TheCharacterization demand for new eco-friendly materialsEco-friendly materials is generating a race to discover good alternatives to replace the synthetic materials used commercially at this time. Raw materials from plant resources are becoming a good option in this regard, especially natural fibersNatural fibers that are usually discarded in landfills. The purpose of this work is to develop a new environmentally friendly polymer compositePolymer composites based on montmorillonite clayMontmorillonite clay powder. Clays (mainly montmorillonite-rich, in situ weathered volcanic rocks—bentonites) are considered the most suitable material for the external multibarrier system. The main objective of this work is to thermally and mechanically characterize the compositesComposite made with a common epoxy resinEpoxy resin (DGEBA/DETA) and the ground montmorillonite clayMontmorillonite clay, whose incorporation was in volume from 5 to 30%, made in an open silicone mold. The results show good thermal stability and satisfactory mechanical propertiesMechanical property for engineering applications, e.g. rigid casing structure and piping in industry with very low cost.