Molecule structure of Cobalt-beryllium copper (CAS NO.55158-44-6):

IUPAC Name: Beryllium; cobalt; copper 
Molecular Weight: 131.491382 g/mol
Molecular Formula: BeCoCu
Exact Mass: 130.874983
MonoIsotopic Mass: 130.874983
Heavy Atom Count: 3
Canonical SMILES: [Be].[Co].[Cu]
InChI: InChI=1S/Be.Co.Cu
InChIKey: WJUQEHIOSQMNMB-UHFFFAOYSA-N
Classification Code of Cobalt-beryllium copper (CAS NO.55158-44-6): Tumor data

IARC Cancer Review: Group 1 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 58 , 1993,p. 41.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Sufficient Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 58 , 1993,p. 41.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 1 , 1972,p. 17.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 23 , 1980,p. 143.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 58 , 1993,p. 41.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . Copper, cobalt, and beryllium and their compounds are on the Community Right-To-Know List.

Confirmed carcinogen. See COPPER, BERYLLIUM, and COBALT COMPOUNDS. When heated to decomposition it emits very toxic fumes of BeO.

OSHA PEL: TWA 0.002 mg(Be)/m³; STEL 0.005 mg(Be)/m³/30M; CL 0.025 mg(Be)/m³
ACGIH TLV: TWA 0.002 mg(Be)/m³; Confirmed Human Carcinogen; (Proposed: TWA 0.0002 mg(Be)/m³ (sensitizer); Confirmed Human Carcinogen)
NIOSH REL: (Beryllium) CL not to exceed 0.0005 mg(Be)/m³; (Cobalt) Insufficient evidence for recommending limit

 Cobalt-beryllium copper (CAS NO.55158-44-6) is also named as Beryllium-copper-cobalt alloy ; Copper alloy, Cu,Be,Co .