*** CHEMICAL IDENTIFICATION ***

RTECS NUMBER            : OM2470000
CHEMICAL NAME           : Magnesium(II) carbonate (1:1)
CAS REGISTRY NUMBER     : 546-93-0
OTHER CAS REGISTRY NOS. : 183480-27-5
                          1784-39-0
LAST UPDATED            : 199712
DATA ITEMS CITED        : 23
MOLECULAR FORMULA       : C-O3.Mg
MOLECULAR WEIGHT        : 84.32
WISWESSER LINE NOTATION :  MG  C-O3
COMPOUND DESCRIPTOR     : Agricultural Chemical
SYNONYMS/TRADE NAMES :
   * Apolda
   * Carbonate magnesium
   * Carbonic acid, magnesium salt
   * C.I. 77713
   * DCI light magnesium carbonate
   * Destab
   * Gold Star (carbonate)
   * GP 20 (carbonate)
   * Hydromagnesite
   * Kimboshi
   * MA 70 (carbonate)
   * Magmaster
   * Magnesite
   * Stan-mag magnesium carbonate

                              *** REVIEWS ***
 
   ACGIH TLV-TWA 10 mg/m3, total dust
   DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices
   (BEIs) booklet issues by American Conference of Governmental Industrial
   Hygienists (ACGIH), Cincinnati, OH, 1996  Volume(issue)/page/year:
   TLV/BEI,1997

                    *** U.S. STANDARDS AND REGULATIONS ***
 
   MSHA STANDARD:NUISANCE PARTICULATES
   DTLWS* "Documentation of the Threshold Limit Values for Substances in
   Workroom Air," Supplements. For publisher information, see 85INA8.
   Volume(issue)/page/year: 3,21,1973

   OSHA PEL (Gen Indu):8H TWA 15 mg/m3, total dust
   CFRGBR Code of Federal Regulations.  (U.S. Government Printing Office, Supt.
   of Documents, Washington, DC 20402)  Volume(issue)/page/year:
   29,1910.1000,1994

   OSHA PEL (Gen Indu):8H TWA 5 mg/m3, respirable fraction
   CFRGBR Code of Federal Regulations.  (U.S. Government Printing Office, Supt.
   of Documents, Washington, DC 20402)  Volume(issue)/page/year:
   29,1910.1000,1994

   OSHA PEL (Construc):8H TWA 15 mg/m3, total dust
   CFRGBR Code of Federal Regulations.  (U.S. Government Printing Office, Supt.
   of Documents, Washington, DC 20402)  Volume(issue)/page/year:
   29,1926.55,1994

   OSHA PEL (Construc):8H TWA 5 mg/m3, respirable fraction
   CFRGBR Code of Federal Regulations.  (U.S. Government Printing Office, Supt.
   of Documents, Washington, DC 20402)  Volume(issue)/page/year:
   29,1926.55,1994

   OSHA PEL (Shipyard):8H TWA 15 mg/m3, total dust
   CFRGBR Code of Federal Regulations.  (U.S. Government Printing Office, Supt.
   of Documents, Washington, DC 20402)  Volume(issue)/page/year:
   29,1915.1000,1993

   OSHA PEL (Shipyard):8H TWA 5 mg/m3, respirable fraction
   CFRGBR Code of Federal Regulations.  (U.S. Government Printing Office, Supt.
   of Documents, Washington, DC 20402)  Volume(issue)/page/year:
   29,1915.1000,1993

                    *** OCCUPATIONAL EXPOSURE LIMITS ***
 
   OEL-AUSTRALIA:TWA 10 mg/m3 JAN 1993
   
   OEL-BELGIUM:TWA 10 mg/m3 JAN 1993
   
   OEL-FRANCE:TWA 10 mg/m3 JAN 1993
   
   OEL-RUSSIA:STEL 10 mg/m3 JAN 1993
   
   OEL-SWITZERLAND:TWA 6 mg/m3 JAN 1993
   
   OEL-UNITED KINGDOM:TWA 10 mg/m3 JAN 1993
   
   OEL IN BULGARIA, COLOMBIA, JORDAN, KOREA check ACGIH TLV
   
   OEL IN NEW ZEALAND, SINGAPORE, VIETNAM check ACGIH TLV

         *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA ***

NIOSH RECOMMENDED EXPOSURE LEVEL (REL) :
   NIOSH REL TO MAGNESITE, respirable fraction-air:10H TWA 5 mg/m3
REFERENCE :
   NIOSH* National Institute for Occupational Safety and Health, U.S. Dept. of
   Health, Education, and Welfare, Reports and Memoranda.
   Volume(issue)/page/year: DHHS #92-100,1992

NIOSH RECOMMENDED EXPOSURE LEVEL (REL) :
   NIOSH REL TO MAGNESITE, total dust-air:10H TWA 10 mg/m3
REFERENCE :
   NIOSH* National Institute for Occupational Safety and Health, U.S. Dept. of
   Health, Education, and Welfare, Reports and Memoranda.
   Volume(issue)/page/year: DHHS #92-100,1992

NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA :
   NOHS - National Occupational Hazard Survey (1974)
     NOHS Hazard Code - M2283
       No. of Facilities: 810 (estimated)
       No. of Industries: 16
       No. of Occupations: 20
       No. of Employees: 11547 (estimated)
   
   NOHS - National Occupational Hazard Survey (1974)
     NOHS Hazard Code - 80144
       No. of Facilities: 8724 (estimated)
       No. of Industries: 81
       No. of Occupations: 92
       No. of Employees: 104149 (estimated)
   
   NOES - National Occupational Exposure Survey (1983)
     NOES Hazard Code - 80144
       No. of Facilities: 19943 (estimated)
       No. of Industries: 134
       No. of Occupations: 128
       No. of Employees: 348034 (estimated)
       No. of Female Employees: 53547 (estimated)

                          *** STATUS IN U.S. ***
 
   EPA TSCA Section 8(b) CHEMICAL INVENTORY
   
   EPA TSCA TEST SUBMISSION (TSCATS) DATA BASE, JUNE 1998

 
                            *** END OF RECORD ***