subjected to pressure changes, maintaining close contact at the sealing interface and further preventing gas or liquid leakage.