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SPI-Chem Aqueous Osmium Tetroxide, EM Grade
SPI-Chem Aqueous Osmium Tetroxide, EM Grade
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SPI-Chem Aqueous Osmium Tetroxide, EM Grade

Packs of 10

Size Options for SPI-Chem Aqueous Osmium Tetroxide, EM Grade
Size 2%, 2ml ampoule
Item Number 02595-BA
Availability In Stock
Quantity Price/EA
1 to 9 $47.76
10 and up $42.98
Size 2%, 5ml ampoule
Item Number 02597-BA
Availability In Stock
Price  $83.64
Size 4%, 2ml ampoule
Item Number 02598-BA
Availability In Stock
Price  $53.04
Size 4%, 5ml ampoule
Item Number 02599-BA
Availability In Stock
Quantity Price/EA
1 to 9 $130.56
10 and up $117.50
Size 4%,10ml ampoule
Item Number 02600-BA
Availability In Stock
Quantity Price/EA
1 to 9 $205.80
10 and up $185.22
Chemical Formula:OsO4
Formula Weight:254.21
RTECS #:RN1140000
Apperance:Not available
Color:Not available
Odor:Not available
Boiling Point:129.7° C / 265.46° F
Melting Point:Not available
Specific Gravity (H2O = 1):Not available
Vapor Pressure at 25°C:9.8 mm Hg
Solubilities:5.07% at 25°C, 6.5% at 90°C, unknown amounts in xylene, chloroform and heptane
Osmium Purity:99.99%

Shipping Information

UN #:2471
Proper Shipping Name:Osmium tetroxide
Hazard Class:6.1
Packing Group:I

Osmium tetroxide is a cornerstone fixative for transmission electron microscopy (TEM) and must be absolutely pure! The SPI-Chem™ brand of osmium tetroxide is EM grade and is available either as pure 99.995% crystals or, for convenience, as aqueous solutions. Both forms of the product are sealed under dry nitrogen in easy-to use, pre-scored safe, snap open ampoules for a one-time application and use. Osmium metal in many ways is unique among the elements and is even "heavier" than iridium, making it the heaviest of all the elements of the Periodic Table.

Osmium tetroxide is very hazardous and dangerous and strict safety procedures should be followed at all times. Toxicological information suggests that osmium tetroxide vapor is extremely hazardous and very low limits should be set for human exposure. As part of your "sharps" injury loss prevention program, always open ampoules with an SPI Supplies brand glass ampoule breaker. 

Osmium tetroxide, as great as it is for electron microscopy, is not the only electron dense stain that can be used, so be sure to check out other possibilities. And while you are checking out other stains, think about what embedding resins or tweezers or grids you might be needing soon.

Much has been published in the literature about the osmium staining of different materials for TEM and even SEM, but the newest area has been for microwave assisted staining.