Home Products Composites | Compounds | Ceramics Beryllium Oxide Ceramics Thermalox® 995 THERMALOX 995 BERYLLIA Thermalox 995 Beryllia ceramic components convey an exceptional combination of properties: Second only to Diamond among electrical insulating materials, Thermalox 995 material is a cost effective beryllia material that provides a thermal conductivity of 285 W/m•K. Low Dielectric Constant (6.76) and low tanδ dielectric loss tangent (.0004 at 1 MHz), permitting improved circuit performance at high frequencies. A Coefficient of Thermal Expansion (CTE) of 9.0 intermediate to silicon or gallium arsenide and metals. Ten times greater thermal conductivity than alumina ceramics. Contact Materion Ceramics For more information about Materion Ceramics' Thermalox 995 or other beryllium oxide materials, please contact Materion Ceramics.