SUNTHERM Ceramic fiber modules are designed for application temperatures up to 1260°C, 1360°C, 1430°C, fibers offer significantly reduced thermal shrinkage compared to refractory ceramic fibers. The reduced shrinkage makes it possible to use modules at much higher temperatures than ceramic fiber modules. The polycrystalline structure of the fibers also prevents the generation of cristobalite, a serious health concern with refractory ceramic fibers