Fillers in a Rubber Compound

Fillers in a Rubber Compound

August 18, 2023 · Neethu Paramewswaran Namboodiri


Ingredients added to a large extent to a rubber compound to increase the ultimate properties (stress-strain, fatigue and abrasion resistance) leading to increased service life, at the same time reducing the compound cost.

Fillers are mainly used in rubber compounding to enhance the physical properties of rubber composites

Fillers are classified into Organic and Inorganic Fillers.

Natural Synthetic Natural Synthetic
  • Inactive
  • Semi-Active
  • Active
  • Inactive
  • Semi-Active
  • Active
  • Inactive
  • Semi-Active
  • Active
  • Inactive
  • Semi-Active
  • Active

Saw Dust

Synthetic Resin
Cellulose Deriv


Carbon Black, Silicas,
Metal Oxides, Metal Salts

Filler classification in relation to activity and reproduction


Rein-forcing Type

Extending Type

Carbon- Black


  • Calcium Carbonate
  • Barium Sulfate
  • Aluminium Trihydrate
  • Talc and Soapstone

Increasing order of particle size:

  • N220(ISAF)
  • N330(HAF)
  • N550(FEF)
  • N762(SRF-LM)
  • N990 (MT)
  • Silica
  • Zinc Oxide
  • Magnesium Carbonate
  • Aluminium Silicate
  • Sodium Aluminosilicate
  • Magnesium Silicate

Function of a Filler:

  • To improve wear and tear characteristics of the vulcanisates (Reinforcing Fillers)
  • Economics of the compound
  • To take care of the processing characteristics of the compound
  • To pertain special properties like Flame Resistance, Electrical Properties etc.
  • To impart colour as required to a compound.


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