Description

Huntite is a carbonate mineral with the chemical composition CaMg3(CO3)4, valued for its unique combination of properties including whiteness, flame retardancy, and thermal stability. It serves as a high-performance, multi-functional filler and additive across several industrial sectors. Key industries that utilize huntite include polymer composites, paints and coatings, flame retardant formulations, and construction materials.

Application

• Flame Retardant Filler: Used in polyolefins (PP, PE), PVC, rubber, and wire & cable compounds to impart smoke suppression and char formation.
• Polymer Composite Reinforcement: Acts as a functional filler in engineering plastics to improve stiffness, dimensional stability, and heat deflection temperature.
• Paints and Coatings: Provides extender pigment properties, improving whiteness, opacity, and corrosion resistance in industrial and decorative coatings.
• Construction Materials: Incorporated into sealants, adhesives, and cementitious products to enhance fire resistance and mechanical properties.
• Paper and Packaging: Used as a coating pigment to improve brightness, smoothness, and printability with added flame retardant benefits.
• Ceramics and Refractories: Serves as a source of magnesium and calcium oxides, influencing firing behavior and final product properties.

Basic Information

Product Name	Huntite
CAS No.	19569-21-2
Molecular Formula	CaMg3(CO3)4
Molecular Weight	353.04 g/mol
Synonyms	Calcium Magnesium Carbonate; Trimagnesium Calcium Tetracarbonate; Huntite Mineral; Natural Huntite; Hydromagnesite-Huntite Mix; FR-Huntite; White Filler HUN
EINECS	243-181-5

Quality Control

Our Huntite products are subject to a stringent quality management system to ensure batch-to-batch consistency and performance. Key parameters such as chemical composition, particle size distribution (PSD), brightness, and moisture content are rigorously tested. A Certificate of Analysis (COA) detailing these specifications is provided with every shipment to guarantee compliance with your technical 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). The product is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	White fine powder
Assay (as CaMg3(CO3)4)	≥ 95.0 %
Calcium Oxide (CaO) Content	13 - 16 %
Magnesium Oxide (MgO) Content	38 - 42 %
Loss on Ignition (LOI)	40 - 45 %
Moisture Content	≤ 2.0 %
Particle Size (D50)	2 - 10 µm
Brightness (ISO)	≥ 90 %
Oil Absorption	20 - 35 g/100g
pH (10% slurry)	9.0 - 10.5

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