One of the most widely-available metallic materials known across the galaxy. It's not exactly the toughest of materials, but it's enough to protect a ship, for a while at least. It has the bonuses of being as strong as steel, at only 60% the equivalent density. Thus, 6cm of titanium is equal in protection to 10cm of steel. It is also easy to work, and highly resistant to wear and tear - especially corrosive or acidic weather.