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Name Manganese dioxide
CAS 1313-13-9
EINECS(EC#) 215-202-6
Molecular Formula MnO2
MDL Number MFCD00003463
Molecular Weight 86.94
MOL File 1313-13-9.mol

Chemical Properties

Appearance Iron-black to dark steel-gray or bluish mineral; black or bluish-black streak; metallic or dull luster. Sol- uble in hydrochloric acid.
Melting point  535 °C (dec.) (lit.)
density  5.02
vapor pressure  0-0Pa at 25℃
storage temp.  Store below +30°C.
solubility  <0.001g/l insoluble
form  powder
color  gray
Specific Gravity 5.026
Stability: Stable. Incompatible with strong acids, strong reducing agents, organic materials.
Water Solubility  insoluble
Merck  14,5730
Reactivity Profile The stability of manganese dioxide is due primarily to its insolubility. It is, however, readily attacked by reducing agents in acid solution, for example oxidizing concentrated hydrochloric acid to chlorine. In hot concentrated alkali it dissolves to give a purple solution which contains an equimolar mixture of trivalent manganese, probably as (Mn(OH)6)3- and manganate(V), (MnO4)3-. Manganese dioxide is also one of the most active catalysts for the oxidation of carbon monoxide near room temperature.
Exposure limits ACGIH: TWA 0.02 mg/m3; TWA 0.1 mg/m3
OSHA: Ceiling 5 mg/m3
NIOSH: IDLH 500 mg/m3; TWA 1 mg/m3; STEL 3 mg/m3
The chemistry of manganese(III) is not extensive, and in the higher oxidation states manganese dioxide and potassium permanganate are the most important compounds.
Manganese dioxide is also used in the manufacture of glass to bleach the colour of any iron present. If excess manganese dioxide is added, a pink coloration can be produced in the glass and if a large excess is present it will appear black.
Other uses of manganese dioxide include its use as an oxidizing agent in organic chemistry and as an oxidizing agent in safety matches, fireworks and flares. It is also an effective adsorbent for hydrogen sulphide and is also used to colour ceramics.
CAS DataBase Reference 1313-13-9(CAS DataBase Reference)
NIST Chemistry Reference manganese(IV) dioxide(1313-13-9)
EPA Substance Registry System 1313-13-9(EPA Substance)

Safety Data

Hazard Codes  Xn
Risk Statements 
R20/22:Harmful by inhalation and if swallowed .
Safety Statements 
S25:Avoid contact with eyes .
RIDADR  3137
WGK Germany  1
RTECS  OP0350000
PackingGroup  III
HS Code  28201000
Safety Profile
Poison by intravenous and intratracheal routes. Moderately toxic by subcutaneous route. Experimental reproductive effects. A powerful oxidizer. Flammable by chemical reaction. It must not be heated or rubbed in contact with easily oxilzable matter. Violent thermite reaction when heated with aluminum. Potentially explosive reaction with hydrogen peroxide, peroxomonosulfuric acid, chlorates + heat, anilinium perchlorate. Ignition on contact with hydrogen sulfide. Violent reaction with oxidizers, potassium azide (when warmed), diboron tetrafluoride, Incandescent reaction with calcium hydride, chlorine trifluoride, rubidium acetylide (at 350℃). Vigorous reaction with hydroxylaminium chloride. Incompatible with H202, H2SO j, Naz02. Keep away from heat and flammable materials. See also MANGANESE COMPOUNDS.
LD50 orally in rats: >40 mmole/kg (Holbrook)

Hazard Information

Material Safety Data Sheet(MSDS)

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