system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Did Vader really need to test the carbon freezing chamber on Han? He was frozen in carbonite once during the Clone Wars along with Obi-Wan, Captain Rex, Commander Cody, and Ahsoka.
gpt
They were frozen using a high-quality carbon freezing unit intended for that exact purpose. The one on Bespin was an industrial unit intended for preserving tibanna gas for transport. It was uncertain whether it would be safe for a high-value prisoner.