Runhuabang Calcined Kaolin

Product Description – High-Resistivity Kaolin for Ceramic and Paper Industries

High-resistivity kaolin is an advanced industrial mineral engineered to meet the exacting demands of ceramic glaze and paper coating applications. In the ceramic industry, its exceptional electrical resistivity ensures stable firing conditions, preventing undesirable currents that can mar the smooth, uniform finish of glazes. This property, combined with kaolin's natural plasticity and controlled firing behavior, yields robust ceramic bodies with superior glaze adhesion and reduced defects.

For paper coating, high-resistivity kaolin delivers a flawlessly smooth surface that enhances printability, opacity, and brightness. Its fine particle size and characteristic platelet morphology enable excellent dispersion and coverage, resulting in paper with outstanding ink holdout and reflectance. The mineral's chemical inertness guarantees compatibility with a wide range of coating formulations, making it a versatile and reliable raw material for paper manufacturers.

In summary, high-resistivity kaolin is an indispensable raw material for producing high‑quality ceramic glazes and premium coated papers. Its unique combination of electrical, physical, and chemical properties directly contributes to enhanced product performance and manufacturing efficiency. Contact our team today to discover how our high-resistivity kaolin can optimize your industrial processes.

Key Properties and Benefits of Calcined Kaolin

• High Electrical Resistivity: Prevents current leakage during ceramic firing, ensuring glaze integrity and uniform surface finish.
• Fine Particle Size: Platelet morphology (average 2–5 µm) enables tight packing and superior coverage in paper coatings.
• Chemical Inertness: Stable across pH ranges, compatible with diverse coating chemistries and glaze formulations.
• Excellent Whiteness & Brightness: 90‑97% whiteness (ISO) delivers outstanding opacity and print contrast in paper.
• Controlled Plasticity: Optimal rheology for ceramic body forming and glaze suspension, reducing processing defects.
• Low LOI (Loss on Ignition): Minimal weight loss during calcination, ensuring consistent fired properties.

These attributes make our high-resistivity kaolin the preferred choice for manufacturers who demand consistency, performance, and cost‑effectiveness in their production lines.

Applications in the Ceramic Industry

In ceramic glaze formulations, high-resistivity kaolin functions both as a flux and a structural component. Its electrical resistivity prevents micro‑arcing during fast‑fire cycles, eliminating pinholes and surface blemishes. The kaolin’s plasticity improves the green strength of unfired glazes, reducing chipping and cracks. When fired, it contributes to a durable, glossy surface that withstands thermal shock and chemical attack. Typical applications include sanitaryware, tableware, floor and wall tiles, and art ceramics.

As a body additive, kaolin enhances the mechanical strength of ceramic bodies by filling interparticle voids and promoting mullite formation. This results in lower water absorption, higher modulus of rupture, and improved dimensional stability. Our high-resistivity grade is particularly suited for electrical insulators and high‑voltage components, where consistent resistivity is critical.

Applications in Paper Coating

For the paper industry, high-resistivity kaolin is a premium coating pigment that delivers exceptional printability. Its platelet structure aligns during coating application, creating a micro‑smooth surface that maximizes gloss and ink holdout. This leads to sharper print detail, higher color gamut, and reduced ink consumption. The kaolin’s high whiteness (GE brightness ≥90%) enhances the paper’s perceived quality, especially for fine art papers, magazines, and packaging.

Furthermore, the kaolin’s low abrasivity minimizes wear on coating blades and doctor blades, extending equipment life. Its chemical stability ensures compatibility with latex binders, optical brighteners, and sizing agents, making formulation adjustments simple. Paper producers benefit from consistent runnability, reduced coating defects, and the ability to meet tight end‑use specifications.

Beyond standard coated paper, our kaolin is also used in ink‑jet papers, thermal paper, and specialty grades where surface smoothness and ink receptivity are paramount.

Product Parameters and Quality Assurance

All batches undergo rigorous quality control including particle size analysis (laser diffraction), whiteness measurement (ISO 2470), resistivity testing (ASTM D257), and chemical composition analysis (XRF). Our kaolin is certified to meet both industrial and cosmetics grade standards, with custom packaging and specification adjustments available upon request.

We offer flexible packaging from 5‑25 kg bags to large bulk orders, with a minimum order quantity of just 1 kg for sample evaluation. Contact our sales team to request a technical datasheet or to discuss your specific application requirements.