Rubber to Metal Bonding Process

Flexan handles the entire process of rubber to metal bonding, or insert molding, from developing the rubber compound and adding chemical bonding agents to procuring and preparing the metal inserts to bonding and finishing. For complex inserts, Flexan develops a mold design that will locate, orient, and hold the insert in the exact position throughout the molding cycle. When rubber to metal bonding is done correctly, the bond will be physically stronger than the material. This means that the rubber bonded to metal will tear before the bond fails. Insert molding is an excellent technique for adding strength and stability to rubber bonded to metal.

Chemical Bonding

Our engineers and chemists work to improve the quality of the bond through various steps, such as:

  • Degreasing and cleaning
  • Abrading
  • Chemical etching
  • Applying a bonding agent or adhesive


  • Hydraulics and pneumatics
  • Automotive and heavy truck
  • Medical devices

Some of the metal insert materials Flexan works with are:

  • Steel
    • 430FR
    • 17-7 PH
    • 17-4 PH
    • 304
    • 303
    • 330
    • 26-1
    • 4140
    • AISI 1050
    • Cold rolled steel
    • AISI 420B
    • E-1050
  • Brass
    • C646
    • 36000 HO2
  • Aluminum
    • 2017-T4
    • 2011-T3
    • 5052-432

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