AlSi50, also called CE11 in many countries, is the most common used AlSi alloys.
Light weight: only about 1/3 the weight of Kovar;
Low CTE: 7-20ppm/℃, compatible with GaAs,Alumina,GaN etc;
High thermal conductivity: up to 180W/mK;
Easy to be machined: CNC/EDM
Easy to be plated: can be plated as common aluminum alloys;
Easy to be welded: Baienwei AlSi alloys have high welding finish rate.