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Vulcanisation Activators

Vulcanisation activators are products which have a strong activation effect on the cross linking reactions of diene rubbers. The vulcanisation speed is enhanced, and the cross-link density and reversion resistance are increased, particularly when used in high doses. In most cases the dynamic properties of the vulcanised products are clearly improved. Furthermore, additives like Struktol Aktivator 73 A or Struktol ZEH can either supplement or completely replace the use of stearic acid, without running the risk of increased bloom.

Struktol® Aktivator 50
  • Zinc salt
  • Pale-yellow liquid

Packaging: 200 kg drums
Density: 1180 kg/m³
Viscosity at 20 °C: 7000 mPa*s
Dosage: 3 - 7 phr

  • Efficient cure activator, can replace stearic acid and zinc oxide leading to lower compression set and improved reversion resistance
  • Reduced stress relaxation and creep
  • Improved dynamic properties
  • Improves building tack
Struktol® Aktivator 50-75
  • Zinc salt
  • Light yellow powder (75 % active substance)

Packaging: 20 kg bags
Density: 1300 kg/m³
Dosage: 3 - 7 phr

  • Efficient cure activator, can replace stearic acid and zinc oxide leading to lower compression set and improved reversion resistance
  • Reduced stress relaxation and creep
  • Improved dynamic properties
  • Improves building tack
Struktol® Aktivator 70
  • Zinc salt
  • Cream coloured pastilles

Packaging: 20 kg bags
Density: 1010 kg/m³
Melting point: 105 °C
Dosage: 2 - 7 phr

  • Efficient cure activator, dispersing additive and lubricant.
  • Effective in highly loaded compounds based on silica or carbon black where filler dispersion and state of cure can be increased
Struktol® Aktivator 73
  • Blend of zinc salts
  • Cream coloured pastilles

Packaging: 20 kg bags
Density: 1200 kg/m³
Melting point: 95 °C
Dosage: 2 - 4 phr

  • Improves reversion resistance
  • Lower heat build-up during dynamic loading
  • Reduces compression set at higher temperature
Struktol® Aktivator 73 A
  • Blend of zinc salts
  • Light grey pastilles

Packaging: 20 kg bags
Density: 1200 kg/m³
Melting point: 112 °C
Zinc Content: 16.3 %
Dosage: 2 - 4 phr, in combination with 3 - 5 phr ZnO

  • Strong activation with clear increase of modulus values
  • Improves reversion resistance
  • Lower heat build-up during dynamic loading
  • Reduces compression set at higher temperature
  • Can supplant the use of stearic acid and reduce dependence on ZnO
Struktol® Aktivator 74
  • Blend of zinc salts
  • Beige to brown pastilles

Packaging: 20 kg bags
Density: 1100 kg/m³
Melting point: 100 °C
Dosage: 3 - 5 phr

  • Cure activation additive for increased reversion stability
  • Can partly replace common fatty acid based activators
  • Processibilty, especially compound flow is enhanced
  • Dispersing and activating effect within NR silica filled compounds
Struktol® ZB 47
  • Blend of zinc salts
  • Cream coloured pastilles

Packaging: 25 kg bags
Density: 1060 kg/m³
Melting point: 108 °C
Dosage: 3 - 5 phr

  • Cure activator for sulphur cured systems
  • Offers heat stability (reversion resistance) and improves dynamic properties
  • For NR compounds containing mineral filler
Struktol® ZEH
  • Zinc-2-ethylhexanoate
  • Light yellow liquid

Packaging: 200 kg drums
Density: 1180 kg/m³
Viscosity at 25 °C: <7000 mPa*s
Dosage: 3 - 5 phr

  • Reduces stress relaxation and creep
  • Particularly effective as component in soluble EV systems
  • Improves dynamic properties
  • Reduces compression set at low temperatures
  • Improves building tack
Struktol® ZEH-DL
  • Zinc-2-ethylhexanoate
  • Light yellow powder (67 % active substance)

Packaging: 20 kg Säcke
Density: 1400 kg/m³
Dosage: 3 – 6 phr

  • Reduces stress relaxation and creep
  • Particularly effective as component in soluble EV systems
  • Improves dynamic properties
  • Reduces compression set at low temperatures
  • Improves building tack
Struktol® ZEH 75
  • Zinc-2-ethylhexanoate
  • Light yellow powder (75 % active substance)

Packaging: 20 kg Säcke
Density: 1300 kg/m³
Dosage: 3 – 6 phr

  • Reduces stress relaxation and creep
  • Particularly effective as component in soluble EV systems
  • Improves dynamic properties
  • Reduces compression set at low temperatures
  • Improves building tack
Struktol® IB 531
  • Ammonium salts of alkanolamines, bound to silica
  • Cream free flowing powder

Packaging: 20 kg bags
Density: 1500 kg/m³
Dosage: 0.5 - 2 phr

  • Promoter for conventional sulphur cross-linking systems
  • Filler activator for highly reinforcing white fillers
  • Increased cure activiation leading to shorter cure time without loss of scorch safety
  • Particularly effective as replacement for secondary accelerators
  • Designed for successful use in injection and transfer moulding processes and in continuous vulcanisation