Question: are heat sinks made of aluminum?
Answer: The most common heat sink materials are aluminium alloys. Aluminium alloy 1050 has one of the higher thermal conductivity values at 229 W/m•K but is mechanically soft. Aluminium alloys 6060 (low stress), 6061, and 6063 are commonly used, with thermal conductivity values of 166 and 201 W/m•K, respectively.