HT300 Gasket Maker RTV Silicone

Akfix HT300 is a high-performance silicone sealant developed for sealing, bonding, and repairing works where heat resistance is required. It is an ideal sealant for high-temperature construction applications. It reacts with atmospheric moisture to produce a tough, elastic silicone.



  • Excellent heat resistance after curing up to 250 °C permanently and up to 300 °C temporarily.
  • 100% silicone,
  • Remains flexible at low (-40 °C) and high (+250 °C) temperatures,
  • Resists to mechanical enforcement after curing,
  • Acetoxy cure, RTV silicone,
  • Will not crack, shrink or become brittle,
  • One component.
Application Areas

  • Sealing and bonding applications in automotive,
  • On heating systems and ovens for sealing/tightness,
  • Sealing and bonding in stoves,
  • Gaskets in pumps and motors,
  • Sealing chimneys,
  • Other bonding and sealing applications where parts must perform at high temperatures.


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