Kaolin Clay For Sale: Calcined Kaolin Clay 325mesh for Ceramic/Paints

I’ve toured clay processors from Hebei to Hamburg, and—honestly—calcined kaolin is back in the spotlight. Painters want better opacity without blowing the TiO2 budget, ceramic plants want cleaner bodies with tighter firing windows, and refractories…well, they always want more heat resistance. From 368 Youyi North Street, Shijiazhuang, Hebei, China, this lot checks the boxes: clean chemistry, tight particle control, and consistent brightness. If you’re scouting Kaolin Clay For Sale, read on; there’s more to it than “white powder in a bag.”

What’s In The Bag (and Why It Matters)

This calcined grade is a kaolinite-rich blend—kaolinite, halloysite traces, hydromica/illite, with accessory quartz and feldspar—fired to drive off structural water, then milled to ≈325 mesh. The result: low LOI, crisp brightness, and a hard-structured pigment that punches above its weight in paints and ceramics. Many customers say it “feels” cleaner during slurry prep—less froth, easier dispersing.

Typical Product Specs (real‑world use may vary)

Product	Calcined Kaolin Clay 325mesh
Mesh / PSD	325 mesh; D50 ≈ 1–2.5 μm (ISO 13320)
Brightness (ISO)	≈ 90–93
Fe2O3	≈ 0.3–0.7%
Al2O3 / SiO2	Al2O3 ≈ 37–40%; SiO2 ≈ 50–55%
Loss on Ignition	≤ 1.5% (calcined)
Moisture	≤ 0.8%
pH	≈ 5.5–7.0 (ISO 787)
Packaging	25 kg bags / 1 MT jumbo; palletized

Quick QC snapshot (example): brightness 92±1 ISO; residue on 325 mesh ≤0.1%; oil absorption ≈ 38–42 g/100g. Tested with ISO 787 methods and laser diffraction per ISO 13320. To be honest, these are the numbers I expect when I see premium Kaolin Clay For Sale.

Process Flow & Testing

Materials: selected kaolin ore → beneficiation (screening, hydrocyclone, magnetic separation) → calcination ≈ 950–1050°C → micronization (325 mesh) → dust control blending → bagging. Methods: PSD by laser diffraction; whiteness/brightness by ISO 787; Fe2O3 via XRF; LOI by 1000°C furnace; PCE for refractoriness (ASTM C24). Service life? It’s a function of the host system: ceramic bodies show improved whiteness retention and reduced warpage; in coatings, film durability depends on binder but opacity gains are noticeable.

Applications & Advantages

Ceramics: cleaner biscuit, improved plasticity, controlled vitrification; tiles, sanitaryware, tableware.
Paints/Coatings: TiO2 extension, sheen control, scrub resistance; primers and architectural mattes love it.
Refractories: boosts aluminosilicate balance for kiln furniture, insulating parts.
Rubber/Plastics: reinforcement and whiteness without heavy density penalties.

Trend watch: buyers pivot to calcined grades to stabilize gloss and reduce TiO2 volatility. Also, ESG reporting pushes vendors with ISO 9001/14001 and REACH compliance.

Vendor Comparison (indicative)

Vendor	Type	Brightness	Fe2O3	Lead Time	Certs
GloryStar Export (Hebei)	Calcined, 325 mesh	≈ 90–93	≈ 0.3–0.7%	2–4 weeks	ISO 9001; REACH-ready
Vendor A (EU)	Calcined, fine PSD	≈ 91–94	≈ 0.2–0.5%	4–6 weeks	ISO 9001/14001
Vendor B (US)	Hydrous (control)	≈ 86–90	≈ 0.5–1.0%	2–5 weeks	ISO 9001

Note: specs are indicative; request a current COA. For bulk buyers comparing Kaolin Clay For Sale, brightness and Fe2O3 tend to drive price.

Customization & Real-world Cases

Customization: tuned PSD (D50 1.0–2.5 μm), surface treatment for polymer compatibility, moisture targets for spray-drying lines, and packaging (anti-caking liners). Many plants ask for tighter iron control when pushing high-whiteness porcelain—reasonable request.

Case #1 — Tile plant: a mid-size ceramic factory swapped in this calcined grade at 8–12% of the body. They reported smoother casting and a small but visible increase in fired whiteness; scrap down ≈ 3% month-over-month. Not miraculous, just steady gains.

Case #2 — Architectural primer: a paint maker used it to partially replace TiO2 (≈10–15% substitution). Opacity held, sheen evened out, and the cost per liter dropped. Field feedback said “less flashing” on large walls—always nice.

Standards, Compliance, and Ordering

Test methods: ISO 787 (general pigments), ISO 13320 (particle size), ASTM C24 (refractoriness/PCE), and GB/T 14563 (kaolin). Compliance: ISO 9001 QMS; REACH pre-check; RoHS on request. To source Kaolin Clay For Sale efficiently, align your COA with these standards and lock PSD and brightness tolerances in the PO.