Home Products Composites | Compounds | Ceramics Beryllium Oxide Ceramics BW 1000® BW1000 BERYLLIA BW 1000 Beryllia ceramic components convey an exceptional combination of properties: Second only to Diamond among electrical insulating materials, BW 1000 material provides a thermal conductivity of 275 W/m•K at room temperature. 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' BW 1000 or other beryllium oxide materials, please contact Materion Ceramics.