Kagevest 25

Chemical name: Butadiene, homopolymeric, trimethoxysilyl modified (silane-modified liquid polybutadiene)

CAS Number: 71010-70-3

Kagevest 25 is a polymeric organo-silicon filler activator for rubber compounds.

Material Definition

Appearance: Colourless/light yellow liquid

Odour: Weak characteristic odour

Ignition Temperature: Approx. 110°C (DIN 51758)

Melting Point: < - 30°C (solidification point)

Explosion limits: Approx. 350°C (DIN 51794) No explosion limits under normal conditions

Density (20°C): 0.95 g/cm3

Solubility: Water insoluble; Soluble in all plasticizers and solvents commonly used for rubber processing

Viscosity (20°C): Approx. 2000 mPas

Stability: No decomposition up to 250°C


Polymeric organosilicon filler activator for rubber compounds. Through the use of Kagevest, a substantial enhancement of the reinforcing action of light-coloured filler materials can be achieved. Kagevest is active with both sulphur and peroxides in the cross-linking of compounds containing silicic acid and silicate fillers.

Mechanism of action: Polymeric organosilicon containing reactive trimethoxysilyl groups which react with the surface of light-coloured reinforcing filler materials, while the unsaturated polymer chain is incorporated in the cross-linked structure of the vulcanized rubber.

Technical benefits:

  • substantially reduced vulcanization time

  • reduced elongation set and permanent compression set

  • lower viscosity of green compounds

  • higher tensile strength and modulus as well as tear propagation strength

  • improved abrasion resistance and enhanced properties under dynamic conditions

  • reduced water absorption

    Handling, Storage and Packaging

    If stored in the unopened original container in a dry place, the shelf life of the product is at least one year.

    Standard pack size are drums of 180 kg.

    Regulatory Information

    EU REACH registered: Not applicable


  • Americas (United States, Canada, South America)
  • APAC (Asia-Pacific)
  • ANZ (Australia, New Zealand)
  • EU (European Union)
  • PRC (People's Republic of China)
  • UK (United Kingdom)
  • Disclaimer / Conditions

    Revision: 2018-12-14 / 74d8

    We strive to be accurate in all of our documentation. However, any information or advice is provided by us in good faith, without warranty or unlimited claim of fitness for a specific application. We sell to qualified industrial users only. The onus is on the product's user to research carefully and then to continually test the product and its application procedures within the context of its specific use. Use of our products and data requires diligance and care, and is within the sole responsibility of the user. Kautschuk-Group does not accept any liability for damages incurred. Our general Terms and Conditions apply.

    Stated storage and shelf life times are minimum guaranteed values for a period starting on the day of shipment. After this period has expired, the product requires additional quality control testing but may very well still be within specification. For more information, refer to our Shelf Life Policy.

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