Osmic acid, 99.9%

Name: Osmic acid, 99.9%
Brand: Vaqora Chemicals
SKU: VQ-015398

About Osmic acid, 99.9%

Vaqora Chemicals supplies Osmic acid, a precious metal compound registered under CAS number 20816-12-0 at a purity of 99.9%. With the molecular formula O4Os, it has a molar mass of 254.2 g/mol. The IUPAC name is tetraoxoosmium. Common synonyms include Osmium tetroxide and Osmium(VIII)-oxide.

The material typically appears as yellow to pale yellow solid or crystals. Literature values give a melting point of 40-44 °C. Keep the container tightly sealed and store it in a cool, dry area. It carries the GHS signal word “Danger” with 4 hazard statements. Review the Safety Data Sheet before use.

Typical applications include biological staining and oxidation reactions. It is used across academic and industrial research.

Standard pack sizes are 1 g, 10 x 1 g and 100 x 1 g, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Biological staining
Oxidation reactions

Industries

Specifications & identifiers

Chemical identifiers
Product name	Osmic acid, 99.9%
Catalogue No.	VQ-015398
CAS Number	20816-12-0
IUPAC name	tetraoxoosmium
Molecular formula	O₄Os
Molecular weight	254.2 g/mol
Exact mass	255.9411
Purity / assay	99.9%
HSN code	28439019
InChIKey	VUVGYHUDAICLFK-UHFFFAOYSA-N
SMILES	O=[Os](=O)(=O)=O
PubChem CID	30318

Physical properties
Physical form	Crystalline
Appearance	Yellow to pale yellow solid or crystals
Melting point	40-44 °C
H-bond donors / acceptors	0 / 4
TPSA	68.3 Å²
UN number	UN 2471
Synonyms	Osmium tetroxide, Osmium(VIII)-oxide, Osmium tetraoxide, Perosmic oxide, Osmium(VIII) oxide, Osmic acid anhydride, Perosmic acid anhydride, Osmium oxide (OsO4), (T-4)-, Acid, Osmic, Tetroxide, Osmium, OsO4, Osmium oxide, (T-4)-

Safety & hazard information (GHS)

Corrosive

Toxic

Signal word: Danger

Hazard statements

H300Fatal if swallowed
H310Fatal in contact with skin
H314Causes severe skin burns and eye damage
H330Fatal if inhaled

Precautionary statements: P260, P262, P264, P270, P271, P280, P284, P301 + P316, P301 + P330 + P331, P302 + P352, P302 + P361 + P354, P304 + P340, P305 + P354 + P338, P316, P320, P321, P330, P361 + P364, P363, P403 + P233, P405, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Other grades of CAS 20816-12-0

AR

Osmic acid, AR ≥99.9%

CAS: 20816-12-0
Formula: O₄Os
MW: 254.2 g/mol

VQ-045689

Osmic acid, solution, 2% w/v

CAS: 20816-12-0
Formula: O₄Os
MW: 254.2 g/mol

VQ-015399

Frequently asked questions

What is the CAS number of Osmic acid, 99.9%?

The CAS Registry Number of Osmic acid, 99.9% is 20816-12-0. It is also known as Osmium tetroxide, Osmium(VIII)-oxide, Osmium tetraoxide.

What is the molecular formula and molecular weight of Osmic acid, 99.9%?

Osmic acid, 99.9% has the molecular formula O4Os and a molecular weight of 254.2 g/mol. Its IUPAC name is tetraoxoosmium.

Which grade and pack sizes of Osmic acid, 99.9% can I order?

We supply Osmic acid, 99.9% in (99.9%) grade, in 1 g, 10 x 1 g, 100 x 1 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Osmic acid, 99.9%?

Yes. Every lot of Osmic acid, 99.9% is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Osmic acid, 99.9% be shipped internationally?

Yes. Osmic acid, 99.9% is classified as hazardous (UN 2471), so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.