Sapphire substrate is the popular substrates for III-V nitrides, superconductor and magnetic epi film due to less mis-matched lattice and stable chemical and physical properties.
Wafer size
10 x 10 x 0.5 mm thick
Orientation
(0001) +/- 0.5 o
Polished surface
substrate surface is EPI polished via a special CMP procedure with Ra < 5 A
1 side polished
Package
Each wafer is packed in 1000 class clean room with 100 grade plastic bag with wafer container.