OZARK TECHNICAL CERAMICS developed the production of High temperature Hafnium Oxide Insulators to service new advancements in high temperature thermometry. Hafnium Oxide Insulators are also useful as a non-toxic alternative to beryllium oxides in existing applications. OZARK Hafnium Oxide Insulators are routinely used for applications to 2200 C.

Hafnium Oxide, or Hafnia (formula HfO2), is a very refractory high temperature material which may be considered an exotic material in the fabricated form. OZARK developed a fabrication process for Hafnia in the early 80's and has been a steady source of Hafnia extrusions into a limited customer base. The material has gained wide acceptance in the upper temperature with reported uses to 2500 C.