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ammonia

Also known as: ammonia · azane · 7664-41-7 · Ammonia gas

CAS No.: 7664-41-7
Formula: H3N
Molar mass: 17.031 g/mol
PubChem CID: 222

GHS pictograms

Flammable

Compressed gas

Corrosive

Toxic

Harmful / Irritant

Health hazard

Environmental hazard

2D structure of ammonia — 2D structure · PubChem CID 222

Summary

ammonia (H3N), CAS 7664-41-7. Common in labs and industry. Read on for hazards, storage, PPE and mixing rules.

Background

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Hazards

Flammable (GHS02)

Ignites easily when exposed to a flame or spark.

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).

Environmental hazard (GHS09)

Toxic to aquatic organisms.

Hazard statements

H221: Flammable gas [Danger Flammable gases]
H314: Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]
H331: Toxic if inhaled [Danger Acute toxicity, inhalation]
H400: Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]
H280: Contains gas under pressure
H332: Harmful if inhaled [Warning Acute toxicity, inhalation]
H335
H411
H402: Harmful to aquatic life [Hazardous to the aquatic environment, acute hazard]
H220: Extremely flammable gas [Danger Flammable gases]
H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]
H334: May cause allergy or asthma symptoms or breathing difficulties if inhaled [Danger Sensitization, respiratory]
H370: Causes damage to organs [Danger Specific target organ toxicity, single exposure]
H372: Causes damage to organs through prolonged or repeated exposure [Danger Specific target organ toxicity, repeated exposure]

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

Flammable. Keep away from open flames, hot surfaces and sparks. Ground containers when transferring.
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.
Environmental hazard. Do not release to sewers or waterways; collect for hazardous waste disposal.

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 ammonia flammable?+

Yes. ammonia (CAS 7664-41-7) carries the GHS02 flame pictogram. Keep it away from ignition sources, use non-sparking tools, and ground metal containers when transferring liquid.

What PPE should I wear when handling ammonia?+

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 ammonia be stored?+

Store ammonia (CAS 7664-41-7) in tightly closed original containers, in a cool, dry, well-ventilated area away from incompatible materials. Use a flammable-liquid cabinet and keep away from oxidizers and heat. Segregate acids from bases and keep away from metals that can be attacked.

Is ammonia dangerous for the environment?+

Yes. ammonia carries the GHS09 environment pictogram. Do not release to drains, soil or waterways; collect residues for hazardous-waste disposal in line with local regulations.

Where can I find the official Safety Data Sheet for ammonia?+

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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