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Nitrogen oxide (N2O4)

Also known as: Dinitrogen tetroxide · NITROGEN TETROXIDE · Dinitrogen tetraoxide · 10544-72-6

CAS No.: 10544-72-6
Formula: N2O4
Molar mass: 92.011 g/mol
PubChem CID: 25352

GHS pictograms

Oxidizing

Compressed gas

Corrosive

Toxic

Harmful / Irritant

Health hazard

2D structure of Nitrogen oxide (N2O4) — 2D structure · PubChem CID 25352

New to Safety Data Sheets? What is an SDS · SDS vs MSDS · The 16 sections explained · Read an SDS in 5 min · Compatibility chart

Summary

Nitrogen oxide (N2O4) (N2O4), CAS 10544-72-6. Common in labs and industry. Read on for hazards, storage, PPE and mixing rules.

Background

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Physical properties

Boiling point°C

21.2

70.1 °F at 760 mmHg (USCG, 1999)

Melting point°C

-11.2

11.8 °F (USCG, 1999)

Autoignition temperature°C

—

Densityg/mL

—

Vapor pressuremmHg

1551

1551 mmHg (USCG, 1999)

Water solubility

—

Sourced from PubChem Experimental Properties. Values may vary between sources and conditions.

Hazards

Oxidizing (GHS03)

May cause or intensify fire.

Compressed gas (GHS04)

Contents under pressure, may explode if heated.

Corrosive (GHS05)

Attacks skin, eyes and materials.

Toxic (GHS06)

May be fatal even in small doses.

Harmful / Irritant (GHS07)

May cause skin, eye or respiratory irritation.

Health hazard (GHS08)

Serious long-term health effects (CMR, respiratory sensitizer).

Hazard statements

Storage

Temperature

Keep at room temperature, below 30 °C, out of direct heat.

Ventilation

Store somewhere well-ventilated and away from any ignition source.

Containers

Metal drums or tinted glass, tightly sealed.

Keep away from

Strong acids, strong bases and powerful oxidizers.

Personal protective equipment

Gloves

Nitrile or butyl, at least 0.4 mm thick.

Eye protection

Safety goggles with side shields.

Respirator

A2 organic-vapor cartridge if the room isn't well ventilated.

Occupational exposure limits (HSE)

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EU harmonised classification (ECHA C&L)

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Transport

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FDA recalls & enforcement

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Compatibilities

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Practical safety notes

Oxidizing. Keep away from combustibles, organics, reducers and fuels.
Compressed gas. Secure cylinders upright, protect valves, store in ventilated areas.
Corrosive. Wear chemical goggles, faceshield and chemical-resistant gloves. Have an eyewash within reach.
Acute toxicity. Work under a fume hood, restrict access, keep a specific antidote plan available.
Irritant / harmful. Ventilate the workspace and avoid skin contact.
Serious health hazard (carcinogen, mutagen, reprotoxic, respiratory sensitizer). Substitute if possible; otherwise closed systems and medical surveillance.

Derived from the GHS classification shown above. These notes are generic guidance and do not replace the manufacturer's SDS or your local risk assessment.

FAQ

Is Nitrogen oxide (N2O4) flammable?+

Nitrogen oxide (N2O4) (CAS 10544-72-6) does not carry the GHS02 flame pictogram in our records. Always confirm with the manufacturer's SDS section 9 (flash point) before assuming a product is non-flammable.

What PPE should I wear when handling Nitrogen oxide (N2O4)?+

Chemical-splash goggles and a faceshield, chemical-resistant gloves (nitrile or butyl) and an apron are the minimum. Work inside a fume hood or use a suitable respirator. Check SDS section 8 for material-specific breakthrough times.

How should Nitrogen oxide (N2O4) be stored?+

Store Nitrogen oxide (N2O4) (CAS 10544-72-6) in tightly closed original containers, in a cool, dry, well-ventilated area away from incompatible materials. Segregate acids from bases and keep away from metals that can be attacked.

Is Nitrogen oxide (N2O4) dangerous for the environment?+

No specific environmental pictogram (GHS09) is listed in our records for Nitrogen oxide (N2O4), but any chemical waste should be handled through your site's hazardous-waste procedure, not poured down the drain.

Where can I find the official Safety Data Sheet for Nitrogen oxide (N2O4)?+

Official, up-to-date SDS documents are published by each manufacturer (Sigma-Aldrich, Merck, Thermo Fisher, VWR, Carl Roth, etc.) and by regulators such as ECHA and NIOSH. This page is an educational summary and does not replace the manufacturer's SDS.

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