Paint Fluid Filter

Paint Fluid Filters

Paint filtration can be one of the simplest or one of the most complicated liquid-particle separations encountered in the process industries. Paint filtration, or to be more accurate, "coatings" filtration, involves paints, oils, varnishes, and lacquers that may be very thin and low-viscosity in nature, to very heavy, thixotropic liquids. The percent solids of a coating may vary from zero percent (when filtering solvents or water) to 100% solids, such as pure linseed oil. In a 100%-solids coating, nothing in the can evaporates - everything ends up on the surface to be painted. It is important to understand that "solids," as calculated by the U.S. EPA consists of the pigment particulates plus the non-volatile portion of the vehicle (the vehicle is the liquid component of a coating).

Filtration requires a close look at the pigments used in a formulation. The type, shape, size, and flexibility of the pigment vary widely, as do the percent solids, viscosity, and rheological properties of the vehicle. Substrates may vary from a clean metal finish (automobile), to dirty steel (a bridge), to wood (home siding), and plastic. It is safe to say that proper filtration is key in producing a quality liquid coating, whether that coating is for homeowner architectural use or industrial or commercial applications including military specifications.

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