The advantages of composite sinks are that they are durable, don't require sealing and are available in a variety of styles and colors. They also cost less than natural stone sinks. Their disadvantages include vulnerability to harsh chemicals and higher cost compared to porcelain or steel sinks.
Manufacturers make composite sinks from a mix of granite or quartz dust and acrylic resin. They use high pressure to mold the sinks, forming a nonporous, hygienic surface that resists stains, chips and dents but is hard and unforgiving. Composite sinks are uniform in color throughout, which may be an advantage or a disadvantage depending on whether the buyer prefers the variations typical of natural stone. The cost of a composite sink rises with the percentage of stone dust in the mix.
To avoid damage to a composite sink, homeowners should follow the manufacturer's recommendations regarding suitable cleaning chemicals and products to avoid pouring into the sink. Selecting a sink specifically designed for high heat resistance reduces the chance of heat causing stains or other damage.
Composite sinks have fewer style options than porcelain models and are usually best suited to contemporary decor. They are typically more difficult to install than porcelain or steel sinks.