Description

Colemanite (Ca2B6O11·5H2O) is a naturally occurring hydrated calcium borate mineral, a vital source of boron for industrial applications. Its controlled composition and consistent quality make it a critical raw material for manufacturing high-performance, boron-based products. This mineral is essential for industries requiring a reliable and economical supply of boron, such as glass, ceramics, agriculture, and flame retardants.

Application

• Glass & Fiberglass Manufacturing: A key fluxing agent and source of boron trioxide (B2O3) to improve thermal shock resistance, chemical durability, and lower melting temperatures in borosilicate glass and insulation fiberglass.
• Ceramics & Enamels: Used as a flux to lower vitrification temperatures, enhance glaze fit, and improve the mechanical strength and surface finish of ceramic bodies and porcelain enamels.
• Flame Retardants & Additives: Serves as a source of boron for zinc borates and other compounds used as smoke suppressants and char-forming agents in polymers, textiles, and coatings.
• Agriculture (Micronutrient Fertilizers): Provides a slow-release source of the essential micronutrient boron for correcting deficiencies in crops, promoting healthy growth and yield.
• Metallurgy & Welding Fluxes: Employed in fluxes for brazing and welding to dissolve metal oxides, improve wetting, and protect the molten weld pool.
• Wood Treatment & Preservation: A component in formulations for protecting wood against fungal decay and insect damage.
• Detergents & Cleaning Agents: Utilized as a water-softening agent and bleach stabilizer in certain industrial and institutional cleaning formulations.
• Nuclear Shielding: Due to boron's high neutron absorption cross-section, colemanite can be incorporated into concrete and other materials for radiation shielding.

Basic Information

Product Name	Colemanite
CAS No.	1318-33-8
Molecular Formula	Ca2B6O11·5H2O
Molecular Weight	411.09 g/mol (Anhydrous: 321.02 g/mol)
Synonyms	Calcium Borate Hydrate; Calcium Hexaborate Pentahydrate; Diboron Calcium Oxide Hydrate; Natural Calcium Borate; Boron Ore; Colemanite Ore; 2CaO·3B2O3·5H2O
EINECS	215-286-5

Quality Control

Our Colemanite is sourced and processed to meet stringent quality parameters for industrial use. We employ rigorous in-process and batch testing to ensure consistent chemical composition, particle size distribution, and low impurity levels. While typically supplied as a technical-grade mineral, specifications for B2O3 content, CaO, moisture, and screen analysis are strictly controlled. A Certificate of Analysis (COA) detailing lot-specific results is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep containers tightly sealed to minimize exposure to atmospheric moisture. Store away from incompatible materials such as strong acids.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or granules
Identification (XRD)	Complies (Positive for Colemanite)
Boron Trioxide (B2O3) Content	≥ 48.0 %
Calcium Oxide (CaO) Content	≥ 26.0 %
Moisture (Loss on Drying)	≤ 2.0 %
Particle Size (Passing 100 Mesh)	≥ 95 %
Acid Insolubles	≤ 3.0 %
Heavy Metals (as Pb)	≤ 20 ppm

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