Porcelain tiles are ceramic tiles with a water absorption rate of less than 0.5 percent that are used to cover floors and walls. They can either be unglazed or glazed. Polished Porcelain is a dense tile.

The hard surface of porcelain has made polishing a viable alternative to a glazed surface. This means that a tile can be fired and then a polish is cut into the surface, creating a shine without a glaze.

When porcelain is first made, it is not absorbent, but the polishing process for making the unglazed surface shiny cuts into the surface, making it more porous and prone to absorbing stains, in the same way as natural stone tiles do. Unless they have a suitable, long-lasting treatment put on by the manufacturer, such as nanotech treatment, polished porcelain tiles will need sealing.

Porcelain sealers are either water-based or solvent-based. Solvent based sealers are advised when choosing Polished Porcelain tiles.

Porcelain is much harder than ordinary ceramic tiles and is usually selected, despite its higher price etc. in areas where strength is more important, such as floors and commercial use, or in areas of high wear and hard knocks.
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