Description

Magnesium Hydroxide Carbonate, Heavy is a high-density, basic magnesium salt with a complex chemical structure. This compound is valued for its superior thermal stability and flame-retardant properties, making it a critical functional additive in polymer and rubber formulations. It serves as a key raw material for manufacturers in the plastics, flame retardancy, and pharmaceutical industries seeking a reliable, high-purity source.

Application

• As a highly effective flame retardant and smoke suppressant in PVC, polyolefins, and various rubber compounds.
• As a precursor for high-purity magnesium oxide production through controlled thermal decomposition.
• As an acid neutralizer and stabilizer in polymer processing to improve thermal stability.
• In the formulation of antacids and pharmaceutical intermediates where high purity is essential.
• As a functional filler in specialty coatings, sealants, and adhesives to modify rheology and properties.
• In environmental applications for wastewater treatment as a neutralizing agent for acidic effluents.

Basic Information

Product Name	Magnesium Hydroxide Carbonate, Heavy
CAS No.	12125-28-9
Molecular Formula	Approx. xMgCO₃·yMg(OH)₂·zH₂O
Molecular Weight	Varies by composition
Synonyms	Basic Magnesium Carbonate; Hydromagnesite; Magnesium Carbonate Hydroxide; Heavy Magnesium Carbonate; Magnesium Hydroxide Carbonate (Heavy); Magnesium Carbonate, Basic; Magnesium Hydrogen Carbonate Hydroxide; CAS 12125-28-9
EINECS	235-192-7

Quality Control

Our Magnesium Hydroxide Carbonate, Heavy is manufactured under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure consistent chemical composition, physical properties, and performance characteristics. Certificates of Analysis (COA) detailing assay, impurity profiles, and physical specifications are available for every shipment to guarantee traceability and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after initial use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	White, fine powder
Identification (IR)	Conforms
Assay (as MgO)	40.0 - 45.0 %
Loss on Ignition	50.0 - 55.0 %
Acid Insoluble Matter	≤ 0.05 %
Chloride (Cl)	≤ 0.01 %
Sulfate (SO₄)	≤ 0.02 %
Heavy Metals (as Pb)	≤ 10 ppm
Iron (Fe)	≤ 50 ppm
Calcium (Ca)	≤ 0.2 %
Bulk Density	0.3 - 0.6 g/mL
Particle Size (D50)	Contact for details

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