*** CHEMICAL IDENTIFICATION ***

RTECS NUMBER            : MG4600000
CHEMICAL NAME           : Hafnium
CAS REGISTRY NUMBER     : 7440-58-6
LAST UPDATED            : 199712
DATA ITEMS CITED        : 23
MOLECULAR FORMULA       : Hf
MOLECULAR WEIGHT        : 178.49
SYNONYMS/TRADE NAMES :
   * Hafnium

                              *** REVIEWS ***
 
   ACGIH TLV-TWA 0.5 mg/m3
   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

   TOXICOLOGY REVIEW
   IHFMAU Industrial Hygiene Foundation of America, Medical Series, Bulletin.
   (Pittsburgh, PA)  No.1-17, 1937-70.  Discontinued. Volume(issue)/page/year:
   -,-,1954

                    *** U.S. STANDARDS AND REGULATIONS ***
 
   MSHA STANDARD-air:TWA 0.5 mg/m3
   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:
   3,123,1971

   OSHA PEL (Gen Indu):8H TWA 0.5 mg/m3
   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 0.5 mg/m3
   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 0.5 mg/m3
   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 (Fed Cont):8H TWA 0.5 mg/m3
   CFRGBR Code of Federal Regulations.  (U.S. Government Printing Office, Supt.
   of Documents, Washington, DC 20402)  Volume(issue)/page/year:
   41,50-204.50,1994

                    *** OCCUPATIONAL EXPOSURE LIMITS ***
 
   OEL-AUSTRALIA:TWA 0.5 mg/m3 JAN 1993
   
   OEL-BELGIUM:TWA 0.5 mg/m3 JAN 1993
   
   OEL-DENMARK:TWA 0.5 mg/m3 JAN 1993
   
   OEL-FINLAND:TWA 0.5 mg/m3 JAN 1993
   
   OEL-FRANCE:TWA 0.5 mg/m3 JAN 1993
   
   OEL-GERMANY:TWA 0.5 mg/m3 JAN 1993
   
   OEL-THE NETHERLANDS:TWA 0.5 mg/m3 JAN 1993
   
   OEL-THE PHILIPPINES:TWA 0.5 mg/m3 JAN 1993
   
   OEL-SWITZERLAND:TWA 0.5 mg/m3 JAN 1993
   
   OEL-UNITED KINGDOM:TWA 0.5 mg/m3;STEL 1.5 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 HAFNIUM-air:10H TWA 0.5 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 OCCUPATIONAL EXPOSURE SURVEY DATA :
   NOHS - National Occupational Hazard Survey (1974)
     NOHS Hazard Code - 35755
       No. of Facilities: 331 (estimated)
       No. of Industries: 16
       No. of Occupations: 16
       No. of Employees: 3335 (estimated)
   
   NOES - National Occupational Exposure Survey (1983)
     NOES Hazard Code - 35755
       No. of Facilities: 3 (estimated)
       No. of Industries: 1
       No. of Occupations: 7
       No. of Employees: 1004 (estimated)
       No. of Female Employees: 3 (estimated)

                          *** STATUS IN U.S. ***
 
   EPA TSCA Section 8(b) CHEMICAL INVENTORY

 
                            *** END OF RECORD ***