Synonyms: Carbonate magnesium; Hydromagnesite; Magnesium carbonate; Magnesium(II) carbonate; Magnesium (II) carbonate (1:1); Carbonic acid, magnesium salt (1:1)

OSHA IMIS Code Number: 1615

Chemical Abstracts Service (CAS) Registry Number: 13717-00-5

Other Chemical Abstracts Service (CAS) Registry Number: 546-93-0 (Magnesium carbonate)

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: OM2470000

NIOSH Pocket Guide to Chemical Hazards, Magnesite: chemical description, physical properties, potentially hazardous incompatibilities, and more

OSHA Permissible Exposure Limit (PEL):

General Industry: 29 CFR 1910.1000 Z-1 Table - 15 mg/m³ TWA

Maritime: 29 CFR 1915.1000 Table Z-Shipyards - 15 mg/m³ TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 10 mg/m³ TWA; The value is for particulate matter containing no asbestos and <1% crystalline silica.

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 mg/m³ TWA

Potential Symptoms: Irritation of eyes, skin, respiratory system, cough.

Health Effects: Nuisance particulate-Accumulation in lungs (HE19)

Affected Organs: Eyes, skin, respiratory system

Notes:

1. Magnesium carbonate is listed as a direct food substance affirmed by the FDA as GRAS (generally recognized as safe) when used in food with good manufacturing practice (21 CFR 184.1425).
2. Magnesium carbonate is a component of several oral antacid medications.

Literature Basis:

• NIOSH Pocket Guide to Chemical Hazards: Magnesite.
• International Chemical Safety Cards (WHO/IPCS/ILO): Magnesium carbonate.

Date Last Revised: 10/05/2005

Primary Laboratory Sampling/Analytical Method (SLC1):

• See Particulates not otherwise regulated (Total Dust)
  

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