Chromium

Superiority:

Product Name:    Chromium
Synonyms:    ChroMiuM powder, APS <10 Micron, 99.2% (Metals basis);Chromium ICP Std.;Chromium, Chips 3-6mm Thick 99.99%;ChroMiuM solution;ChroMiuM(VI) standard;Chromium pieces, electrolytic, 6mm & down, Puratronic, 99.997% (metals basis);LANTHANUM 1,000PPM FOR ICP;Chromium chips, 99.995% trace metals basis
CAS:    7440-47-3
MF:    Cr
MW:    52
EINECS:    231-157-5
Product Categories:    Reagent Grade;Metals;Inorganics;Catalysis and Inorganic Chemistry;Chemical Synthesis;Chromium;ChromiumMetal and Ceramic Science;Metal and Ceramic Science;ChromiumEssential Chemicals;Reagent Plus;Routine Reagents;metal or element
Mol File:    7440-47-3.mol
Chromium Structure
Chromium Chemical Properties
Melting point     1857 °C (lit.)
Boiling point     2672 °C (lit.)
density     7.14 g/mL at 25 °C (lit.)
Fp     50 °F
storage temp.     no restrictions.
form     powder
Specific Gravity    7.2
color     Silver-gray
Odor    Odorless
PH    <1 (H2O, 20°C)
resistivity    12.7 μΩ-cm, 20°C
Water Solubility     Insoluble in water.
Merck     13,2252
Exposure limits    TLV-TWA: chromium metal 0.5 mg/m3 (ACGIH and MSHA), 1 mg/m3 (OSHA); Cr(II) and Cr(III) compounds 0.5 mg/m3 (ACGIH); Cr(VI) compounds, water soluble and certain water insoluble, 0.05 mg/m3 (ACGIH).
Stability:    Stable. Incompatible with carbonates, strong bases, mineral acids, lithium, sulfur dioxide, strong acids.
CAS DataBase Reference    7440-47-3(CAS DataBase Reference)
IARC    3 (Vol. Sup 7, 49) 1990
NIST Chemistry Reference    Chromium(7440-47-3)
EPA Substance Registry System    Chromium (7440-47-3)
Safety Information
Hazard Codes     F,C,Xn,Xi
Risk Statements     11-20/21/22-34-40-23-67-36
Safety Statements     16-26-36/37/39-45-36/37-27
RIDADR     UN 2924 3/PG 2
WGK Germany     3
RTECS     GB4200000
Autoignition Temperature    580°C
TSCA     Yes
HS Code     8112 21 90
HazardClass     4.1
PackingGroup     III
Hazardous Substances Data    7440-47-3(Hazardous Substances Data)
Toxicity    Elemental chromium and certain chromium compounds have been designated as carcinogens, hazardous substances, hazardous waste constituents, and priority toxic pollutants. Some of those compounds designated as hazardous are chromic acetate, chromic acid, chromic sulfate, and chromous chloride. Although chromium in the 6+ state is regarded as being the most carcinogenic, there are 6+ compounds that appear to be non-carcinogenic. In addition to their possible carcinogenicity, chromium compounds may have local allergic effects leading to dermatitis. Systemically, 6+ chromium compounds are irritants to the respiratory system and may give rise to pulmonary edema.