302 Hi-Temp Silicone

Technical Data Sheet

NuFlex® 302 Hi-Temperature (HT) Silicone Gasket Maker is a one-part, non-slumping 100% silicone sealant with the consistency similar to that of toothpaste. It cures when it is exposed to moisture in the air to form a tough rubbery seal.

NuFlex® 302 HT was formulated to perform at temperatures ranging from –65°C to 260°C (-85°F to 500°F) under continuous operating conditions. During intermittent exposure, NuFlex® 302 HT will withstand temperatures as high as 316°C (600°F). It is ideal for a number of sealing and bonding applications.


  • NSF Approved.
  • 100% Silicone.
  • 100% RTV.
  • Adheres to many substrates.
  • Withstands up to 316°C (600°F).

Typical Uses

  • Fireplaces, industrial ovens, and high temperature HVAC applications.
  • Gasket making for various automotive, marine, and small engine applications.
  • General weatherproofing in residential, commercial, industrial and automotive applications.


  • Permanently flexible.
  • Quick curing.
  • Moisture, heat and vibration resistant.
  • Multiple uses.