Why Foundries use Water-Based Mold Release Agents in De-Molding

The Mexican die casters and the foundries world over use water-based mold release agents in de-molding phase, as it is one of the best practices in high-pressure die casting. In fact, de-molding is an important phase where the casting is obtained using the mold release agents. In order to execute the whole metallurgical process with full efficiency, it is needful to form the mold design accurately and also select the accurate mold release agent for that.

There are various mold release agents used in the de-molding phase, out of which, water-based ones, powder-based ones, and oil-based ones are in use in foundries nowadays. Each parting agents has a specific function, a temperature range, and are used for a given alloy, executing a given surface finish or for final usage of the part. That is one of the reasons, why the accurate volume of the release agent, that necessitates in de-molding is partly dependent on the right mold design.

Mexican die casters design the molds using surfaces with an element of slope to aid easy removal of the casting, complete the process in short cycle, and prevent tensions, which may affect the life span of the part. Dilution water made via the mixing of emulsifying agents and stirring using temperature pressure forms a key element of the water-based mold release agents in use. They are a mix of raw materials having precise proportions, substances and lubricant strength in water – essentially a mix of both oil and water simply put.

The release agents fall on the mold’s wall using various techniques like injection and compression, to name two when in practice. When fallen, they yield the molten metal in high-pressure die casting covering the desired surface finish. Such dispersions are typically done via a spraying method, which yields a formation of minute droplets covering the whole surface of the mold.

When the release agent come in contact with the mold’s hot surface, the water gets evaporated and a lubricant film is formed over the mold, which would aid the de-molding process. Apart from aiding in the removal of the part from the cavity and prevention of metal particles from sticking on the mold surface with layers of film, the release agents also aid in cooling the wall of the mold.