Whatareceramictilesmadefrom
What Are Ceramic Tiles Made From?
Ceramic tiles have been produced from natural earth materials for thousands of years. Understanding what goes into a tile, and how the combination of raw ingredients affects the finished product, helps you make a more informed choice for walls and floors in your Elstow or Bedford home.
Ceramic tiles belong to a family of materials that includes bricks, pottery and porcelain. All are made by shaping and firing clay-based raw materials at high temperatures. What distinguishes a ceramic tile from other clay products is the combination of raw materials used, the precision of the forming process and the controlled conditions under which it is fired.
The Primary Raw Materials
A standard ceramic tile body is a blend of three main mineral groups: clay minerals, non-plastic materials and fluxes. Each serves a distinct function in the manufacturing process and in the performance of the finished tile.
Clay is the backbone of every ceramic tile. It provides plasticity when wet, allowing the material to be shaped, and it bonds the mix together during firing. Kaolinite and ball clay are the most commonly used clay minerals. Ball clay adds plasticity; kaolinite provides a clean, white-burning base that contributes to the brightness of the finished tile body.
Feldspar is a flux, a material that lowers the melting point of the mix. During firing, feldspar melts and flows into the spaces between clay particles, binding the tile body into a dense, cohesive mass. It is feldspar that gives the fired tile its hardness and low porosity. Without it, the clay body would remain weak and porous after firing.
Quartz sand or silica provides structural stability and reduces shrinkage during firing. It acts as a filler that prevents excessive deformation as the tile body contracts in the kiln. Quartz also contributes to the hardness of the finished tile and is a key factor in the tile’s resistance to thermal shock and mechanical stress.
Small quantities of additional minerals and processing aids are included to modify specific properties. Calcium carbonate may be added to control firing behaviour. Iron oxides produce terracotta and red clay body colours. Deflocculants such as sodium silicate are used to control the flow of the clay slurry during processing.
How Composition Affects Tile Performance
The precise blend of these materials determines almost every performance characteristic of the finished tile. A higher feldspar content produces a denser, less porous tile body. A higher clay content produces a more plastic mix that is easier to form but may result in a slightly more porous body. The ratio of quartz controls dimensional stability during firing.
| Raw Material | Primary Function | Effect on Fired Tile |
|---|---|---|
| Kaolinite (white clay) | Plasticity, binding | Clean white body, low shrinkage |
| Ball clay | Plasticity, green strength | Buff or grey body colour |
| Feldspar | Flux (lowers melting point) | Density, hardness, reduced porosity |
| Quartz / silica | Filler, structural stability | Hardness, dimensional accuracy |
| Calcium carbonate | Secondary flux | Whitens body, modifies firing range |
| Iron oxide | Colourant | Red, terracotta or buff body colour |
The Difference Between Ceramic and Porcelain
Porcelain tiles are a subcategory of ceramic tiles but are produced from a different, more refined raw material blend. Porcelain bodies use a higher proportion of feldspar and a finer-ground kaolin clay. The result is a denser tile body with water absorption below 0.5 percent, compared to the 3 to 6 percent typical of standard ceramic tiles.
The higher feldspar content in porcelain requires a higher firing temperature, typically 1,200 to 1,400 degrees Celsius versus 1,000 to 1,150 degrees for standard ceramics. This produces a vitrified tile body where the mineral components have fused so thoroughly that the tile is essentially non-porous without any glaze layer being necessary.
The word ceramic covers a broad family of fired clay products. Porcelain is a type of ceramic, but not every ceramic is a porcelain. The key distinction lies in body density and water absorption, both of which are determined by raw material composition and firing temperature.
The Glaze Layer
On glazed ceramic tiles, the visible surface is not the clay body itself but a glass coating applied before firing. Glazes are produced from a blend of silica, alumina, fluxes (lead was historically used but is now prohibited) and metal oxide pigments that provide colour. The glaze is typically applied as a liquid suspension and then fired alongside the tile body, fusing to the surface as a thin, continuous glass layer.
The chemical composition of the glaze is engineered separately from the tile body to achieve specific properties including colour, surface texture, hardness and the coefficient of thermal expansion. If the thermal expansion of the glaze does not match that of the tile body closely enough, the glaze will craze (develop a network of fine surface cracks) or shiver (flake away from the body surface) as the tile cools after firing.
Typical Water Absorption by Tile Type (BS EN 14411)
Natural and Recycled Content
All the primary raw materials in a ceramic tile, clay, feldspar and quartz, are naturally occurring minerals extracted from the earth. The industry has worked to increase the use of recycled content in tile bodies, with some manufacturers incorporating recycled ceramic waste from factory production offcuts, post-consumer glass and other silicate materials as partial substitutes for virgin raw materials.
Several leading European manufacturers now produce tiles with recycled content of 30 to 60 percent by weight, contributing to certifications under green building frameworks such as BREEAM and LEED. The presence of recycled content in a tile does not affect its performance provided the substitute materials are chemically compatible with the mix and the firing specification is adjusted accordingly.
Explore Our Ceramic Tile Range in Elstow
Visit Precious Marble in Elstow to see our full range of ceramic wall and floor tiles. Our team can advise on tile composition, performance and the right choice for your project.
View Ceramic Tile RangeWhy Material Composition Matters When Buying
Understanding what a tile is made from helps you interpret the technical data sheets that accompany quality tiles. Water absorption figures, modulus of rupture (breaking strength) and frost resistance all flow directly from the raw material composition and firing conditions. A tile with 6 percent water absorption is not suitable for outdoor use in a UK climate where freeze-thaw cycles will force water into the tile body, expand it and eventually cause surface spalling. A tile with 0.5 percent or below will resist that cycle indefinitely.
When browsing tiles at Precious Marble in Elstow, our team can provide the technical specifications for any tile in the range, helping you match material performance to the demands of your specific application.
Ceramic Tiles Hub: Bedford and Elstow
Return to our main ceramic tiles hub to explore the complete series of guides covering every aspect of ceramic tiles for Elstow and Bedford properties.
Back to Ceramic Tiles HubOur ceramic tiles Bedford hub is the full resource for this content series, covering tile materials, manufacturing, applications, installation and long-term care.
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