Poly-separator sheeting is indeed a low-density polyethylene (LDPE) cast film that’s been embossed. This film is often used as a release liner in various applications, particularly when easy release is needed, like with tacky or rubber composites. The embossing helps in releasing air between the film and the material it’s separating. The film is commonly made with diamond embossing, but other textures like taffeta, matte, smooth, linen, sand, and grit are also available. It can also be customized in color, size, gauge, and other specifications.