Attapulgite (ATP) is a hydrated clay mineral of magnesium and aluminum with a microfiber morphology, high surface area and few surface charges. However, clay minerals contain accessory minerals that make it difficult to interact with the polymer. Then, a purification process is necessary to improve the interactions between ATP and polymers. Furthermore, the non-polar nature of LLDPE can also hinder these interactions. One way to improve these interactions is the surface modification of ATP, like the silanization process. The silanization reactions occur due to the interaction by covalent bonding of the silylating agent with the silanol groups that are on surface of the clay minerals. Therefore, the main objective of this work is to study the influence of ATPs on the mechanical properties of LLDPE/ATP nanocomposites.