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CAS No 7440-47-3 , chromium

  • Name: chromium
  • Synonyms: 7440-47-3; Chrome [French]; Chrom; Chromium compounds; metal; Chromium;Chrome; Chrom [German];chromium; Chromium metal;
  • CAS Registry Number:
  • Transport: UN 2924 3/PG 2
  • Melting Point: 1890 ºC
  • Boiling Point: 2200 ºC
  • Water Solubility: Insoluble in water
  • Safety Statements: R40
  • Hazard Symbols: Xn: Harmful;
  • EINECS: 231-157-5
  • Molecular Weight: 51.9961
  • InchiKey: VYZAMTAEIAYCRO-UHFFFAOYSA-N
  • InChI: InChI=1S/Cr
  • Risk Statements: S36/37;S45
  • Molecular Formula: Cr
  • Molecular Structure:CAS No:7440-47-3 chromium
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7440-47-3 Chromium, lump, electrolytic, 99,5%

  • Chromium, lump, electrolytic, 99,5%
  • Belgium Alkemi [Manufacturer]
  • Tel: +32 9 340 49 49
  • Fax: +32 9 340 49 47
  • Address: Poststraat, 82 B-9160 Lokeren Belgium ,Belgium
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7440-47-3 CHROMIUM SPUTTERING TARGET 50.8MM (2.0IN) DIA X 6.35MM (0.250IN) THICK

  • CHROMIUM SPUTTERING TARGET 50.8MM (2.0IN) DIA X 6.35MM (0.250IN) THICK, 99.98% (METALS BASIS)
  • United States INTERNATIONAL LABORATORY LIMITED [Manufacturer]
  • Tel: ( 650 ) 278-9963
  • Fax: ( 650 ) 589-2786
  • Address: 1067 SNEATH LN SAN BRUNO CA 94066, USA SAN BRUNOUNITED STATES SAN BRUNO,United States
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7440-47-3 Chromium

  • China Hangzhou Sage Chemical Co., Ltd. [, Manufacturer]
  • Tel: +86-571-86818502
  • Fax: +86-571-86818503
  • Address: RM501 Tower A, New Youth Plaza, NO.8 Jia Shan Road, Hangzhou, Zhejiang 310014, ,ZhejiangChina
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7440-47-3 CHROMIUM

  • Germany Cfm Oskar Tropitzsch [Manufacturer]
  • Tel: +49-9231-9619-0
  • Fax: +49-9231-9619-60
  • Address: Cfm Oskar Tropitzsch
    Waldershofer Str. 49-51
    95615 Marktredwitz
    Germany ,Germany
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7440-47-3 Chromium Powder

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7440-47-3 Chromium(III) atomic absorption standard solution

  • Hong kong ADVANCED TECH. & IND. CO., LTD. [Distributor/Wholesaler]
  • Tel: 86-23902293
  • Fax: 86-27898314
  • Address: UNIT B, 1/F, CHEONG SHING IND. BLDG., 17 WALNUT ST., TAI KOK TSUI, KLN, HONG KONG Hong Kong,nilHong kong
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7440-47-3 Chromium

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7440-47-3 Chromium

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7440-47-3 Chromium crystallites

  • Chromium crystallites, (99.996%)
  • United States Strem Chemicals, Inc. [Manufacturer]
  • Tel: (978) 499-1600/ (800) 647-8736
  • Fax: (978) 465-3104
  • Address: 7 Mulliken Way
    Newburyport, MA 01950-4098 ,United States
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7440-47-3 Chromium Metal

  • Germany Intatrade Chemicals GmbH [Manufacturer]
  • Tel: +49 3493/605464
  • Fax: +49 3493/605470
  • Address: Intatrade Chemicals GmbH
    Vierzoner Strasse 14
    D-06749 Bitterfeld, Germany ,Germany
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References of chromium
Title: Chromium
CAS Registry Number: 7440-47-3
Literature References: Cr; at. wt 51.9961; at. no. 24; valences 1-6. Group VIB (6). Four naturally occurring isotopes: 50 (4.31%); 52 (83.76%); 53 (9.55%); 54 (2.38%). Artificial radioactive isotopes: 45-49; 51; 55-57; longest-lived isotope is 51Cr (T? 27.704 days) prepd by (n,g) reaction from 50Cr. Abundance in earth's crust: 122 ppm. Isoln from crocoite (PbCrO4): L. N. Vauquelin, J. Mines 6, ser. 1, 737 (1787); idem, Ann. 70, 70 (1809). Commercial sources obtained from chrome ore, chromite (FeO.Cr2O3). Reviews of chromium, its alloys and compds: ACS Monograph Series no. 132, entitled "Chromium," M. J. Udy, Ed. (Reinhold, New York, 1956) vol. 1, 433 pp; vol. 2, 402 pp; C. L. Rollinson, "Chromium, Molybdenum and Tungsten" in Comprehensive Inorganic Chemistry vol. 3, J. C. Bailar, Jr. et al., Eds. (Pergamon Press, Oxford, 1973) pp 623-700; Chemistry of the Elements, N. N. Greenwood, A. Earnshaw, Eds. (Pergamon Press, New York, 1984) pp 1167-1210; J. H. Westbrook in Kirk-Othmer Encyclopedia of Chemical Technology vol. 6 (Wiley-Interscience, New York, 4th ed., 1993) pp 228-263; B. J. Page, G. W. Loar, ibid. pp 263-311. Review of biological function of the Cr(III) ion as essential trace element: Mertz, Physiol. Rev. 49, 163-239 (1969). Review of carcinogenic risk: IARC Monographs 2, 100-125 (1973); ibid. 23, 205-323 (1980); of metabolism and toxicity: M. D. Cohen et al., Crit. Rev. Toxicol. 23, 255-281 (1993); of toxicology and human exposure: Toxicological Profile for Chromium (PB2000-108022, 2000) 461 pp. Books: Chromium: Metabolism and Toxicity, D. Burrows, Ed. (CRC Press, Boca Raton, 1983) 172 pp; Chromium in the Natural and Human Environments, J. O. Nriagu, E. Nieboer, Eds. (John Wiley & Sons, New York, 1988) 571 pp.
Properties: Steel-gray, lustrous metal; body-centered cubic structure; hard as corundum and less fusible than platinum. Takes a high polish. mp 1903 ±10°. bp 2642°. d20 7.14. Heat capacity (25°): 5.58 cal/mol/deg C. Heat of fusion: 3.5 kcal/mol; heat of vaporization: 81.7 kcal/mol (at bp); heat of sublimation (25°): 94.8 kcal/mol (Rollinson). Also reported as mp 1875°. bp 2680°. d20 7.19. Specific heat (25° C): 23.9 J/mol/deg K. Heat of fusion: 14.6 kJ/mol; heat of vaporization: 305 kJ/mol (at bp) (Westbrook). Resistant to common corroding agents, highly acid resistant. Reacts with dil HCl, H2SO4; not with HNO3. Resists atmospheric attack at ambient temperatures.
Melting point: mp 1903 ±10°; mp 1875°
Boiling point: bp 2642°; bp 2680°
Density: d20 7.14; d20 7.19
CAUTION: Potential symptom of overexposure to chromium metal by inhalation is histologic fibrosis of the lungs. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 72. Chromic acid and chromate salts are irritating to exposed tissues. Toxic effects due to overexposure may include dermatitis, skin ulcers; nasal inflammation, perforation of nasal septum; cancer of the lungs, nasal cavity and paranasal sinus. See Patty's Industrial Hygiene and Toxicology vol. 2C, G. D. Clayton, F. E. Clayton, Eds. (John Wiley & Sons, New York, 4th ed., 1994) p 1973-1985. Chromium hexavalent compounds are listed as known human carcinogens: Report on Carcinogens, Eleventh Edition (PB2005-104914, 2004) p III-63.
Use: In manuf of chrome-steel or chrome-nickel-steel alloys (stainless steel), nonferrous alloys, heat resistant bricks for refractory furnaces. To greatly increase strength, hardness and resistance of metals to abrasion, corrosion and oxidation. For chrome plating of other metals; leather tanning; as pigment and mordant; wood preservative. Use of 51Cr as diagnostic aid see sodium chromate(VI).