Tiles are created from clay that has been kiln-fired. Before the ceramic tile is placed in the kiln, any necessary glaze is applied. But what is an unglazed tile? If no glaze was applied, the completed tile is referred to as "unglazed." During the firing process, the glaze bonds to the clay surface on top of the tile. This is the primary distinction between glazed and unglazed tiles. Unglazed ceramic and porcelain tiles contain natural pigments or derive their color from clay-based mineral deposits. These pressed pigments can be used to create patterns that extend all the way through the tile, as opposed to merely being a design on its surface (a "full body porcelain tile"). Therefore, unglazed tiles have an earthy, natural appearance. As they lack a protective layer of liquid glass, unglazed tiles will absorb liquid, which can cause discoloration. Therefore, unglazed tiles must be protected with a protective sealant that must be periodically reapplied. In contrast, glazed tiles will not absorb moisture over time. 
Specialty, unglazed, matte porcelain floor tiles are frequently selected for high-traffic commercial areas such as hotel lobbies, airports, etc. This flooring is extremely costly, dense, and heavy. Because the color and pattern run all the way through the tile, the original color and pattern would remain visible even after years of extremely heavy use. All unglazed tiles will always have a matte appearance, with the exception of polished porcelain tiles, which are initially unglazed tiles. Their highly shiny, mirror-like surface lacks gloss. They are polished using a buffer on an industrial scale to achieve their high sheen. Although porcelain that has been polished is glossy, it does not have a gloss glaze. It is an unglazed tile that has been polished mechanically in the same manner as marble or granite tiles. Polished porcelain must be sealed to prevent staining in the same manner as polished marble or granite tiles. Polishing porcelain alters its physical qualities, specifically its absorption rate. Standard, or "matte," porcelain does not accumulate dirt and stains due to its finely textured surface; yet, it may show minor surface soiling that is easily clean. 
The application of a penetrating sealer is necessary because mechanical polishing at the factory creates a smoother surface that is less likely to attract and retain dirt from shoes, etc., but destroys the porcelain dust beads and enlarges the tile's small pores. The porcelain tile becomes slippery when wet as a result of polishing, which creates a smooth, mirror-like surface. Despite the fact that they are more slippery and hence more hazardous when wet, polished porcelain tiles are usually utilized for public walkways in shopping malls since they are easier and cheaper to maintain. After a penetrating sealer has been applied to the surface of the polished, or lappato, unglazed porcelain tiles, they must be washed with a pH-neutral cleanser that was developed specifically for this purpose. Standard floor cleaners have a high pH level that destroys the sealer, reducing its efficacy and shortening its lifespan. Because adding a quality penetrating sealer can only address the staining problem but not the slickness issue, it is recommended to use porcelain that has been polished on walls or floors that are unlikely to become wet. 
Even if tiles with a matte finish are slip-resistant, it is always prudent to check the manufacturer's slip rating. Even matte-finished, unglazed porcelain may have varying slip ratings if the colors are different. Unglazed porcelain with a lappato, or honed, the finish will have a slip rating that falls between polished and matte. Only use textured surfaces outdoors because they are difficult to clean and have a very high slip resistance rating. Glaze must be applied to clay tiles prior to firing them in a kiln if they are to be coated with glaze. During the firing process, the glaze is infused into the top layer of clay on the tile. However, if the tile is not coated prior to firing, it is known as an unglazed tile. This technique distinguishes between glazed and unglazed tiles based on the coating on the tiles. The color of unglazed porcelain or ceramic tiles is derived from the clay from which they are fashioned or from the addition of pigments. When these tiles are pressed to produce patterned designs, the pattern permeates the entire tile, not just the surface. In this sense, unglazed tiles appear more organic and earthy. 
After being fired in a kiln, unglazed tiles do not require any additional coating and are ready for use. Before undergoing the high-temperature firing process, glazed tiles are coated with enamel or liquid glass. Because of their slip-resistant and natural finish, unglazed tiles are often used outdoors, in commercial spaces, and in wet areas, whereas glazed tiles are typically used in residential constructions due to their fine and slippery finish. Even with a scratch-resistant coating, unglazed tiles are susceptible to staining since their natural finish readily absorbs liquids. Glazed tiles are less prone to become stained due to their impermeable and scratch-resistant finish, which is achieved by coating them with liquid glass. Glazed tiles are thinner and less dense compared to unglazed tiles. Glazed tile patterns and prints, which come in a broad range and include digital prints created with inkjet printing technology, appear far less organic, rustic, and earthy than unglazed tile designs. Unglazed porcelain tiles are constructed entirely of porcelain for a uniform appearance, whereas glazed porcelain tiles incorporate additional components to make them more durable and dependable. A big collection of glazed and unglazed tiles are available in our company. If you are in need of unglazed ceramic tiles, contact our sales managers.
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