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structure of 7440-04-2

Osmium Powder, -200 Mesh (Metals Basis)(CAS 7440-04-2)

CAS No.: 7440-04-2 Brand: MolBest
M. Ft.: Os Cat. No: G1105389
M. Wt.: 190.23 MDL: MFCD00011147
Storage: Store under inert gas. Use: For laboratory research use only
UN No.: UN 3089 4.1 /PG II
Purity Grade Package Stock Price Quantity
99.95%
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Extra Pure 250MG In Stock 18 USD
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Extra Pure 1G In Stock 44 USD
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Extra Pure 5G In Stock 213 USD
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Extra Pure 25G In Stock 1617 USD
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Applications of 7440-04-2

  • Staining Agent: Osmium tetroxide is extensively used in electron microscopy for tissue staining.
  • Organic Synthesis: It serves as a catalyst in organic reactions, particularly for dihydroxylation of alkenes.
  • Alloys: Osmium is used as an alloying agent to improve hardness and durability in materials like fountain pen tips and electrical contacts.
  • Research: Its unique properties make it valuable in scientific research, particularly in studies involving oxidation reactions.

Physical and chemical properties of 7440-04-2

Appearance of Characters

sponge

Boiling Point

5012 °C

Decomposition

When heated to decomposition it emits toxic fumes of /osmium tetraoxide/.

Density

22.59 g/cu cm

Exact Mass

191.961502

Exposure Limits

ACGIH: Ceiling 2 ppm
OSHA: Ceiling 5 ppm(7 mg/m3)
NIOSH: IDLH 50 ppm; Ceiling 5 ppm(7 mg/m3)

Melting Point

Osmium has the highest specific gravity and melting point of the platinum group metals; metallurgically unworkable

Merck

13,6960

Molecular Formula

Os

Molecular Weight

190.230

Stability

Stable in air in the cold; when finely divided, is slowly oxidized by air even at ordinary temperature to form tetroxide.

Vapour Pressure

1.8 Pa (mm Hg) at 3050 °C

Water Solubility

attacked by aqua regia; barely affected by HCl, H2SO4 [MER06]

Q&A for CAS 7440-04-2

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Download SDS of 7440-04-2

Pictograms

Signal Word

Danger

Hazard Statements

H228 Flammable solid
H315 Causes skin irritation
H318 Causes serious eye damage
H335 May cause respiratory irritation
H413 May cause long lasting harmful effects to aquatic life

Safety Data Sheet

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Operate under the ISO 9001 system