rFOIL is produced with 99.9% pure aluminum or metalized polyester. These are the purest products available on the market. They are highly resistant to discoloration or corrosion. Less than pure aluminum contains filler materials. Often, it is these fillers that are discolouring, not the aluminum content itself. For this reason, rFOIL is always produced with the highest quality products available. rFOIL is also coated with a clear resin to further protect the integrity of the surface.