Websites and locations
  • Product

Vultac® are sulfur donors and vulcanization agents for rubbers

Discover the Product range Alkylphenol disulfide.
CAS : 68555-98-6 / 60303-68-6
Product overview
Vultac® are sulfur donors and vulcanization agents for rubbers with antioxidant and tackifying properties due to their chemical structure.
Supplied by MLPC International, Vultac® grades are low molecular weight alkylphenol disulfide oligomers that contain between 20-31.5% of sulfur.
Geographic availability
  • Worldwide

Vultac®, a chemically unique cross-linker and sulfur donor

Vultac® products are polymeric alkylphenoldisulfides, commonly used as nitrosamine-free curing agents. Vultac® acts both as sulfur donor and cross-linker in rubber compositions. With a distinctive combination of benefits, Vultac® products enable formulators to decrease their formulation costs while improving the performance of the finished articles.

Vultac® products act as special cross-linkers, forming both hybrid and traditional sulfur bridges, as shown in the figure. The hybrid bonds are composed of alkylphenol groups linked to the rubber chains by monosulfidic or disulfidic bridges.

Benefits and features of Vultac®

In rubbers, Vultac®  grades as curing agents offer the advantages of:

  • Thermal stability leading to better reversion and heat ageing resistance.
  • A relative long hybrid cross-link, providing a better molecular flexibility and thus improving mechanical and dynamic properties

Others key benefits

  • Non-blooming
  • Non-staining
  • Tackifier enhancing adhesion
  • Anti-oxidant behaviour
  • Co-vulcanization

Vultac® products are particularly recommended in halobutyl rubber (CIIR, BIIR, BIMS) applications, but have been used successfully also in a wide range of rubber formulations, including IIR, EPDM, NR, SBR and NBR.


Automotive rubber applications :

  • Tire innerliner
  • Tread for green tire
  • Sidewall for tire
  • Profiles
  • Damping blocks and motor mounts
  • Shoulder, chafer and apex
  • Solid tires
  • Inner tubes

Industrial rubbers

  • Elastic threads
  • Halobutyl rubbers
  • Shoe sole
  • Adhesives/Tapes

Related products

Rosinox® for rosin bleaching
  • Product
Rosinox® is a bleaching agent and catalyst for disproportionation of rosin and rosin esters. Supplied by MLPC International, ...