Cheap window tints generally has no UV protection, and the tint is basically in the glue. This makes the film very cheap, but also thin and not very durable. Since the dye is in the glue, which is stuck to the window, it is really susceptible to UV from the sun. It has almost no heat rejection at all (depending on the quality of the tint).
The next type is a bath dyed film, where the polyester is dyed, the glue is on a separate layer, plus a layer of UV rejection. Next is maybe (depending on the brand) a layer of UV on the other side of the polyester, plus a scratch coat. This type of film is generally between 3 and 5 layers thick, pressed into one film. Our standard, basic film is called ST, find it HERE.
Carbon film is a great choice for auto tint. It does not fade over time, and blocks 40% UV rays. Carbon is a nice choice for cars and RV's if you're on a budget. Check out our Nitro Carbon Film.
Ceramic film is the very best. It uses a ceramic pigment polyester to help reject 99% UV rays and is generally used in automotive applications only due to its high absorption rate. Auto glass is tempered, giving it the durability to withstand the higher temperatures that the film will absorb. Some dealers will say that it can be used on any window, we do not recommend ceramic film in residential windows. Our ICE Ceramic Film is the best that we carry. If you want a premium decorative film for your home, try static cling decorative film on this site, or check out our sister company Window Film and More.