Why are white granite and quartz composite sinks not stain-resistant？

White granite sinks do indeed show dirt more easily than dark-colored ones. This is mainly due to the combined effects of material properties and visual principles.

Best granite sinks are composed of resin and quartz sand. The resin types are mainly PMMA and UPR. PMMA resin combined with quartz sand forms a dense structure that effectively prevents the penetration of various contaminants, making the surface easy to clean. UPR, on the other hand, combined with quartz sand creates many tiny micropores. Dark liquids such as tea stains, coffee, and soy sauce, if not rinsed away promptly, will seep into these micropores, leaving yellow stains on the white surface. Scale (alkaline) and oil (acidic) can also slightly corrode the resin surface, making the originally smooth surface rougher and more difficult to clean.

• Regular cleaning: After each use, wipe dry with a sponge and neutral detergent; do not let water stains air dry.

• Deep cleaning: If there are already yellow stains, apply a wet compress with kitchen bleach or stone cleaner for several hours to effectively break down the stains. Never use steel wool or strong acids (such as toilet cleaner), as these will damage the protective layer and make the sink dirtier more easily.

• Sealing and protection: After cleaning and thorough drying, a stone-specific sealant can be sprayed to fill the micropores and form a protective film.

In general, when choosing a white granite sink, it is best to choose a PMMA type granite sink, such as the NAITRON kitchen sink manufacturers from China. It is composed of PMMA resin and quartz sand, with a dense material structure and a nano-treated surface that does not bleed color and is easy to clean.