Calcined Kaolin 325 Mesh for Ceramics & Paints — An Insider’s Quick Buyer Guide

If you’re actively hunting Kaolin Clay For Sale, here’s the straight talk from the factory floor and the lab bench. Calcined kaolin (sometimes called “metakaolin” in certain applications) is a non-metallic mineral derived from kaolinite-rich clays—white, delicate, and yes, famously clean. In China, it’s often nicknamed “Baiyun soil.” The pure stuff is soft, plastic when wet, and highly fire-resistant—exactly why ceramic and refractory buyers keep coming back.

Industry trend? Two words: performance substitution. Many coatings producers quietly shave down TiO2 by 3–8% using high-brightness calcined kaolin without wrecking opacity. Ceramics and refractories value the thermal stability and low LOI after calcination. And paper mills—those that still run glossy lines—like its controlled particle size and brightness. Honestly, demand is steady; the smarter buyers are negotiating for tighter PSD and lower Fe2O3, not just chasing price.

Product snapshot: Calcined Kaolin Clay 325mesh In Refractory Price Of Kaolin For Ceramic/Paints

Origin: 368 Youyi North Street, Shijiazhuang, Hebei, China. Many customers say the consistency is the hook—batch-to-batch color is stable, which sounds boring, but in a white glaze or high-SVOC compliant paint, it’s everything.

Parameter	Typical Value (≈, real-world use may vary)
Appearance	Fine white powder
Residue on 325 mesh	≤0.5%
D50 (laser)	≈1.0–1.8 μm
ISO Brightness	≈91–94%
SiO2 / Al2O3	≈52–55% / 36–39%
Fe2O3	≤0.6%
Loss on ignition (1000°C)	≈0.2–1.0%
Oil absorption	≈35–45 g/100 g
pH (slurry)	≈4.5–6.5
Refractoriness (PCE)	SK 33–35 (≈1700°C softening)

Process flow (how it’s actually made)

Materials: kaolinite-rich ore with halloysite/illite traces; low iron quartz/feldspar fractions.
Methods: crushing → attrition milling → hydrocyclone classification → magnetic separation → flotation (as needed) → spray drying → calcination (≈950–1050°C) → 325-mesh milling → laser PSD check.
Testing: ISO 787 series (pigments/extenders), ASTM E11 (sieve residue), ISO 13320 (laser particle size), color per D65/10° metrics; ceramics bodies checked via ASTM C373 water absorption.
Service life: paints 5–10 years exterior (formulation-dependent); ceramic glaze permanence excellent; refractories as filler/back-up layer.
Certifications: ISO 9001:2015 QMS; RoHS/REACH statements available on request.

Where it shines (and why buyers pick it)

Paints & coatings: TiO2 spacing, sheen control, scrub resistance.
Ceramics: whiteware, sanitaryware, glazes; reliable firing and plasticity in blends.
Refractories: lightweight castables, insulating bricks (as filler/alumino-silicate source).
Paper & board: brightness, gloss, ink holdout for specialty grades.
Rubber/plastics: reinforcement, surface smoothness; decent dielectric behavior.

Vendor comparison (quick take)

Vendor	Strengths	Notes
GloryStar (Hebei, CN)	Stable brightness; tight 325-mesh control; responsive OEM packs	Best for paint/ceramic lines needing consistency
Trader A	Lowest price on bulk lots	Spec drift reported by some buyers
Producer B (Specialty)	Ultra-fine PSD, premium brightness	Higher cost; great for TiO2 reduction projects

Case study (real factory, quick numbers)

A Southeast Asia sanitaryware plant swapped 6% TiO2 for calcined kaolin at 2–5 μm D50. Result: ≈5.2% raw material savings, ΔE color shift Kaolin Clay for Sale – High-Purity, Bulk & Wholesale Pricing

Customization & buying tips

Ask for custom PSD cuts (e.g., D90
Request COA with ISO 787 methods and ISO 13320 PSD curves; include whiteness data.
Trial at 3–10% replacement in paints; 10–25% in glaze body; validate with ASTM C373 and color ΔE.

Bottom line: if you need Kaolin Clay For Sale that behaves the same week after week, you’ll want spec discipline and transparent test data more than a rock-bottom quote. Many customers say that’s what keeps their QC managers sleeping at night.