294993 Sigma-Aldrich


Green Alternative

anhydrous, ≥99.98%

  • CAS Number 7664-41-7

  • Linear Formula NH3

  • Molecular Weight 17.03

  •  Beilstein/REAXYS Number 3587154

  •  EC Number 231-635-3

  •  MDL number MFCD00011418

  •  PubChem Substance ID 24857750

  •  NACRES NA.22



Related Categories Alternative Energy, Amides, Chemical Synthesis, Enabling Products, Greener Alternative Products,
Quality Level   200
grade   anhydrous
vapor density   0.6 (vs air)
vapor pressure   8.75 atm ( 21 °C)
assay   ≥99.98%
form   liquefied gas
autoignition temp.   1203 °F
expl. lim.   25 %
greener alternative product characteristics   Design for Energy Efficiency
Learn more about the Principles of Green Chemistry.
pH   ~10-12 (20 °C, 50 g/L)
pKa (25 °C)   9.25
bp   −33 °C (lit.)
mp   −78 °C (lit.)
solubility   water: 531 g/L at 20 °C
density   0.7 g/cm3 at -33 °C
SMILES string   N
InChI   1S/H3N/h1H3


General description

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product has been enhanced for energy efficiency. Find details here.


Ammonia may be used as a base to adjust pH for preparing mixed magnetite-hematite nanoparticles via combustion method. These nanoparticles show promising potential as sorbents for removing heavy metal ions from water.

Anhydrous ammonia has been used in dynamic reaction cell technology (DRC) to remove interfering ions without the loss of sensitivity. It has also been used for adjusting pH during the synthesis of magnetite-hematite mixture by combustion methods.

Reagent for chemical vapor deposition of TiN.


170 g in steel cylinder

Other Notes

For 294993-230G-EU packaging: 500 mL of aluminium cylinder equipped with stainless steel valve.

Recommended products

• For 294993-170G: Use either Z148504 or Z148512 CGA 180 Regulators, OR Z146943 CGA 110 Valve, with Z147095 CGA 110 to CGA 180 adapter and Z146986 washer.
• For 294993-230G-EU: outlet fitting: DIN 477-1 no. 1, Z742162 or Z742164 are the recommended regulators.

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
Supplemental Hazard Statements 
UN 1005 2.3(8)
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


III-V Material Sources

At the forefront of optoelectronic, lighting and data storage applications, III-V semiconductor materials continue to generate exciting new applications. III-V quantum dot heterostructures can addres...
Chemfiles Volume 4 Article 3
Keywords: Applications, Automotive, Electronics, Inductively coupled plasma, Mass spectrometry, Semiconductor

Molecular Layer Deposition of Organic and Hybrid Organic-Inorganic Polymers

Atomic layer deposition (ALD) techniques have emerged in the last ten years to meet various needs including semiconductor device miniaturization, conformal deposition on porous structures and coating...
Steven M. George, Byunghoon Yoon
Material Matters 2008, 3.2, 34.
Keywords: Atomic layer deposition, Biochemistry, Chemical reactions, Condensations, Deposition, Ligands, Polymerization reactions, Semiconductor, Tissue microarrays

TLC Analysis of Phosphates on TLC pre-coated plate Cellulose

From our library of Articles, Sigma-Aldrich presents TLC Analysis of Phosphates on TLC pre-coated plate Cellulose
Keywords: Thin layer chromatography

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99112 Outlet valve No 70688, stainless steel, pkg of 1 ea

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