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We've had our FKM Crumb under an Electron Microscope! some great pics:
11:16am Jan 27


In general, fillers are materials that are added to rubber compounds to modify the properties or costs.

They fall into two main types:

1. Reinforcing fillers:

  • Carbon black.
  • Silica/Silicate.

Reinforcing fillers will increase tensile strength, modulus and abrasion resistance of the rubber. The finer the particle the greater the effect.

2. Non-reinforcing mineral fillers:

They will not improve the physical properties of the rubber, and are often used just to reduce the material cost. Non-reinforcing fillers are also useful when you are trying to reduce the "rubberiness" of the material, to reduce resilience, mould shrinkage, increase density etc.