Description

Pyrophyllite is a naturally occurring hydrous aluminum silicate mineral valued for its unique combination of thermal stability, low thermal expansion, and chemical inertness. This makes it a critical functional filler and raw material in numerous high-temperature and refractory applications. Industries such as ceramics, refractories, foundry, and construction rely on its consistent performance to enhance product durability and process efficiency.

Application

• Refractory Products: A key component in the manufacture of firebricks, castables, and insulating materials due to its high melting point and stability.
• Ceramics & Porcelain: Used as a filler in ceramic bodies, sanitaryware, and electrical porcelain to reduce shrinkage and improve thermal shock resistance.
• Foundry Mold Coatings: Acts as a parting agent and refractory coating in metal casting to improve surface finish and mold release.
• Construction Materials: Incorporated into joint compounds, sealants, and roofing materials for its filler and reinforcing properties.
• Paints & Coatings: Serves as an extender pigment to improve durability, weather resistance, and sheen control.
• Plastics & Rubber: Functions as a reinforcing filler to enhance dimensional stability and heat resistance in composite materials.
• Insecticide Carriers: Utilized as an inert carrier or diluent in agricultural and horticultural pesticide formulations.
• Personal Care: Used as an absorbent and texture modifier in cosmetics such as powders and foundations.

Basic Information

Product Name	Pyrophyllite
CAS No.	12269-78-2
Molecular Formula	Al2Si4O10(OH)2
Molecular Weight	360.31 g/mol
Synonyms	Agalmatolite; Pyrauxite; Mineral White; Keystoneite; Pagodite; Wonderstone; Pyrophyllite Clay; Aluminum Silicate Hydroxide
EINECS	235-552-3

Quality Control

Our Pyrophyllite is sourced and processed under strict quality protocols to ensure batch-to-batch consistency for industrial applications. Quality is verified through a series of tests including chemical composition analysis, particle size distribution, and loss on ignition. While we supply various industrial and technical grades, Certificates of Analysis (COA) are available upon request to confirm compliance with your specific requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. As a mineral product, it is generally stable but should be protected from excessive moisture to prevent caking.

Specification

Item	Specification
Appearance	White to pale green fine powder
Assay (as Al2O3 + SiO2)	≥ 85.0 %
Aluminum Oxide (Al2O3)	25.0 - 30.0 %
Silicon Dioxide (SiO2)	60.0 - 70.0 %
Loss on Ignition (LOI)	4.0 - 7.0 %
Particle Size (325 mesh residue)	≤ 5.0 %
Moisture Content	≤ 1.5 %
pH (10% slurry)	6.0 - 8.0

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.