A thorough investigation on the salt stoichiometry of the added fluoride salts to the melt was carried out in an attempt to prepare In-situ Al1050-5wt.% TiB2 composite. It is well known that addition of fluoride based K2TiF6 and KBF4 salts to the aluminium melt produces TiB2 particles. The stoichiometric ratio of the fluoride salts which were added to the melt was changed and the obtained results were analyzed. Addition of slightly more KBF4 salts to the melt produced better results yielding only TiB2 particles. However more addition of KBF4 salts resulted in formation of more amount of entrapped slag in the composite. The stoichiometry of the salts decides the final reinforcement product in the composite