Feldspars for ceramics
High-quality feldspar fluxing agents for bodies and glazes
Feldspars are essential fluxes for ceramic manufacturers, which ensure consistent vitrification, mechanical strength, and excellent surface quality in products ranging from tiles and large slabs to tableware and sanitaryware.
Imerys operates feldspar mines and processing plants in France, Germany, Turkey, the United States, India and Thailand.
Drawing on decades of ceramics and minerals expertise, Imerys supplies high-quality feldspars tailored to meet the specific technical requirements of ceramic bodies and glazes, supporting process reliability, product consistency and industrial performance across a wide range of ceramic applications.
Imerys feldspars offer unique mineral properties
Imerys' feldspars offer reliable performance in both ceramic bodies and glazes due to their controlled alkali content and minimal iron and titanium levels. These properties result in:
- Improved vitrification and firing stability
- Enhanced mechanical strength and durability
- Consistent whiteness and surface quality
- Reliable performance across different ceramic bodies and processes
Our feldspars are particularly suitable for highly demanding ceramic applications, including large slab production.
Feldspars for tiles and slabs
Using Imerys feldspars in the ceramics manufacturing process delivers several key benefits:
- Energy and CO2 savings: A better balance of fluxing oxides enables manufacturers to lower firing temperature or shorten firing cycles.
- Resource efficiency: Felspar limits shrinkage, lowering raw material consumption.
- Enhanced mechanical strength
- Improved body whiteness
Their performance is particularly critical for large surface tiles and slab production, where mechanical resistance and dimensional control are essential.
Recommended feldspar grades for tiles and slabs
- RF4
RF4’s unique composition optimizes pressability, improves packing density and thermal stability, whilst promoting formation of low-density phases.
- Fusilith
Fusilith, a lithium feldspar, can be used at a 5-8% loading to reduce shrinkage while increasing the fusibility of the formula. It supports ceramic body performance and process stability.
- Minspar 200
Minspar 200 is a flotation grade mixed feldspar used in glazed and clay bodies.
- Minspar 170
Minspar 170 is a high quality mixed feldspar (sodium/ potassium/ calcium aluminum silicate) milled to 170 mesh specifications which provides a slightly coarser option to maximize cast rate. It offers a low iron oxide and high alkali oxide content per unit of alumina.
- Minspar 250
Minspar 250 is a high quality sodium/potassium/calcium aluminum silicate offering low iron oxide and high alkali oxide per unit of alumina making it ideal for use in a wide variety of ceramic applications.
- KFC5P
KFC5P is a potash feldspar with controlled alkali content and low impurities, contributing to whiteness and vitrification.
- Spar 75
Spar 75 is a high quality potash feldspar milled to 200 & 325 mesh specifications. Low iron and high alkali content makes it suitable for glaze applications.
- Spar K12
Spar K12 is a high purity, high alkali potash feldspar milled to 200 & 325 mesh specifications.
- Ceraflux N5P
Ceraflux N5P is high quality sodium feldspar with medium whiteness, also suitable for glaze applications.
- Ceraflux Vivo Spar
Ceraflux Vivo Spar is a high quality mix feldspar offering low iron oxide and high alkali oxide per unit of alumina making it ideal for use in a wide variety of ceramic applications.
We provide alternative kaolin solutions for tiles and slabs beyond the ones showcased in this section. Contact our sales team to explore how we can tailor our products and expertise to your specific needs.
Our mineral offer for tiles and slabs also includes prepared bodies, glazes, as well as a range of ball clays, kaolins, halloysites and kiln furniture solutions.
Feldspars for tableware
Our feldspars and pegmatites are ideal for high-quality tableware production, where they contribute to good fusibility — resulting in defect-free products — and strengthen the fired bodies enhancing durability. Characterized by their high potassium and low iron and titanium content, they ensure excellent whiteness and translucency.
We implement a strictly controlled production process, carefully tailored to the technical requirements of tableware manufacturers. Furthermore, we offer support to help you accurately determine the optimal feldspar proportions for your tableware body recipe, preventing over-vitrification during the firing process.
Recommended feldspar grades for tableware
XS100P is a high-whiteness, milled potash pegmatite.
KFC5P is a potash feldspar with controlled alkali content, low impurities and low iron content - supplied in 5mm chip form.
Feldspars for sanitaryware
Our feldspars and pegmatites are characterized by their high potassium content and low iron and titanium content – ideal for whiteness in sanitaryware.
Used in sanitaryware bodies, feldspar boosts the vitrification process, rendering the fired piece non-porous.
Used in glazes, feldspar provides a good source of alumina and alkali.
Recommended feldspar grades for sanitaryware
XS100P is a high-whiteness, milled potash pegmatite - for high quality glazes.
- Spar 70 is a high quality potash feldspar milled to 200 & 325 mesh specifications. Low in iron and high alkali content makes it suitable for glaze applications.
- Spar K4 is high-quality potash feldspar, milled to 200 & 325 mesh specifications, for frit and glaze applications. With high alkali and low iron content, it improves whiteness and spectrometric color.
Ceraflux K5P is high quality potash feldspar with medium whiteness, also suitable for glaze applications.
Fusilith is a lithium feldspar to reduce firing cycle and temperature.
We provide a broader range of felspars for sanitaryware beyond those mentioned here. Contact our sales team to explore how we can tailor our products and expertise to your specific needs.
Our sanitaryware range also features a full range of ball clays, kaolins, chamottes, wollastonites and talcs* — as well as kiln furniture solutions.
Supporting you worldwide with recognized expertise
As a reliable global supplier, with decades of minerals and ceramics expertise behind us, we are well positioned to support your operations across Europe, the Middle East, the Americas, and Asia Pacific.
Our experienced ceramics technical support teams, based in Western Europe, North Africa, and Asia, are dedicated to helping you optimize your formulations and processes to achieve your specific objectives. This commitment extends to serving new players in the ceramics industry with tailored support, including laboratory or on-site training.
With established logistic platforms in Europe and Asia Pacific, we guarantee the delivery flexibility necessary to ensure you receive the correct product precisely when you need it, no matter your manufacturing location.
Connect with our ceramic experts today to explore how we can assist your business.
*Talc products are not available in the USA and Canada. Contact us for an alternative range.
Sanitaryware
Ceramics
Imerys supplies high-performance mineral solutions used in ceramic manufacturing across sanitaryware, tableware, tiles and technical ceramics. Our portfolio of kaolin, ball clay, feldspar, wollastonite and talc supports ceramic body formulation, glaze performance and firing stability. Ceramic producers across Europe, Asia, Middle East, Africa, North and South America rely on Imerys minerals to improve product strength, surface quality, whiteness and manufacturing efficiency.
