Under gravity and low pressure conditions, moulds must be painted using silicate products, which improve the temperature dissipation of the casting during the solidification stage. Keeping the paint intact is essential for the quality of the castings. To improve the smoothness of the molten metal and protect the paint, it is good practice to apply a dry powder lubricant at each production cycle.
Generally, the product used is a mix of talc. More sophisticated mixtures are used only in particular cases. As the mix of talc is a magnesium phyllosilicate with a lamellar structure, it has excellent lubricant properties. Moreover, its chemical and physical properties help the correct temperature dissipation of the casting. Talc has a melting point above 1000 °C. Therefore, it is important to pay attention to the method you use to apply it to the mould.
With the mix of talc, you don’t need to whiten the mould. You just need a micro-dosed layer of it to enhance the quality of the product. The electrostatic efficiency of the equipment is essential to prevent the dispersion of the product into the environment. Note that the mix of talc must be supplied evenly to prevent unwanted thickness on the die surface and leave the roughness of the paint unchanged.
Altea’s DRY LUB SYSTEM is the result of 20 years of experience in the foundry industry. This method meets the clients’ needs, whether used manually or automatically. The electrostatic efficiency of the DRY LUB SYSTEM ensures high performance and an even supply, preventing the product from dispersing into the environment. Note that the mix of talc must be supplied evenly to prevent unwanted thickness on the die surface.