In the realm of cement concrete, super - fine active metakaolin stands out as a high - performance supplementary cementitious material. Its extremely fine particle size and high pozzolanic reactivity enable it to react with calcium hydroxide released during cement hydration. This reaction forms additional calcium silicate hydrate (C - S - H) gels, enhancing the concrete's density, strength, and durability. It also improves resistance to chemical attacks and reduces permeability, making it ideal for high - strength and long - lasting construction projects.
Washed kaolin is a cornerstone in the paper industry. After a thorough washing process to remove impurities, it offers excellent opacity, brightness, and printability. As a filler and coating pigment, it enhances the paper's surface smoothness, allowing for sharp and high - quality printing results.
Calcined kaolin is a key ingredient in ceramics. The calcination process alters its structure, increasing its whiteness and improving its thermal stability. It is used to adjust the firing temperature and shrinkage rate of ceramic bodies, ensuring consistent and high - quality ceramic products with fine textures and appealing finishes.
| Cas No. |
1332-58-7 |
| Place of Origin |
China |
| Color |
White/Yellow |
| Shape |
Powder |
| Purity |
90-97% |
| Grade |
cosmetics grade/industrial Grade |
| Package |
5-25kg/bag，customized package |
| MOQ |
1kg |
Coatings industry uses a lot of kaolin powder—it works as a helpful additive and a smart way to stretch more expensive pigments. Think of its flat, sheet-like particles as tiny protective tiles: when mixed into paint, they stack together to form a tight layer on surfaces, so the paint covers well even with less of the costly pigments. The super tiny grains also make the paint go on super smooth—no bumpy spots or ugly brush marks left behind, whether you’re painting walls or metal parts. Calcined kaolin is even better for making coatings shinier and brighter, which is why it’s often used in interior wall paints that need a clean look and industrial coatings for machines that need to look neat. What’s more, this powder helps paint stand up to tough weather: it resists sun fading, rain damage, and rust, so painted surfaces stay looking good for years without peeling or discoloring.
Plastics industry loves adding kaolin powder because it turns regular plastic into stronger, more reliable material. When mixed into plastic resins, it makes the plastic much tougher—able to handle being pulled hard without breaking, survive drops and hits without cracking, and keep its shape even when heated a little. It also tweaks how the plastic melts and flows during manufacturing: this means factories can make plastic products faster, and every piece comes out looking the same. Kaolin powder even lets manufacturers customize plastic’s look—giving it a soft matte finish for things like phone cases or a subtle shine for food containers, fitting all kinds of market needs. Best of all, it mixes well with almost every type of plastic, so you’ll find it in everything from hard plastic buckets and toy blocks to thin plastic food wraps and flexible shower curtains.
Rubber industry values kaolin powder deeply because it makes rubber stronger and easier to work with. When added to rubber mixtures, it acts like a “reinforcer” that makes rubber much more resistant to wear and tearing—critical for parts that get rubbed a lot, like the rubber seals in car doors or the inner lining of hoses. It also slows down the rubber’s hardening process (called vulcanization), giving workers more time to shape and mold it into exactly what they need—no rushing to finish before the rubber sets. Plus, kaolin powder helps rubber last longer outdoors: it stops rubber from getting brittle and cracking under the sun, or softening and breaking in the rain. You’ll spot its work in everyday rubber products: the water-tight seals around windows, the flexible hoses that carry water to sinks, and the gaskets that keep oil from leaking out of engines—all places where durability is non-negotiable.
Industries that make materials for super high heat—like the ones that melt metals in steel factories or make glass in glassworks—rely totally on kaolin powder’s ability to handle extreme temps. Calcined kaolin is the star here: it stays solid and intact even when exposed to blistering heat, which is why it’s a key ingredient in fire-resistant bricks and the linings that line the inside of furnaces. These bricks and linings need to hold their shape no matter how hot the furnace gets, and kaolin powder stops them from shrinking or warping during manufacturing. What’s more, the tiny holes in calcined kaolin act like a heat trap—they keep the heat inside the furnace, so the equipment doesn’t waste energy trying to stay hot. This not only saves money but also makes the factories run more efficiently.
Cable and wire industry uses kaolin powder that’s been specially treated to work perfectly as a filler for insulation—the material that wraps around wires to keep electricity in. The most common treatment (called silane treatment) helps the kaolin mix seamlessly with the rubber or plastic insulation, so there are no lumps or gaps. This makes the insulation much better at blocking electricity, preventing leaks that could cause shocks or short circuits. Even better, the treated kaolin makes the insulation more fire-resistant: if a cable overheats, it’s less likely to catch fire, which is a huge safety win for homes, offices, and factories. The powder’s tiny grain size ensures it spreads evenly throughout the insulation, so every part of the wire is protected—no weak spots that could lead to electrical problems down the line.
Adhesives (like wood glue or super glue) and sealants (like glass glue or caulk) get a big boost from kaolin powder’s unique properties. It makes these products thicker but still easy to spread—perfect for gluing two pieces of wood together or sealing gaps around windows. It controls the thickness just right: not so thin that it runs all over the place, and not so thick that you can’t smooth it out. For sealants, kaolin powder adds flexibility—so when a building shifts a little (like in cold weather), the sealant doesn’t crack. It also makes sealants water-tight, keeping rain and moisture out of homes and factories. Since kaolin is chemically inactive, it doesn’t react with other ingredients in glues or sealants. That means the products don’t go bad over time—they stay sticky and effective for years, even when stored in a garage or shed.
Making kaolin powder is a straightforward process that starts with raw mineral rocks. First, workers crush the big rocks into smaller pieces, then grind them into super fine grains using special machines. Some batches get an extra step: surface treatment. Modern factories use precise equipment to grind the powder to exactly the right fineness—coarser grains for rubber, ultra-fine grains for coatings—so it fits each industry’s needs perfectly. Surface treatments (like using silane or titanate) help the kaolin bond better with materials like plastics and rubber, so it doesn’t separate or clump. These steps ensure kaolin powder keeps up with the demands of modern manufacturing, proving it’s useful far beyond traditional uses like making ceramic or paper.
