What are inserts?

Inserts are solid components made of metal, plastic or fabric that are integrated into a rubber component during processing. They serve as reinforcement, fixing points or functional support elements and form the basis for composite parts, particularly in the case of Rubber-metal- or Rubber-plastic compounds.

 

Functions of inserts

Inserted parts are moulded before the moulding process (e.g. Injection moulding, Moulding presses, Transfer Molding) is inserted into the mould. The rubber material encloses the part and cures during the moulding process. Vulcanisation firmly with it. Both the insert and the rubber fulfil a specific task in the composite part depending on their properties. While the rubber provides elasticity, damping, sealing and frictional behaviour, the insert provides structural stability and connection points for the environment.

 

Materials for inserts:

 

To ensure permanent adhesion between the insert and the rubber, additional measures are usually required, such as the application of Adhesion promoters (primer) and surface pre-treatments (e.g. Degreasing, sandblasting) is necessary.

 

Application of inserts

Inserts can be found in numerous technical products:

  • Rubber-Metal Composite Parts such as engine mounts, vibration dampers, silent blocks
  • Seals with embedded (fabric) carriers
  • Composite parts with threaded inserts
  • Grommets, protective housing and rubber bushes
  • Hydraulic and pneumatic seals

They enable compact components with multifunctional properties that are both elastic and structurally resilient.