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Fascinating Silicone™ Chemistry Corner – Addition Cure

Temperature-activated addition cure systems for silicone polymers


Reaction: Addition
Reactants/functionality: SiOH/SiH
Catalysts: Platinum, rhodium
Stimulus for cure: Accelerated by heat

Common applications:
Liquid silicone rubber (LSR), foamed LSR, high-consistency rubber (HCR), moldmaking, release coatings for paper, die attach adhesives

Advantages

  • Cure without byproducts
  • Clear, deep-section cure
  • Good adhesion

Disadvantages

  • Limited bath life
  • Potential for catalyst poisoning and substrate inhibition
  • Catalyst cost

Expand your understanding

Learn about:
One- vs. two-part systems
Peroxide cure
Condensation heat cure
RTV moisture cure
Photo-initiated addition cure

Explore your material options

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