Project Description


Vulcanized bonding is used in a number of applications that require the added stability of metal as well as the flexibility of rubber. In the automotive industry, the technology is used for components such as small mounts for motors and large suspension parts. It is also used for industrial applications such as adhering rubber to metal plates, door seals, hoses, valves, and insulators. Specialized solutions enhance sound-proofing and vibration control.


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The Rubber to Metal Bonding and Molding Process

In general, rubber to metal bonding operations include the following steps:

The materials used in rubber to metal bonding processes are chosen based on the intended application for the end product. If the product will be exposed to extreme temperatures, harsh chemicals, or excessive moisture, the elastomer used must be able to withstand these environmental and operational elements. The appropriate metal should be chosen based on similar characteristics. Standard options for the elastomer include natural rubber and neoprene.

Once the material has been selected, the surface needs to be prepared. To ensure full bonding of the rubber, the metal’s surface needs to be free of oil, rust, and other contaminants. Depending on the state of the metal used, surface preparation might require solvent degreasing, alkaline cleaning, mechanical washing treatments, or other processes.

To prevent contamination, adhesive application begins immediately after surface preparation. Industry-leading LORD adhesive systems feature two layers—a primer and an adhesive topcoat—that are applied sequentially to the metal surface. The metal can be sprayed, dipped, or rolled in the adhesive so long as an even coat is achieved.

The molding process generally involves compression, transfer, or injection molding. The metal is “located” into the mold cavity. While secured in the cavity, the rubber will flow in and around the metal. Under heat and pressure, the rubber and adhesives cure and crosslink. It is important that the metal not sit in the cavity too long before molding as the adhesive can pre-cure and cause failures.

Once the adhesive has fully cured, service providers perform quality assurance tests to ensure the parts meet the specified requirements. Typical tests focus on key parameters, such as tensile strength.

Types of Adhesive Systems for Rubber to Metal Bonding Processes

During the molding stage, the adhesive system allows the rubber material to form a durable bond with the metal part. The types of adhesive systems available include:

In a one-coat system, the adhesive and primer are combined into a single spray that is applied in one step. As the primer step is eliminated, this system can reduce processing time, increase output, and reduce costs. However, it is not as durable or versatile as other adhesive systems.

Separating the primer and adhesive application makes it possible to achieve more advanced characteristics compared to a one-coat process. For instance, two-component adhesives—such as the LORD adhesive system—often offer better corrosion resistance and are less susceptible to water damage or chemical exposures. They also tend to perform better overall, including on measures of dynamic and static fatigue.

These systems are recognized as being safer and more environmentally friendly because they eliminate the use of chemical solvents. This quality also reduces the health risk to employees, lowers the amount of VOCs emitted, and makes them easier to store.

The choice of adhesive system is an important one, and our team can help guide you toward the optimal solution for your application. Our experience working with diverse clients informs our advice, giving us insight into industry-specific requirements and restrictions.


  • Silicone Rubber


  • AEM

  • HNBR

  • EPDM

  • Neoprene

  • Natural Rubber


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Gooodol’s quality ratings are sustained through the implementation of a rigorous quality control system. Part quality is carefully verified through in-process inspection plans where parts are constantly monitored for defects, damage, or any other inconsistencies. A database control number that calls down to the material batch used to produce the part is assigned and recorded for every part made. Every product packaged can then be traced back to the date the part was produced, the processes performed, and the materials employed.

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