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Methylamine

Athanor · official

CH5N · 31.057 g/mol

IUPAC name: methanamine

Also called aminomethane, monomethylamine

Open in Athanor
The structure of Methylamine
Drawn from its SMILES with RDKit430
FlammableCompressed gasCorrosiveHarmful or irritantDangerExtremely flammable gas · Causes skin irritation · Causes serious eye damage · Harmful if inhaled · May cause respiratory irritation

Names and identifiers

IUPAC name
methanamine
Synonyms
aminomethane, monomethylamine, Methanamine
+ 36 more

Aminomethane, Monomethylamine, Carbinamine, Mercurialin, N-Methylamine, Methylaminen, Metilamine, Metyloamina, Anhydrous Methylamine, BSF23SJ79E, AI3-15637-X, Methylamine, anhydrous, DTXSID7025683, CHEBI:16830, monomethylammonium ion, Methylamine (aqueous), Methylamine (anhydrous), methylamine bisulfite, RefChem:42734, DTXCID305683, 200-820-0, Methylamine aq, Methylamine-d5, Methylamine-N,N-d2, methyl-amine, MeNH2, CH3NH2, MFCD00008104, monomethyl amine, NME, Methylamine (33% in EtOH), Methylamine (2.0M in THF), Methylaminen [Dutch], Metilamine [Italian], Metyloamina [Polish], methylamin

Molecular formula
CH5N
Empirical formula
CH5N
Molecular weight
31.057 g/mol
Exact mass
31.04220
CAS number
74-89-5
PubChem CID
6329
Canonical SMILES
CN
Isomeric SMILES
CN
InChI
InChI=1S/CH5N/c1-2/h2H2,1H3
InChIKey
BAVYZALUXZFZLV-UHFFFAOYSA-N
Molfile

Names, InChI and the identifiers from PubChem, retrieved 2026-10-14.

Physical properties

TemperaturePressureDensity
Appearance
Colorless gas [Note: A liquid below 21 degrees F. Shipped as a liquefied compressed gas][6]
8 values

From Hazardous Substances Data Bank (HSDB), the most authoritative source here.

ValueAs writtenSource
–Methylamine, anhydrous appears as a colorless gas or a liquid. Pungent fishy odor resembling odor of ammonia. The liquid boils at cold temperatures, hence it vaporizes rapidly when unconfined. Vapors are heavier than air and may collect in low-lying areas. Easily ignited under most conditions. Under prolonged exposure to intense heat the containers may rupture violently and rocket. Used for making pharmaceuticals, insecticides, paint removers, surfactants, rubber chemicals.[1] CAMEO Chemicals
–Methylamine, aqueous solution appears as a colorless to yellow aqueous solution of a gas. Odor ranges from fishlike to ammonia-like as the vapor concentration increases. Flash point (of 30% solution) 34 °F. Corrosive to skin and eyes. Less dense than water; vapors heavier than air. Produces toxic oxides of nitrogen during combustion.[1] CAMEO Chemicals
–Gas Vapor; Liquid; Liquid[2] EPA Chemical Data Reporting (CDR)
–COLOURLESS COMPRESSED LIQUEFIED GAS WITH CHARACTERISTIC ODOUR.[3] ILO-WHO International Chemical Safety Cards (ICSCs)
–COLOURLESS SOLUTION IN WATER WITH PUNGENT ODOUR.[3] ILO-WHO International Chemical Safety Cards (ICSCs)
–Colorless gas with a fish- or ammonia-like odor.[4] Occupational Safety and Health Administration (OSHA)
–Colorless gas with a fish- or ammonia-like odor. [Note: A liquid below 21 °F. Shipped as a liquefied compressed gas.][5] The National Institute for Occupational Safety and Health (NIOSH)
–shownColorless gas [Note: A liquid below 21 degrees F. Shipped as a liquefied compressed gas][6] Hazardous Substances Data Bank (HSDB)cites NIOSH. NIOSH Pocket Guide to Chemical Hazards. Department of Health & Human Services, Centers for Disease Control & Prevention. National Institute for Occupational Safety & Health. DHHS (NIOSH) Publication No. 2010-168 (2010). Available from: https://www.cdc.gov/niosh/npg
Odor
Fish or ammonia-like odor[6]
Melting point
-92.5 °C (-134.5 °F, USCG 1999)[1]
7 values

5 of 5 sources agree on it (most common value).

ValueAs writtenSource
−92.5 °Cshown-134.5 °F (USCG, 1999)[1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office.
−92.5 °C-134.5 °F (USCG, 1999)[1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office.
−93 °C-93 °C[3] ILO-WHO International Chemical Safety Cards (ICSCs)
−39 °C-39 °C[3] ILO-WHO International Chemical Safety Cards (ICSCs)
−93 °C-136 °F[4] Occupational Safety and Health Administration (OSHA)
−93.5 °C-93.5 °C[7] PAC Chemical Database, U.S. Department of Energy
−93 °C-136 °F[5] The National Institute for Occupational Safety and Health (NIOSH)
Boiling point
-6.30 °C (20.66 °F) at 760 mmHg (USCG, 1999)[1]
7 values

5 of 5 sources agree on it (most common value).

ValueAs writtenSource
−6.5 °C20.3 °F at 760 mmHg (USCG, 1999)[1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office.
−6.3 °Cshown20.66 °F at 760 mmHg (USCG, 1999)[1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office.
−6 °C-6 °C[3] ILO-WHO International Chemical Safety Cards (ICSCs)
48 °C48 °C[3] ILO-WHO International Chemical Safety Cards (ICSCs)
−6.5 °C20.3 °F[4] Occupational Safety and Health Administration (OSHA)
−6.3 °C-6.32 °C @760 [mm Hg][7] PAC Chemical Database, U.S. Department of Energy
−6 °C21 °F[5] The National Institute for Occupational Safety and Health (NIOSH)
Density
0.6624 g/cu cm at 25 °C[6]
9 values

Only one source reports it.

ValueAs writtenSource
–0.693 at 20.3 °F (USCG, 1999) - Less dense than water[1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office.
0.6624 g/mLshown0.6624 g/cu cm at 25 °C[6] Hazardous Substances Data Bank (HSDB)cites Gerhartz, W. (exec ed.). Ullmann's Encyclopedia of Industrial Chemistry. 5th ed.Vol A1: Deerfield Beach, FL: VCH Publishers, 1985 to Present., p. VA16: 536 (1990)
0.0014 g/mL0.0014 g/cu cm at 101.33 kPa[6] Hazardous Substances Data Bank (HSDB)cites Gerhartz, W. (exec ed.). Ullmann's Encyclopedia of Industrial Chemistry. 5th ed.Vol A1: Deerfield Beach, FL: VCH Publishers, 1985 to Present., p. VA16: 536 (1990)
–Relative density (water = 1): 0.7 (liquid)[3] ILO-WHO International Chemical Safety Cards (ICSCs)
–Relative density (water = 1): 0.89[3] ILO-WHO International Chemical Safety Cards (ICSCs)
–0.693 at 20.3 °F[4] Occupational Safety and Health Administration (OSHA)
–0.656 @25 °C[7] PAC Chemical Database, U.S. Department of Energy
–0.70 (Liquid at 13 °F)[5] The National Institute for Occupational Safety and Health (NIOSH)
–1.08(relative gas density)[5] The National Institute for Occupational Safety and Health (NIOSH)

4 more values were reported but failed the checks (unreadable or out of range), so they are not shown.

Solubility in water
Solubility in water at 25 °C: very good[3]
3 values

From ILO-WHO International Chemical Safety Cards (ICSCs), the most authoritative source here.

ValueAs writtenSource
–greater than or equal to 100 mg/mL at 70 °F (NTP, 1992)[1] CAMEO Chemicalscites National Toxicology Program, Institute of Environmental Health Sciences, National Institutes of Health (NTP). 1992. National Toxicology Program Chemical Repository Database. Research Triangle Park, North Carolina.
–shownSolubility in water at 25 °C: very good[3] ILO-WHO International Chemical Safety Cards (ICSCs)
–Soluble[5] The National Institute for Occupational Safety and Health (NIOSH)
log P
-0.71[3]
3 values

Sources disagree; from ILO-WHO International Chemical Safety Cards (ICSCs), the most authoritative.

ValueAs writtenSource
–log Kow = -0.57[6] Hazardous Substances Data Bank (HSDB)cites Hansch, C., Leo, A., D. Hoekman. Exploring QSAR - Hydrophobic, Electronic, and Steric Constants. Washington, DC: American Chemical Society., 1995., p. 3
–shown-0.71[3] ILO-WHO International Chemical Safety Cards (ICSCs)
–-0.6[3] ILO-WHO International Chemical Safety Cards (ICSCs)
pKa
pKa = 10.68[6]
3 values

Only one source reports it.

ValueAs writtenSource
–pKb = 3.32[6] Hazardous Substances Data Bank (HSDB)cites Clayton, G. D. and F. E. Clayton (eds.). Patty's Industrial Hygiene and Toxicology: Volume 2A, 2B, 2C: Toxicology. 3rd ed. New York: John Wiley Sons, 1981-1982., p. 3137
–shownpKa = 10.68[6] Hazardous Substances Data Bank (HSDB)cites Clayton, G. D. and F. E. Clayton (eds.). Patty's Industrial Hygiene and Toxicology: Volume 2A, 2B, 2C: Toxicology. 3rd ed. New York: John Wiley Sons, 1981-1982., p. 3137
–pKa = 10.62 at 25 °C[6] Hazardous Substances Data Bank (HSDB)cites Dean, J.A. Handbook of Organic Chemistry. New York, NY: McGraw-Hill Book Co., 1987., p. 8-38
Vapor pressure
1972.92 mmHg at 16 °C (60 °F, USCG 1999)[1]
5 values

Sources disagree; from CAMEO Chemicals, the most authoritative.

ValueAs writtenSource
1972.92 mmHgshown1972.92 mmHg at 60 °F (USCG, 1999)[1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office.
2650 mmHg2.65X10+3 mm Hg at 25 °C[6] Hazardous Substances Data Bank (HSDB)cites Daubert, T.E., R.P. Danner. Physical and Thermodynamic Properties of Pure Chemicals Data Compilation. Washington, D.C.: Taylor and Francis, 1989.
2300 mmHgVapor pressure, kPa at 20 °C: 304[3] ILO-WHO International Chemical Safety Cards (ICSCs)
230 mmHgVapor pressure, kPa at 20 °C: 31[3] ILO-WHO International Chemical Safety Cards (ICSCs)
750 mmHg750 [mm Hg] @-6.6 °C[7] PAC Chemical Database, U.S. Department of Energy

2 more values were reported but failed the checks (unreadable or out of range), so they are not shown.

Flash point
-10 °C[3]
5 values

3 of 3 sources agree on it (most common value).

ValueAs writtenSource
−10 °C14 °F (Liquid) (NIOSH, 2024)[1] CAMEO Chemicals
0 °C32 °F (USCG, 1999)[1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office.
−10 °C-10 °C (14 °F) - closed cup /Methylamine solution 30-50%/[6] Hazardous Substances Data Bank (HSDB)cites Sigma-Aldrich; Safety Data Sheet for Methylamine solution, Product Number: 426466, Version 3.13 (Revision Date 09/06/2018). Available from, as of January 18, 2019: https://www.sigmaaldrich.com/safety-center.html
0 °C32 °F (closed cup)[6] Hazardous Substances Data Bank (HSDB)cites Lewis, R.J. Sr. (ed) Sax's Dangerous Properties of Industrial Materials. 11th Edition. Wiley-Interscience, Wiley & Sons, Inc. Hoboken, NJ. 2004., p. 2377
−10 °Cshown-10 °C[3] ILO-WHO International Chemical Safety Cards (ICSCs)

1 more value was reported but failed the checks (unreadable or out of range), so it is not shown.

Autoignition temperature
430 °C[3]
5 values

3 of 3 sources agree on it (most common value).

ValueAs writtenSource
430 °C806 °F (USCG, 1999)[1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office.
430 °C806 °F (USCG, 1999)[1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office.
430 °C806 °F (430 °C)[6] Hazardous Substances Data Bank (HSDB)cites National Fire Protection Association; Fire Protection Guide to Hazardous Materials. 14TH Edition, Quincy, MA 2010, p. 325-81
430 °Cshown430 °C[3] ILO-WHO International Chemical Safety Cards (ICSCs)
430 °C430 °C[3] ILO-WHO International Chemical Safety Cards (ICSCs)

Each value as its source reports it, with the source's number after it (listed under References). Where several sources report a property, the row shows the value most of them agree on, the rule the app uses; open the values to see every one.

Calculated

Heavy atoms
2
Rings
0
Aromatic rings
0
Fraction sp³ carbons (Fsp3)
1
H-bond donors
1
H-bond acceptors
1
Rotatable bonds
0
TPSA (Ų)
26
Formal charge
0
XLogP3
-0.7 PubChem
Complexity
2 PubChem
Stereocenters
None
Double-bond geometry
None specified
Point group
Cs of one 3D conformer with its hydrogens, by Athanor’s engine (as in the app)

Elemental analysis

  • C38.67%
  • H16.23%
  • N45.10%

Isotope pattern

100%31.0421.5%32.044

Each peak is a nominal mass with its abundance-weighted exact mass, as a percentage of the tallest, from IUPAC natural isotope abundances.

Computed from the structure with RDKit 2026.09 when this page was built, beside PubChem's own computed values from its record; where the two differ, both are shown.

Predicted

log P
-0.43 Crippen (Wildman and Crippen 1999)
log S (water solubility)
0.24 ESOL (Delaney 2004), log mol/L
Synthetic accessibility
3 SA score, 1 easy to 10 hard (Ertl and Schuffenhauer 2009)

Drug-likeness: Lipinski’s rule of five

  • Molecular weight ≤ 500: 31.06
  • log P ≤ 5 (Crippen): -0.43
  • H-bond donors ≤ 5: 1
  • H-bond acceptors ≤ 10: 1

Passes all four rules.

¹³C NMR shifts, predicted

Predictions, not measurements; each names its method. A measured log P, where a source reports one, is under Physical properties.

Safety

Danger

Harmonized EU classification (CLP Annex VI). Source [8].

  • Flammable
  • Compressed gas
  • Corrosive
  • Harmful or irritant
430
NFPA 704[6]
  • H220Extremely flammable gas
  • H315Causes skin irritation
  • H318Causes serious eye damage
  • H332Harmful if inhaled
  • H335May cause respiratory irritation

Precautionary statements: P203, P210, P222, P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P354+P338, P317, P319, P321, P332+P317, P362+P364, P377, P381, P403, P403+P233, P405, P501

View all classifications (5)
  • [8] Regulation (EC) No 1272/2008 of the European Parliament and of the Council · DangerH220, H315, H318, H332, H335
  • [8] Regulation (EC) No 1272/2008 of the European Parliament and of the Council · DangerH224, H302, H314, H332
  • [9] European Chemicals Agency (ECHA) · 2,107 reports · DangerH220, H224, H225, H280, H302, H314, H315, H318, H319, H332, H335
  • [9] European Chemicals Agency (ECHA) · 38 reports · DangerH220, H280, H315, H318, H332, H335
  • [6] Hazardous Substances Data Bank (HSDB) · DangerH225, H302, H314, H318, H331, H335

Exposure limits

  • PEL-TWA (8-Hour Time Weighted Average): 10 ppm (12 mg/m³)[4]
  • PEL: TWA 10 ppm (12 mg/m3)[5]
  • TLV: 5 ppm as TWA; 15 ppm as STEL.[3]
  • TLV-TWA (Time Weighted Average): 5 ppm [2012][4]
  • TLV-STEL (Short Term Exposure Limit): 15 ppm [2012][4]
  • IDLH: 100 ppm (NIOSH, 2024)[1]

First aid

  • Eyes: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. Immediately transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop. Skin: Immediately flood affected skin with water while removing and isolating all contaminated clothing.[1]
  • Inhalation: Remove victim to fresh air at once. If breathing is difficult, give oxygen. If breathing has stopped, give artificial respiration. Get medical attention. Eyes: Flush with water for at least 15 minutes. Physician should examine eyes if irritation or pain persists after 15 minutes. Skin: Exposed area should be washed twice with soap and water. Physician should examine exposed area if pain or irritation persist after area is washed. Ingestion: Do not induce vomiting or perform gastric lavage. Do not attempt to neutralize. Dilute with water or milk in copious amounts. (USCG, 1999)[1]
  • General First Aid: · Call 911 or emergency medical service. · Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination. · Move victim to fresh air if it can be done safely. · Administer oxygen if breathing is difficult. · If victim is not breathing: -- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance. -- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped…[10]
  • General First Aid: · Call 911 or emergency medical service. · Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination. · Move victim to fresh air if it can be done safely. · Administer oxygen if breathing is difficult. · If victim is not breathing: -- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance. -- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped…[10]

Storage

  • Fireproof. Cool.[3]
  • Fireproof. Cool. Well closed. Separated from food and feedstuffs, strong acids, oxidants, aluminium, copper, zinc, zinc alloys and mercury. Keep in a well-ventilated room.[3]
  • Keep container tightly closed in a dry and well-ventilated place. Containers which are opened must be carefully resealed and kept upright to prevent leakage. Storage class (TRGS 510): 3: Flammable liquids (methylamine solution 30-50%)[6]
  • They are extremely flammable products that should be stored in a well-ventilated area and protected from fire risk. (methylamines)[6]

Incompatibilities

  • Incompatible materials: Acids, acid chlorides, acid anhydrides, oxidizing agents, chloroformates, phosphorus halides (methylamine solution 30-50%)[6]
  • A medium strong base. Reacts violently with strong acids, mercury, strong oxidizers, nitromethane. Corrosive to copper, zinc alloys, aluminum, and galvanized surfaces.[6]
  • Forms an explosive mixture with nitromethane.[6]
  • May react with acids, oxidizing materials, chlorine, hypochlorite, halogenated compounds, reactive organic compounds and some metals, and mercury and nitrosating compounds.[6]

Always read the supplier’s safety data sheet before working with it.

Spectra

Experimental spectra held by these sources; each link opens the source's own record.

Literature

Reading PubChem, OpenAlex and GSRS…

Bioactivity

Reading ChEMBL…

References

  1. [1]CAMEO Chemicals · Public domain (NOAA) · via PubChem · retrieved 2026-10-14
  2. [2]EPA Chemical Data Reporting (CDR) · Public domain (US EPA) · via PubChem · retrieved 2026-10-14
  3. [3]ILO-WHO International Chemical Safety Cards (ICSCs) · CC BY 4.0 · via PubChem · retrieved 2026-10-14
  4. [4]Occupational Safety and Health Administration (OSHA) · Public domain (US DOL) · via PubChem · retrieved 2026-10-14
  5. [5]The National Institute for Occupational Safety and Health (NIOSH) · Public domain (US CDC) · via PubChem · retrieved 2026-10-14
  6. [6]Hazardous Substances Data Bank (HSDB) · Public domain (US NLM) · via PubChem · retrieved 2026-10-14
  7. [7]PAC Chemical Database, U.S. Department of Energy · Public domain (US DOE) · via PubChem · retrieved 2026-10-14
  8. [8]Regulation (EC) No 1272/2008 of the European Parliament and of the Council · EU reuse policy, CC BY 4.0 · via PubChem · retrieved 2026-10-14
  9. [9]European Chemicals Agency (ECHA) · ECHA legal notice: reuse with acknowledgement · via PubChem · retrieved 2026-10-14
  10. [10]Emergency Response Guidebook (ERG) · Public domain (US DOT) · via PubChem · retrieved 2026-10-14
  11. [11]NMRShiftDB · Linked only · via PubChem · retrieved 2026-10-14
  12. [12]Human Metabolome Database (HMDB) · Linked only · via PubChem · retrieved 2026-10-14
  13. [13]SpectraBase · Linked only · via PubChem · retrieved 2026-10-14
  14. [14]NIST Mass Spectrometry Data Center · Linked only · via PubChem · retrieved 2026-10-14
  15. [15]MassBank of North America (MoNA) · CC BY 4.0 · via PubChem · retrieved 2026-10-14
  16. ·Calculated values: computed by Athanor with RDKit 2026.09 from the structure.
  17. ·Literature on PubChem

Data last updated 2026-10-14.