Most automotive paint protection film are based on the same physical construction. It's broken down into four individual layers:
Polyester Release Liner: This is the bottom layer of PPF. It measures about 3.0 mils (or 0.076mm) in thickness. Once it's removed, it exposes the material that provides the bond to the vehicle surface.
Acrylic Adhesive: The next layer up is the acrylic adhesive. It' is a bit thinner – measuring 1.6 mils (or 0.040mm). This provides the durability of adhesion.
Polyurethane: The bulk of PPF is polyurethane. This provides the depth and strength of the paint protection film and measures 6.0 mils (0.152mm).
Clearcoat: The final layer is clearcoat. It measures 0.5 mils (0.0132mm) and acts as the surface layer of the PPF. It is also what helps a ceramic coating like Ceramic Pro to bond on top of the PPF. Some self-healing PPF's are topped with an elastomeric polymer that helps the material maintain its natural shape once it has been stretched or applied.