For the production of film and bags, there are two main types of polyethylene, low density (LDPE or PELD) and High Density (HDPE or HDPE) also known as Low Pressure (PEBP), although each of them there is a wide range of degrees. The procurement procedures of both types are different and their chemical and physical properties also differ significantly, as a result of a different molecular structure.

By adding suitable colorants are available polyethylene films with a variety of colors.

Low Density Polyethylene is obtained at high pressures (between 1000-3000 atm.) At temperatures between 100 and 300 ° C in the presence of oxygen as a catalyst. It is a thermoplastic product of density and elastic soft 0.92. In its natural state is completely transparent film, decreasing this feature in terms of thickness (gauge) and the degree.

High Density Polyethylene (Low Pressure), differs in that obtained at low pressure and low temperature in the presence of organo-metallic catalyst. Has in its features, more strength and rigidity. their density is higher (0.94). In nature, the film, although it is translucent, not transparent, having a waxy, same as above, its appearance will vary depending on the extent and thickness (gauge).