Magnesium carbonate
CAS 546-93-0
EC 208-915-9
Formula CH2O3.Mg
MW 84.31 g/mol
Salts & Minerals Food & NutritionPharmaceuticals & HealthcarePlastics & PolymersPersonal Care & Cosmetics pH Regulation & BufferingAntioxidant & StabilizerPreservation & BiocideCatalysis
Description
Magnesium carbonate (MgCO3, CAS 546-93-0) is an inorganic mineral salt sourced from natural magnesite deposits and available under trade names including Apolda and Kimboshi. It carries no E-number designation in the EU but is recognised under EC number 208-915-9 and HS code 28369910.
In pharmaceutical tablet manufacturing, magnesium carbonate acts as a pH buffer and flow-control agent, neutralising acidic excipients to stabilise active ingredients during compression. In PVC and polymer processing, it functions as a heat stabiliser by scavenging hydrogen chloride released during thermal degradation, slowing chain breakdown at elevated processing temperatures.
Magnesium carbonate is supplied in food-grade, pharmaceutical-grade (Ph.Eur. compliant), and technical grades as a free-flowing white powder. It meets FCC specifications for food-contact applications and is registered under REACH. Standard packaging includes 25 kg bags and bulk quantities for industrial procurement.
In pharmaceutical tablet manufacturing, magnesium carbonate acts as a pH buffer and flow-control agent, neutralising acidic excipients to stabilise active ingredients during compression. In PVC and polymer processing, it functions as a heat stabiliser by scavenging hydrogen chloride released during thermal degradation, slowing chain breakdown at elevated processing temperatures.
Magnesium carbonate is supplied in food-grade, pharmaceutical-grade (Ph.Eur. compliant), and technical grades as a free-flowing white powder. It meets FCC specifications for food-contact applications and is registered under REACH. Standard packaging includes 25 kg bags and bulk quantities for industrial procurement.
Physical Properties
| Melting Point | 990 °C |
| Density | 3.0 g/cm³ |
| Appearance | White or almost white powder. |
| Color | White |
| Odor | at 100.00?%. odorless |
| Form | Solid |
| Water Solubility | g MgCO3/100g solution at CO2 pressure, kPa, 18°C: 3.5 (203), 4.28 (405), 5.90 (1010), 7.49 (1820), 7.49 (5670); at 0°C 8.58 (3445), at 60°C 5.56 (3445); soluble acids; insoluble alcohol [HAW93] [KIR81] |
| Refractive Index | 1.717 |
| Log P | -0.809 (est) |
Trade & Regulatory
| HS Code | 28369910 |
Other Names
MgCO3MagnesiumkarbonatApoldaKimboshiMAGNESITEC.I. 77713barringtonite
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