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Oxygen scavengers and boiler chemicals

Hydroxylamine

Also known as Oxammonium, azinous acid, Hydroxyamine

CAS 7803-49-8Formula H3NOMolar mass 33.03 g/molEC 232-259-2
GHS signal word: Danger. Pictograms: Explosive, Corrosive, Harmful or irritant, Serious health hazard 39 suppliers listed
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Hydroxylamine chemical structure, H3NO, CAS 7803-49-8
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless cyrstals
Melting point
33 °C
Boiling point
107 °C
Density
1.2 g/cm³
Flash point
129 °C
HS code
282510
Category
Oxygen scavengers and boiler chemicals
UN number
UN 2735
Illustrative photo, white flakes in a glass jar on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Hydroxylamine?

Plain description, key identifiers and synonyms

Hydroxylamine is the simplest hydroxylamine, consisting of ammonia bearing a hydroxy substituent. It is an intermediate in the biological nitrification by microbes like bacteria. It has a role as a nitric oxide donor, a nucleophilic reagent, an EC 1.1.3.13 (alcohol oxidase) inhibitor, an EC 4.2.1.22 (cystathionine beta-synthase) inhibitor, a bacterial xenobiotic metabolite, an EC 4.3.1.10 (serine-sulfate ammonia-lyase) inhibitor and an algal metabolite. It is a conjugate acid of a hydroxyazanide and an aminooxidanide. It derives from a hydride of an ammonia.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
hydroxylamine
CAS number
7803-49-8 CAS number cross-checkedOther or deprecated CAS: 11104-93-1, 11129-69-4, 13408-29-2, 9001-84-7
EC number
232-259-2
Molecular formula
H3NO
UNII
2FP81O2L9Z
MDL number
MFCD00044522
InChIKey
AVXURJPOCDRRFD-UHFFFAOYSA-N
InChI
InChI=1S/H3NO/c1-2/h2H,1H2
SMILES (canonical and isomeric)
NO

Synonyms

  • Oxammonium
  • azinous acid
  • Hydroxyamine
  • Oxyammonia
  • dihydridohydroxidonitrogen
  • Hydroxylamine, 50 wt. % solution in water
  • Hydroxylamine Solution (50 wt. % in H2O)
  • arninoalcohol
  • hyroxylamine
  • Hydroxylamin
  • amino alcohol
  • amino-alcohol
  • hydroxy amine
  • hydroxyl amine
  • hydroxyl-amine
  • N-hydroxyamine
  • amine N-oxide
  • Phospholipase A2
  • (1) hydroxylamine
  • HONH2
  • sPLA2 (Type III)
  • [NH2OH]
  • N H2 O H
  • Hydroxylamine, 50wt.% in H2O
  • Sdccgsbi-0050617.p002
Show all 28 synonyms
  • Hydroxylamine Solution(50 wt. % in H2O)
  • 2Ffdcfe4-66e9-4869-8f4d-dc8e410797e7
  • Hydroxylamine hydrochloride in combination with isoniazid and rifampicin

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless cyrstalsexp.
Melting point
33 °Cexp.
Boiling point
107 °Cexp.
Density
1.2 g/cm³exp.
Flash point
129 °Cexp.
Autoignition temperature
215 °Cexp.
Solubility
Very sol in water, liq ammonia, methanol, sparingly sol in ether, benzene, carbon disulfide, chloroformexp.
Vapour pressure
53 mm Hg at 32 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
33.03 g/molcalc.
Exact mass
33.0215 Dacalc.
LogP (octanol/water)
-0.67calc.
Topological polar surface area
46.25 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
2calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS01: Explosive
Explosive
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment
023NFPA 704 rating

Hazard statements

  • H200Unstable explosive.
  • H290May be corrosive to metals.
  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H315Causes skin irritation.
  • H317May cause an allergic skin reaction.
  • H318Causes serious eye damage.
  • H335May cause respiratory irritation.
  • H351Suspected of causing cancer.
  • H373May cause damage to organs through prolonged or repeated exposure.
  • H400Very toxic to aquatic life.
Precautionary statements (36)
  • P201Obtain special instructions before use.
  • P202Do not handle until all safety precautions have been read and understood.
  • P203Obtain, read and follow all safety instructions before use.
  • P234Keep only in original packaging.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P281Use personal protective equipment as required.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P372Explosion risk.
  • P373Do not fight fire when fire reaches explosives.
  • P380Evacuate area.
  • P390Absorb spillage to prevent material damage.
  • P391Collect spillage.
  • P401Store in accordance with local regulations.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P406Store in a corrosion resistant container with a resistant inner liner.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2735
Transport hazard class
8
Packing group
III

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Hydroxylamine suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 39 suppliers
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Where suppliers are based

39 suppliers in 11 countries

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Hydroxylamine price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

As reducing agent in photography, in synthetic and analytical chemistry, to purify aldehydes and ketones, as antioxidant for fatty acids and soaps, as dehairing agent for hides.

Over 95% of hydroxylamine produced is used for the production of cyclohexanone oxime or caprolactam.

Chemical intermediate for miscellaneous organic & inorganic chemicals (in lab), reducing agent, chemical intermediate (captively) for caprolactam used in nylon 6, absorbent for removing nitrogen dioxide, termination agent in peroxide-catalyzed polymerizations, agent in developers for photographic silver emulsions.

Industrial uses: Reducing agent.

Industries and functions

Roles

  • Lewis base
  • algal metabolite
  • bacterial metabolite
  • bacterial xenobiotic metabolite
  • base
  • donor
  • enzyme inhibitor
  • eukaryotic metabolite
  • metabolite
  • nitric oxide donor
  • nucleophilic reagent
  • prokaryotic metabolite
  • reagent
  • xenobiotic metabolite

Functional uses

  • Dispersing agent

How it is made

Hurd, Inorg Syn 1: 87 (1939), Benson et al, J Am Chem Soc 78: 4202 (1956).

Semon, Org Syn 3: 61 (1923), Benson et al, J Am Chem Soc 78: 4202 (1956) (Hydroxylamine hydrochloride)

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 612-122-00-7

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Hydroxylamine, Ref no: 1505, Annex ref: II/1505

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Hydroxylamine is traded under.

HS 2825.10Exact HS code

Hydrazine and hydroxylamine and their inorganic salts

World exports in 2024
$228M
−5.9% vs 2023, imports $212M
2019 to 2024
Top exporters
  1. Germany51.1%
  2. China12.9%
  3. France * partner reported8.2%
Top importers
  1. India * partner reported18.8%
  2. United States17.1%
  3. Belgium7.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Hydroxylamine is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Hydroxylamine, based on the data on this page

What is Hydroxylamine?

Hydroxylamine is the simplest hydroxylamine, consisting of ammonia bearing a hydroxy substituent. It is an intermediate in the biological nitrification by microbes like bacteria.

What is the CAS number of Hydroxylamine?

The CAS registry number of Hydroxylamine is 7803-49-8. Other or deprecated CAS numbers: 11104-93-1, 11129-69-4, 13408-29-2.

What is the molecular formula and weight of Hydroxylamine?

The molecular formula of Hydroxylamine is H3NO and its molar mass is 33.03 g/mol.

What is Hydroxylamine used for?

As reducing agent in photography, in synthetic and analytical chemistry, to purify aldehydes and ketones, as antioxidant for fatty acids and soaps, as dehairing agent for hides. Over 95% of hydroxylamine produced is used for the production of cyclohexanone oxime or caprolactam.

Is Hydroxylamine hazardous?

Hydroxylamine carries the GHS signal word "Danger". Main hazards: unstable explosive, may be corrosive to metals, harmful if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Hydroxylamine?

Hydroxylamine is usually classified under HS code 282510 (Hydrazine and hydroxylamine and their inorganic salts). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Hydroxylamine?

CompoundList lists 39 suppliers of Hydroxylamine in China, United States, India, Germany and 7 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Hydroxylamine in India?

3 suppliers in India list Hydroxylamine on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Hydroxylamine?

Suppliers quote Hydroxylamine on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Hydroxylamine

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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