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Fascinating Silicone™ Chemistry Corner – Moisture Cure

RTV moisture cure systems for silicone polymers

Learn how RTV moisture cure systems for silicone polymers work with a condensation reaction in humidity.

Common applications:
Building sealants, bathtub caulk, roof coatings, elastomers, curable medical adhesives, electronics adhesives, fabric and leather waterproofing coatings


  • RTV (room-temperature vulcanizing); cure can be accelerated by increasing temperature and humidity
  • Robust cure system
  • One-part ease of use
  • Relatively low cost
  • Good adhesion
  • Neutral cure options (alkoxy)


  • Shelf- and pot-life limitations related to the potential for accidental exposure to moisture vapor.
  • Acetoxy cure generates acetic acid, which is corrosive to metal and has an unpleasant vinegar odor.
  • Isopropyl alcohol or lithium-based additives found in greases and lubricants can inhibit some moisture cure products.
  • Relatively slow rate of cure.
  • Only useful for relatively thin sections due to moisture requirement; not good for highly confined applications.

Expand your understanding

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

Explore your material options

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