Description

Sillimanite is a naturally occurring aluminum silicate mineral valued for its exceptional high-temperature stability and chemical inertness. This makes it a critical raw material in the production of advanced refractory ceramics and foundry molds that must withstand extreme thermal and mechanical stress. Key industries that rely on this material include refractory manufacturing, investment casting, and the production of high-alumina ceramics for metallurgical, glass, and cement kiln applications.

Application

• Manufacturing of high-performance refractory bricks, shapes, and monolithic linings for furnaces, kilns, and ladles.
• Production of ceramic cores and molds for the investment casting of superalloy turbine blades and other precision metal parts.
• Key component in high-alumina ceramics for technical applications requiring thermal shock resistance.
• Used in the production of insulating materials and kiln furniture (e.g., setters, saggers).
• As a source of alumina and silica in the manufacture of glass and enamel frits.
• Potential filler material in specialty composites and coatings.

Basic Information

Product Name	Sillimanite
CAS No.	12141-45-6
Molecular Formula	Al2SiO5
Molecular Weight	162.05 g/mol
Synonyms	Fibrolite; Aluminum Silicate (Al2SiO5); Sillimanite Mineral; Andalusite Group Mineral; Aluminosilicate; Kyanite-Sillimanite; Al2O3·SiO2
EINECS	235-253-8

Quality Control

Our Sillimanite is sourced and processed to meet stringent quality parameters for industrial applications. Quality is assured through rigorous batch testing for key parameters such as chemical composition (Al2O3 and SiO2 content), particle size distribution, and bulk density. A Certificate of Analysis (COA) detailing these specifications is provided with every shipment to ensure consistency and performance reliability for our customers.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at ambient temperature (15-25°C). Keep away from incompatible strong acids and fluorides/strong alkalis. The material is not hygroscopic under normal conditions but should be protected from excessive moisture to prevent caking.

Specification

Item	Specification
Appearance	White to greyish-white powder or granular solid
Aluminum Oxide (Al2O3) Content	≥ 58.0 %
Silicon Dioxide (SiO2) Content	≤ 40.0 %
Iron Oxide (Fe2O3) Content	≤ 1.5 %
Loss on Ignition (LOI)	≤ 1.0 %
Bulk Density	Contact for details
Particle Size Distribution	Customizable (various mesh sizes available)

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