Osmium Ring

CAS 7440-04-2
Linear Formula: Os
MDL Number: MFCD00011147
EC No.: 231-114-0

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(2N) 99% Osmium Rings
OS-M-02-RNG Pricing
(3N) 99.9% Osmium Rings
OS-M-03-RNG Pricing
(4N) 99.99% Osmium Rings
OS-M-04-RNG Pricing
(5N) 99.999% Osmium Rings
OS-M-05-RNG Pricing


Molecular Weight 190.23
Appearance Yellow Crystalline Solid
Melting Point 3045 °C
Boiling Point 5027 °C
Density 22.57 g/cm3
Thermal Expansion

(25 °C) 5.1 µm·m-1·K-1

Poisson Ratio 0.25
Vickers Hardness 3920 MPa
Young's Modulus N/A
Tensile Strength N/A
Thermal Conductivity N/A
Electronegativity 2.2 Paulings
Specific Heat 0.03127 Cal/g/K @ 25 °C
Heat of Vaporization 162 K-Cal/gm atom at 5027 °C
Heat of Fusion 7.0 Cal/gm mole

Health & Safety Information

Signal Word Danger
Hazard Statements H228-H315-H318-H335
Hazard Codes F,Xi
Risk Codes 11-37/38-41
Safety Statements 16-26-36/37/39
RTECS Number RN1100000
Transport Information UN 3089 4.1/PG 2
WGK Germany nwg

View and Print SDS


Date Accessed: 07/27/2016
Date Revised: 05/15/2015


Product Name: Osmium Ring

Product Number: All applicable American Elements product codes, e.g. OS-M-02-RNG, OS-M-03-RNG, OS-M-04-RNG, OS-M-05-RNG

CAS #: 7440-04-2

Relevant identified uses of the substance: Scientific research and development

Supplier details:
American Elements
1093 Broxton Ave. Suite 2000
Los Angeles, CA 90024
Tel: +1 310-208-0551
Fax: +1 310-208-0351

Emergency telephone number:
Domestic, North America +1 800-424-9300
International +1 703-527-3887


Classification of the substance or mixture
Classification according to Directive 67/548/EEC or Directive 1999/45/EC
Information concerning particular hazards for human and environment: Not applicable
Label elements
Labelling according to EU guidelines:
Code letter and hazard designation of product:
Risk phrases:
Hazard description:
WHMIS classification
Classification system
HMIS ratings (scale 0-4)
(Hazardous Materials Identification System)
Health (acute effects) = 0
Flammability = 0
Reactivity = 0
Other hazards
Results of PBT and vPvB assessment
PBT: Not applicable.
vPvB: Not applicable.


Chemical characterization: Substances
CAS# Description:
7440-04-2 Osmium
Identification number(s):
EC number: 231-114-0


Description of first aid measures
After inhalation
Supply fresh air. If required, provide artificial respiration. Keep patient warm.
Seek immediate medical advice.
After skin contact
Immediately wash with water and soap and rinse thoroughly.
Seek immediate medical advice.
After eye contact
Rinse opened eye for several minutes under running water. Then consult a doctor.
After swallowing Seek medical treatment.
Information for doctor
Most important symptoms and effects, both acute and delayed
No further relevant information available.
Indication of any immediate medical attention and special treatment needed
No further relevant information available.


Extinguishing media
Suitable extinguishing agents Special powder for metal fires. Do not use water.
For safety reasons unsuitable extinguishing agents Water
Special hazards arising from the substance or mixture
In case of fire, the following can be released:
Toxic metal oxide fume
Advice for firefighters
Protective equipment:
Wear self-contained respirator.
Wear fully protective impervious suit.


Personal precautions, protective equipment and emergency procedures
Wear protective equipment. Keep unprotected persons away.
Ensure adequate ventilation
Keep away from ignition sources
Environmental precautions:
Do not allow material to be released to the environment without proper governmental permits.
Methods and material for containment and cleaning up:
Ensure adequate ventilation.
Keep away from ignition sources.
Reference to other sections
See Section 7 for information on safe handling
See Section 8 for information on personal protection equipment.
See Section 13 for disposal information.


Precautions for safe handling
Handle under dry protective gas.
Keep container tightly sealed.
Store in cool, dry place in tightly closed containers.
Ensure good ventilation at the workplace.
Information about protection against explosions and fires:
Protect against electrostatic charges.
Conditions for safe storage, including any incompatibilities
Requirements to be met by storerooms and receptacles: Store in a cool location.
Information about storage in one common storage facility:
Store away from oxidizing agents.
Store away from halogens.
Do not store with interhalogens.
Store away from phosphorus.
Store away from air.
Further information about storage conditions:
Store under dry inert gas.
Keep container tightly sealed.
Store in cool, dry conditions in well sealed containers.
This product is air sensitive.
Specific end use(s) No further relevant information available.


Additional information about design of technical systems:
Properly operating chemical fume hood designed for hazardous chemicals and having an average
face velocity of at least 100 feet per minute.
Control parameters
Components with limit values that require monitoring at the workplace:
Additional information: No data
Exposure controls
Personal protective equipment
General protective and hygienic measures
The usual precautionary measures for handling chemicals should be followed.
Keep away from foodstuffs, beverages and feed.
Remove all soiled and contaminated clothing immediately.
Wash hands before breaks and at the end of work.
Maintain an ergonomically appropriate working environment.
Breathing equipment: Use suitable respirator when high concentrations are present.
Protection of hands:
Impervious gloves
Check protective gloves prior to each use for their proper condition.
Material of gloves
The selection of suitable gloves not only depends on the material, but also on quality.
Quality will vary from manufacturer to manufacturer.
Eye protection: Safety glasses
Body protection: Protective work clothing.


Information on basic physical and chemical properties
General Information
Form: Disc/Target
Color: grey
pH-value: Not applicable.
Change in condition
Melting point/Melting range: 3045°C (5513 °F)
Boiling point/Boiling range: 5027°C (9081 °F)
Sublimation temperature / start: Not determined
Flammability (solid, gaseous) Highly flammable.
Ignition temperature: Not determined
Decomposition temperature: Not determined
Auto igniting: Not determined.
Explosion limits:
Lower: Not determined
Upper: Not determined
Vapor pressure at 2450°C (4442 °F): 0.0013 hPa
Density at 20°C (68 °F): 22.61 g/cm³ (188.68 lbs/gal)
Relative density Not determined.
Vapour density Not applicable.
Evaporation rate Not applicable.
Solubility in / Miscibility with
Water: Insoluble
Segregation coefficient (n-octonol/water): Not determined.
dynamic: Not applicable.
kinematic: Not applicable.
Other information No further relevant information available.


Chemical stability
Thermal decomposition / conditions to be avoided:
Decomposition will not occur if used and stored according to specifications.
Possibility of hazardous reactions
Osmium powder forms toxic osmium tetroxide when exposed to air.
Incompatible materials:
Oxidizing agents
Hazardous decomposition products: Toxic metal oxide fume


Information on toxicological effects
Acute toxicity:
Primary irritant effect:
on the skin: May cause irritation
on the eye: May cause irritation
Sensitization: No sensitizing effects known.
Additional toxicological information:
To the best of our knowledge the acute and chronic toxicity of this substance is not fully known.
No classification data on carcinogenic properties of this material is available from the EPA, IARC, NTP, OSHA or ACGIH.
The Registry of Toxic Effects of Chemical Substances (RTECS) contains acute and/or other multiple dose toxicity data for components in this product.


Aquatic toxicity: No further relevant information available.
Persistence and degradability No further relevant information available.
Behavior in environmental systems:
Bioaccumulative potential No further relevant information available.
Mobility in soil No further relevant information available.
Additional ecological information:
General notes:
Do not allow material to be released to the environment without proper governmental permits.
Results of PBT and vPvB assessment
PBT: Not applicable.
vPvB: Not applicable.
Other adverse effects No further relevant information available.


Waste treatment methods
Recommendation Consult state, local or national regulations to ensure proper disposal.
Uncleaned packagings:
Recommendation: Disposal must be made according to official regulations.


DOT, ADR, ADN, IMDG, IATA Not applicable
UN proper shipping name
DOT, ADR, ADN, IMDG, IATA Not applicable
Transport hazard class(es)
Class Not applicable
Packing group
DOT, ADR, IMDG, IATA Not applicable
Environmental hazards:
Marine pollutant: Yes (PP)
Special precautions for user Not applicable.
Transport in bulk according to Annex II of
MARPOL73/78 and the IBC Code Not applicable.


Safety, health and environmental regulations/legislation specific for the substance or mixture
Product related hazard informations:
Hazard symbols:
F Highly flammable
Risk phrases:
11 Highly flammable.
National regulations
All components of this product are listed in the U.S. Environmental Protection Agency Toxic Substances Control Act Chemical substance Inventory.
All components of this product are listed on the Canadian Domestic Substances List (DSL).
Information about limitation of use: For use only by technically qualified individuals.
Other regulations, limitations and prohibitive regulations
REACH - Pre-registered substances Substance is listed.
Chemical safety assessment: A Chemical Safety Assessment has not been carried out.


Safety Data Sheet according to Regulation (EC) No. 1907/2006 (REACH). The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. American Elements shall not be held liable for any damage resulting from handling or from contact with the above product. See reverse side of invoice or packing slip for additional terms and conditions of sale. COPYRIGHT 1997-2016 AMERICAN ELEMENTS. LICENSED GRANTED TO MAKE UNLIMITED PAPER COPIES FOR INTERNAL USE ONLY.


Osmium RingOsmium Rings can be customized in width, thickness, and ring diameter. Osmium rings may have a custom shape hole and may be open or closed. American Elements specializes in producing high purity uniform shaped Osmium rings. American Elements offers custom rings with annealed or hard tempers and will meet most of the common Milspec or ASTM standards. Osmium rings are hollow, circular pieces of metal and can be produced in custom sizes. In addition to standard alloys, American Elements also specializes in corrosion resistant alloys, high temperature applications, and custom shapes and forms including custom inside and outside dimensions and threading. American Elements also produces Osmium as rod, ingot, powder, pieces, disc, granules, wire, and in compound forms, such as oxide. Osmium rings can be used as components in several applications.



Chemical Identifiers

Linear Formula Os
CAS 7440-04-2
Pubchem CID 23937
MDL Number MFCD00011147
EC No. 231-114-0
Beilstein Registry No. N/A
InchI Identifier InChI=1S/Os

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Products & Element Information

See more Osmium products. Osmium (atomic symbol: Os, atomic number: 76) is a Block D, Group 8, Period 6 element with an atomic weight of 190.23. Osmium Bohr ModelThe number of electrons in each of osmium's shells is [2, 8, 18, 32, 14, 2] and its electron configuration is [Xe] 4f14 5d6 6s2. The osmium atom has a radius of 135 pm and a Van der Waals radius of 216 pm. Osmium was discovered and first isolated by Smithson Tennant in 1803. Elemental OsmiumIn its elemental form, osmium has a silvery blue cast apperance. Osmium has the highest melting point and the lowest vapor pressure of any of the platinum group of metals it is also the densest naturally ocurring element. Osmium is the least abundant stable element in the earth's crust. It is found in the alloys osmiridium and iridiosmium and as a free element. The origin of the name Osmium comes from the Greek word osme, meaning a smell or odor.

Recent Research

Luminescent osmium(ii) bi-1,2,3-triazol-4-yl complexes: photophysical characterisation and application in light-emitting electrochemical cells., Ross, Daniel A. W., Scattergood Paul A., Babaei Azin, Pertegás Antonio, Bolink Henk J., and Elliott Paul I. P. , Dalton Trans, 2016 May 4, Volume 45, Issue 18, p.7748-57, (2016)

An Entry to Stable Mixed Phosphine-Osmium-NHC Polyhydrides., Buil, María L., Cardo Juan J. F., Esteruelas Miguel A., Fernández Israel, and Oñate Enrique , Inorg Chem, 2016 May 16, Volume 55, Issue 10, p.5062-70, (2016)

Aerobic Oxidation of an Osmium(III) N-Hydroxyguanidine Complex To Give Nitric Oxide., Xiang, Jing, Wang Qian, Yiu Shek-Man, Man Wai-Lun, Kwong Hoi-Ki, and Lau Tai-Chu , Inorg Chem, 2016 May 16, Volume 55, Issue 10, p.5056-61, (2016)

Distribution of coniferin in differentiating normal and compression woods using MALDI mass spectrometric imaging coupled with osmium tetroxide vapor treatment., Yoshinaga, Arata, Kamitakahara Hiroshi, and Takabe Keiji , Tree Physiol, 2016 May, Volume 36, Issue 5, p.643-52, (2016)

Enhanced multiplexing in mass cytometry using osmium and ruthenium tetroxide species., Catena, Raúl, Özcan Alaz, Zivanovic Nevena, and Bodenmiller Bernd , Cytometry A, 2016 Mar 28, (2016)

Oxidative Cyclization of 1,5-Dienes with Hydrogen Peroxide Catalyzed by an Osmium(III) Complex: Synthesis of cis-Tetrahydrofurans., Sugimoto, Hideki, Kanetake Takayuki, Maeda Kazuki, and Itoh Shinobu , Org Lett, 2016 Mar 18, Volume 18, Issue 6, p.1246-9, (2016)

Estimating the Compressibility of Osmium from Recent Measurements of Ir-Os Alloys under High Pressure., Sarlis, Nicholas V., and Skordas Efthimios S. , J Phys Chem A, 2016 Mar 10, Volume 120, Issue 9, p.1601-4, (2016)

Biological properties of novel ruthenium- and osmium-nitrosyl complexes with azole heterocycles., Novak, Maria S., Büchel Gabriel E., Keppler Bernhard K., and Jakupec Michael A. , J Biol Inorg Chem, 2016 Jun, Volume 21, Issue 3, p.347-56, (2016)

Unexpected higher stabilisation of two classical antiaromatic frameworks with a ruthenium fragment compared to the osmium counterpart: origin probed by DFT calculations., Wu, Jingjing, Hao Yulei, An Ke, and Zhu Jun , Chem Commun (Camb), 2016 Jan 7, Volume 52, Issue 2, p.272-5, (2016)

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