Application Characteristics of Crosslinking Peroxides
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Application Characteristics of Crosslinking Peroxides

Advantages of peroxide crosslinking in comparison with sulfur cure

  • Simple formulation
  • Storage of the peroxide-containing compound without bin scorch
  • High processing temperature
  • Rapid vulcanization without reversion
  • Good compression set, particularly at elevated temperatures
  • High temperature resistence
  • Limited extractable constituents from final product
  • No staining of of the finished parts
  • No discoloration of crosslinked product by contact with metals and PVC
  • Most peroxides do not cause blooming
  • Co-vulcanization of saturated and unsaturated rubbers
  • Co-vulcanization of rubbers and polyethylene or other polyolefins
  • Co-polymerization with polymerizable plasticizers, or coagents to give controlled hardness and stiffness, coupled with easy processing

Disadvantages of peroxide crosslinking in comparison with sulfur cure

  • Sensitivity to oxygen under curing conditions
  • Certain additives of the rubbercompound such as fillers, extender oils, antioxidants, and resins must be selected with care because they may, under certain conditions, consume peroxide free radicals
  • Usually tensile and tear strength are reduced by 15% compared to a conventional sulfur based crosslinking system
  • Scorch and cure time are less flexible, since they are determined mainly by the temperature
  • During cure, some peroxides give off distinct odors
  • Post cure may be necessary
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