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Osmium tetraoxide, 100 mg

≥99,95 %, p.a., for electron microscopy
Icon_EVE-EUD Please consider that this product might be liable to some legal sanctions as for example to obtain an end user declaration or the prohibition of some applications. For details please do contact your counterpart in our sales department!
Examples of effect: Damage metals and burn body tissues; may cause serious eye damage. Safety: Avoid contact; wear safety spectacles and gloves. In the event of contact with eyes and skin, rinse with water.
Examples of effect: In smaller quantities, lead to immediate serious damage to health or death. Safety: Do not inhale, touch or swallow. Wear work safety equipment. Call a poison control centre or doctor immediately. Recovery position.
i fatal if swallowed, in contact with skin or if inhaled, causes severe skin burns and eye damage
P280 P301+P330+P331 P302+P352 P304+P340 P305+P351+P338 P309+P311
i wear protective gloves/protective clothing/eye protection/face protection, IF SWALLOWED: rinse mouth. Do NOT induce vomiting, IF ON SKIN: Wash with plenty of soap and water, IF INHALED: Remove person to fresh air and keep comfortable for breathing, IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing, IF exposed or if you feel unwell: Call a POISON CENTER or doctor/physician
Pack Qty.
Osmium(VIII) oxide, Osmic acid
Empirical formula OsO4
Molar mass (M) 254,20 g/mol
Density (D) 4,9 g/cm³
Boiling point (bp) 130 °C
Melting point (mp) 40 °C
Storage temp. +4 to +15 °C
ADR 6.1 I
CAS No. 20816-12-0
EG-Nr. 244-058-7
UN-Nr. 2471

In sealed off glass ampoules.

Osmium tetraoxide is suitable for fixing lipides and proteins. Because of the low penetration power, application is primarily limited to ultra thin techniques with small tissue samples.
Product details

€69.80/Pack Qty. 

excl. VAT. | 100 mg per Pack Qty.

Art. No. 8371.1

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Product details

Osmium tetraoxide is suitable for fixing lipides and proteins. Because of the low penetration power, application is primarily limited to ultra thin techniques with small tissue samples.

Osmium tetraoxide ≥99,95 %, p.a., for electron microscopy

Osmium tetraoxide
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Art. No. Pack Qty. Pack. Price Quantity
8371.1 100 mg glass


8371.2 500 mg glass


8371.3 1 g glass


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Downloads / MSDS

General information

Salts for Analysis

Our salts for analysis are manufactured under strict production guidelines. Analytical purity and best quality reliably characterize each batch. Salts in p.a. quality made by Carl ROTH meet the high requirements for reproducible results. Most of our salts are additionally specified according to international standards like ACS and ISO.

p.a.: pro analysi (for analysis)ACS: American Chemical SocietyISO: International Standard Organisation


Oxidising Agents

Oxidation reactions play an important role - not only in inorganic chemistry but also in many organic synthesis processes. Several examples are shown here: Lemieux-von-Rudloff oxidation, Lemieux-Johnson oxidation and dihydroxylation. Carl ROTH offers a selection of well-known and commonly available oxidants in this area.

Certificates of Analysis

You can search for and download your certificate of analysis for the selected product here. Please provide your batch number.
The following analysis certificates have been found:

Guarantee analysis

Appearancepale yellow crystals
Assay≥99.95 %
Osmium (Os)74-76 %
Aluminium (Al)≤0.001 %
Calcium (Ca)≤0.001 %
Lead (Pb)≤0.001 %
Sodium (Na)≤0.001 %
Nickel (Ni)≤0.001 %
Non volatile matter≤0.02 %