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Automotive rubber hoses play a vital role in the smooth operation of your vehicle, ensuring the efficient transfer of fluids such as coolant, air and fuel. Their durability and performance are critical to keeping the engine running optimally and ensuring driver safety. This article takes an in-depth look at the complex manufacturing process of automotive rubber hoses, outlining in detail the steps involved in transforming raw materials into high-quality components.

8 steps of auto rubber hose manufacturing process

Material selection and preparation: the foundation of quality

Automotive rubber hose used in the rubber material mainly includes synthetic rubber, natural rubber, nitrile rubber, etc., these raw materials need to be mixed, plus sulfur, active agent and other various additives to form a finished rubber material. Mixing is mainly to disperse the raw materials evenly, so that the additives can be fully combined to form a high-quality rubber compound.

Extrusion: shaping the core of the hose

Extrusion is the process of molding the rubber compound into the desired hose shape. The prepared rubber compound is fed into an extruder, which forces the material through a molding die. The die determines the cross-sectional profile of the hose, which can vary depending on the application.

During the extrusion process, the rubber compound is subjected to heat and pressure, causing it to flow through the die and form a continuous tube. The extruded hose is then cooled and passed through a sizing die to ensure consistent dimensions. This process leads to the formation of the inner tube of the hose, which is the core component for transporting the fluid.

Reinforcement: increasing strength and durability

Automotive rubber hoses often need to be reinforced to withstand the pressures and forces encountered during vehicle operation. A reinforcement layer is added to the inner hose to increase its strength, durability and resistance to expansion.

Reinforcement materials can vary depending on the specific application. Common reinforcement materials include textile cord (e.g. polyester or rayon) and steel wire. These materials are typically applied in multiple layers, with each layer oriented at a different angle to provide multi-directional reinforcement.

Reinforcement layers are typically applied using a variety of techniques, including calendering, winding or braiding. Calendering involves pressing the reinforcing material onto the rubber tube, while winding involves spiraling the material around the tube. Braiding involves intricately weaving the reinforcement around the tube to provide a high level of strength and flexibility.

Vulcanization: transforming into a durable hose

Vulcanization is the process of cross-linking rubber molecules, transforming the rubber compound into a durable and flexible material. This critical step ensures that the hose can withstand the rigors of automotive use.

Vulcanization is usually achieved by exposing the hose to high temperatures and often involves the use of sulfur or other vulcanizing agents. The heat and vulcanizing agent cause the rubber molecules to form covalent bonds, creating a three-dimensional network that gives the hose its strength and elasticity.

The vulcanization process is carefully controlled to achieve the desired level of cross-linking. Excessive cross-linking results in a hard and brittle hose, while insufficient cross-linking results in a weak and pliable hose that may not be able to withstand the required pressure.


Molding is the process of pressing the vulcanized rubber compound through a mold into the desired hose shape. The pressed formations, sizes and shapes need to be customized to suit different automotive needs. Parameters such as pressure and temperature need to be controlled during the molding process to ensure the production quality of the hose.


The last part of hose production is post-processing, which mainly includes trimming, polishing and cutting. These steps can make the appearance of the hose more beautiful, more accurate size, and can detect potential defects to ensure the quality of the product.

rubber hoses
rubber hoses

Testing and quality control: ensuring reliability and safety

Before automotive rubber hoses are put into service, they undergo rigorous testing and quality control procedures to ensure that they meet the strict standards set by the automotive industry. These tests evaluate all aspects of hose performance, including:
Pressure testing: hoses are subjected to high pressures to ensure they can withstand the working pressures encountered in vehicles.
Temperature testing: Hoses are exposed to extreme temperatures to verify their ability to maintain integrity and performance under varying conditions.
Permeability testing: Hoses are tested for fluid leakage resistance to ensure they are effective at retaining fluids without allowing them to escape.
Durability testing: Hoses are subjected to a variety of stress and fatigue tests to simulate the conditions they encounter during vehicle operation.
These comprehensive tests help ensure that automotive rubber hoses meet the most stringent standards of demanding quality, reliability and safety.

Final touches and packaging: ready for the road

Once the hose has passed all quality control checks, final finishing touches are applied. These may include trimming excess material, applying protective coatings or adding markings for identification and traceability.

The finished hose is then carefully packaged to prevent damage during transportation and storage. Packaging materials are chosen to ensure that the hose is protected from moisture, dust and physical effects.



In conclusion, the production process of automotive hose is a complex process that requires a variety of processes and equipment to complete. It not only requires precise control of the production process, but also ensures the purity of the rubber material, the stability of the material and other requirements to ensure that the final product has high quality and stability.