The Ni based superalloy Inconel 718 (IN718) is widely used in high temperature applications, nuclear and petrochemical industries due to its high strength at elevated temperatures, oxidation resistance and heat corrosion resistance. In this study, IN718 compacts were fabricated using the metal Injection moulding (MIM) and then evaluated for high temperature applications applications. Standard tensile bars were produced and then subjected to room temperature and high temperature mechanical tests at 650?C. A selected number of samples were also subjected to hot isostatic pressing (HIP), solution treatment and aging. Assessments of the chemistry, tensile properties and fracture surfaces after mechanical testing were carried out. The results of the properties of the final parts were compared to the SAE AMS5917 specification. After heat-treatment, a large amount of ?" and ?' phase were precipitated which increases the tensile strength and decreases the elongation of the alloy.