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Home> Encyclopedia > Hot Product Listed I   > Iron
7439-89-6 structure


CAS No.:7439-89-6
EINECS(EC#): 231-096-4
Molecular Weight:55.845
grey crystalline powder, rod or chips
Melting Point
Boiling Point
Flash Point
>230 °F
Silvery-white or gray, soft, ductile, malleable metal ... In powder form it is black to gray
Cubic crystal system. Body-centered cubic structure
Silver-white or gray metal
Pure iron is a silvery white, relatively soft metal
Stable. Reacts slowly with moist air and water. Dust may form an explosive or combustible mixture with air. Incompatible with organic acids, strong oxidizing agents, water, mineral acids.
HS Code
Storage temp
Keep from contact with oxidizing materials. Store in a cool, dry, well-ventilated area away from incompatible substances.
Safety and Handling
Hazard Codes
Risk Statements
Safety Statements
Hazard Note

Poison by intraperitoneal route. Questionable carcinogen with experimental tumorigenic data. Human systemic effects: irritability, nausea or vomiting, normocytic anemia. Iron is potentially toxic in all forms and by all routes of exposure. The inhalation of large amounts of iron dust results in iron pneumoconiosis (arc welder's lung). Chronic exposure to excess levels of iron (>50–100 mg Fe/day) can result in pathological deposition of iron in the body tissues, the symptoms of which are fibrosis of the pancreas, diabetes mellitus, and liver cirrhosis.
  As with other metals, it becomes more reactive as it is more finely divided. Ultrafine iron powder is pyrophoric and potentially explosive. Explosive or violent reaction with ammonium nitrate + heat, ammonium peroxodisulfate, chloric acid, chlorine trifluoride, chloroformamidinium nitrate, bromine pentafluoride + heat (with iron powder), air + oil (with iron dust), sodium acetylide. Ignites on contact with chlorine, dinitrogen tetraoxide, liquid fluorine, hydrogen peroxide (with iron powder), nitryl fluoride + heat, peroxyformic acid, potassium perchlorate, potassium dichromate, sodium peroxide (at 240°), polystyrene + friction or spark (iron powder). Mixtures of iron dust with air + water may ignite on drying. Reduced iron reacts with water to produce explosive hydrogen gas. Catalyzes the exothermic polymerization of acetaldehyde.
Hazard Codes: FlammableF,IrritantXi
Risk Statements: 36/38-11-17
R36/38:Irritating to eyes and skin. 
R11:Highly flammable. 
R17:Spontaneously flammable in air.
Safety Statements: 26-16-33 
S16:Keep away from sources of ignition. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S33:Take precautionary measures against static discharges.
RIDADR: UN 3264 8/PG 3
WGK Germany: 1 
RTECS: NO4565500


Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
child TDLo oral 77mg/kg (77mg/kg) BEHAVIORAL: IRRITABILITY


Journal of Toxicology, Clinical Toxicology. Vol. 25, Pg. 251, 1987.
guinea pig LD50 oral 20gm/kg (20000mg/kg)   Indian Journal of Pharmacy. Vol. 13, Pg. 240, 1951.
rabbit LDLo intraperitoneal 20mg/kg (20mg/kg)   National Technical Information Service. Vol. PB158-508,
rat LD50 oral 30gm/kg (30000mg/kg)   Indian Journal of Pharmacy. Vol. 13, Pg. 240, 1951.

Skin, Eye, and Respiratory Irritations
If inhaled, iron is a local irritant to the lung and gastrointestinal tract.
UN 1383/3089
Fire Fighting Procedures
Special mixtures of dry chemical.
Iron flake powder and polystyrene beads had been blended in a high-speed mixer. The mixture ignited and burned rapidly when discharged into a polythene bag. Rapid oxidation of the finely divided metal and/or static discharge may have initiated the fire. No ignition occurred when the iron powder was surface coated with stearic acid.
Fire Potential
Moderate, in form of dust when exposed to heat or flame.
The minimum ignition temperatures for iron dust clouds range from 470-780 deg C; for layered dust, the range is 220-520 deg C.
Good wrought iron contains no more than 0.035% carbon, but also contains 0.075-0.15% silicon, 0.1-0.25% phosphorus,
Cast iron contains 2-4% carbon and varying amounts of silicon, phosphorus, sulfur, and manganese, to obtain a wide range of physical and chemical properties. Alloying elements such as silicon, nickel, chromium, molybdenum, copper, and titanium may be added in amounts varying from a few tenths to 30% or more.
Steel is a generic name for a large group of /iron-carbon/ alloys in which the carbon content is about 2%. To this basic steel, other alloying elements may be added, the more common types of which are aluminum, chromium, cobalt, /chromium-nickel/, /chromium-aluminum/, manganese, nickel, silicon, and tungsten, each of which has particular uses arising from its special properties.
Reactivities and Incompatibilities
Iron and hydrogen peroxide ignite immediately if a trace of manganese dioxide is present.
Powdered iron reacts with fluorine below redness with incandescence.
Chlorine trifluoride reacts with iron with incandescence.
In a study of the spontaneous exothermic reaction of iron powder or turnings with water in absence of chlorides, rust was found to catalyse the reaction.
Ultrafine iron powder is pyrophoric.
Explosive or violent reaction with ammonium nitrate and heat, ammonium peroxodisulfate, chloric acid, chlorine trifluoride, ... bromine pentafluoride, sodium acetylide.
Reduced iron reacts with water to produce explosive hydrogen gas.
Mixtures of iron dust with air and water may ignite on drying.
Hot iron (wire) burns in chlorine gas.
Other Preventative Measures
SRP: Local exhaust ventilation should be applied wherever there is an incidence of point source emissions or dispersion of regulated contaminants in the work area. Ventilation control of the contaminant as close to its point of generation is both the most economical and safest method to minimize personnel exposure to airborne contaminants.
SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.
All ... /iron/ preparations should be kept in child-proof bottles. /Iron preparations/
Protective Equipment and Clothing
If inhaled, iron is a local irritant to the lung and gastrointestinal tract.

  Iron (CAS NO.7439-89-6), its Synonyms are Diseases (animal), iron overload ; Diseases, iron overload ; Ferrous iron ; Ferrovac E ; Ferrum ; Iron, elemental ; LOHA ; Ancor en 80/150 ; Armco iron ; Atomel 28 ; Atomel 300M200 . It is grey crystalline powder, rod or chips.


Reported in EPA TSCA Inventory.

Disposal Methods
SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

2.Hazard identification

2.1 Classification of the substance or mixture

Not classified.

2.2 GHS label elements, including precautionary statements

Pictogram(s) No symbol.
Signal word

No signal word.

Hazard statement(s)


Precautionary statement(s)








2.3 Other hazards which do not result in classification


Precursor and Product
Computational chemical data
  • Molecular Weight:55.845g/mol
  • Molecular Formula:Fe
  • Exact Mass:55.934942
  • Monoisotopic Mass:55.934942
  • Complexity:0
  • Rotatable Bond Count:0
  • Hydrogen Bond Donor Count:0
  • Hydrogen Bond Acceptor Count:0
  • Topological Polar Surface Area:0
  • Heavy Atom Count:1
  • Defined Atom Stereocenter Count:0
  • Undefined Atom Stereocenter Count:0
  • Defined Bond Stereocenter Count:0
  • Undefined Bond Stereocenter Count:0
  • Isotope Atom Count:0
  • Covalently-Bonded Unit Count:1
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