Hollow glass microsphere is a kind of specially processed glass microsphere. Its main characteristics are smaller density than glass microsphere and worse thermal conductivity.
Ni-Ti alloy, also known as Nitinol, is a metallic alloy of nickel and titanium in which the two elements are present in roughly equal atomic percentages.
AlN is mainly used in the microelectronics industry as an electrically insulating but thermally conductive barrier in silicon-based electronic devices.