Bound To Character
When you fit an item to your ship, (or indeed install a new chassis) that item will become bound to your character. This means that it cannot be sold or traded to other players. You essentially have 2 choices when you are finished with it. You can either delete it, or you can recycle it (if a schematic exists, so this rules out civilian items!)
Up until the point an item is “equipped” you can do what you like with it. Sell it in your Emporium, trade it via email with other players, whatever you like.
As soon as it is fitted though, it will be locked to the player that fitted it.