but clays are formed by numerous platelets, yielding submicrometer particles. When clays are dispersed into a polymer matrix, they experience swelling, dividing all of the platelets into independent units at the nanometre scale, hence the name “nanocomposite materials”. These platelets force gases to follow a tortuous path through the material which greatly slows their transmission. As a result, a nanolayer clay structure is obtained, and the path of diffusion of the penetrating molecules of gases and other substances increases, providing substantially improved products