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SPI-Chem Osmium Tetroxide, Sealed Glass Ampoules, Crystalline
SPI-Chem Osmium Tetroxide, Sealed Glass Ampoules, Crystalline
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SPI-Chem Osmium Tetroxide, Sealed Glass Ampoules, Crystalline

Size Options for SPI-Chem Osmium Tetroxide, Sealed Glass Ampoules, Crystalline
Size 0.1 g
Item Number 02604-AB
Availability In Stock
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1 to 9 $10.00
10 to 29 $9.00
30 and up $8.50
Size 0.25 g
Item Number 02590-AB
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1 to 9 $12.33
10 to 29 $11.10
30 and up $10.48
Size 0.5 g
Item Number 02602-AB
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1 to 9 $23.50
10 to 29 $21.15
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Size 1.0 g
Item Number 02601-AB
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1 to 9 $35.00
10 to 29 $31.50
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Chemical Formula:OsO4
CAS#:20816-12-0
Formula Weight:254.21
RTECS #:RN1140000
Apperance:Crystalline (non-descript and amporphous looking mass)
Color:Pale yellow
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
FSC:6810
Osmium Purity:99.99%

Shipping Information

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

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.