Home Products Beryllium Products Beryllium Oxide Ceramics BW3250® BW3250 BERYLLIA BW3250 Beryllia ceramic components convey an exceptional combination of properties: Second only to Diamond among electrical insulating materials, BW3250 material provides an amazing conductivity of 325 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' BW3250 or other beryllium oxide materials, please contact Materion Ceramics.