Exomet Enterprise Rajkot, Gujarat

When the molten metal in mould cavity begins to solidify, it beings to contract. This may lead to voids in the solidifying casting. APC powders are used in risers to ensure that the molten metal present there stays liquid, and gradually fills the voids so formed. APC powders are available in three forms. A. Exothermic Type The compound is formulated so as to continuously and gradually release heat for long duration. The temperature reached is to the tune of 1000° C thus ensuring that the metal stays molten for greater duration. Even when the compound is used up entirely, it serves as an insulating shield to prevent heat loss from molten metal to the outer environment. B. Feeding Type This is iron oxide based APC powder, capable of reaching higher temperature upto 2000° C for longer duration. It also serves as a fresh resource of molten metal during casting solidification and is used especially for avoiding carbon pick-up problems in steel casting.

These are solvent or water based, fusion inhibiting, refractory coatings to be applied on mould walls or cores primarily to give good surface finish and consistent casting quality. This is achieved by Enabling better molten metal flow characteristics thus enabling better filling in intricate mould cavities Preventing surface defects such as metal penetration, sand burn-on (fusion), carbon pick up, sand expansion defects (such as veining, rat tail, finning etc.) or lustrous carbon defect. Preventing mould wall erosion and thus subsequent inclusions in molten metal Improving stripping characteristics of castings