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124-40-3

Name Dimethylamine
CAS 124-40-3
EINECS(EC#) 204-697-4
Molecular Formula C2H7N
MDL Number MFCD00008288
Molecular Weight 45.08
MOL File 124-40-3.mol

Chemical Properties

Description
Dimethylamine is a colourless flammable gas at room temperature. It has a pungent, fishy, or ammonia-like odour at room temperature and is shipped and marketed in compressed liquid form. It is very soluble in water and soluble in alcohol and ether. It is incompatible with oxidising materials, acrylaldehyde, fluorine, maleic anhydride, chlorine, or mercury. Dimethylamine is a precursor to several industrially important compounds. For instance, it used in the manufacture of several products, for example, for the vulcanisation process of rubber, as detergent soaps, in leather tanning, in the manufacture of pharmaceuticals, and also for cellulose acetate rayon treatment.
Appearance colourless gas with strong ammonia-like smell
Melting point  −93 °C(lit.)
Boiling point  7 °C(lit.)
density  0.89 g/mL at 25 °C
vapor density  1.55 (vs air)
vapor pressure  16.97 psi ( 55 °C)
refractive index  n20/D 1.37
Fp  60 °F
storage temp.  Flammables area
solubility  very soluble in water (163 g/100 g water at 40°C); soluble in ethanol, ethyl ether, and many organic solvents
form  Solution
pka 10.68(at 25℃)
color  Clear slightly yellow
Odor Ammonical odour
Stability: Stable. Generally used as a solution in water at concentrations up to around 40%. Extremely flammable in the pure form. Incompatible with strong oxidizing agents.
explosive limit 14.4%
Odor Threshold 0.033ppm
Water Solubility  Miscible with water and most organic solvents.
Sensitive  Hygroscopic
Merck  14,3228
BRN  605257
Henry's Law Constant 1.75(x 10-5 atm?m3/mol) at 25 °C (Christie and Crisp, 1967)
Dielectric constant 6.3(0℃)
Exposure limits TLV-TWA 10 ppm (~18 mg/m3) (ACGIH, MSHA, and OSHA); IDLH 2000 ppm (NIOSH).
LogP -0.274 at 25℃
CAS DataBase Reference 124-40-3(CAS DataBase Reference)
NIST Chemistry Reference Methanamine, N-methyl-(124-40-3)
EPA Substance Registry System 124-40-3(EPA Substance)

Safety Data

Hazard Codes  F+,Xn,C,F,T
Risk Statements 
R12:Extremely Flammable.
R20:Harmful by inhalation.
R37/38:Irritating to respiratory system and skin .
R41:Risk of serious damage to eyes.
R34:Causes burns.
R20/22:Harmful by inhalation and if swallowed .
R11:Highly Flammable.
R39/23/24/25:Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed .
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed .
Safety Statements 
S3:Keep in a cool place .
S16:Keep away from sources of ignition-No smoking .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S29:Do not empty into drains .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S39:Wear eye/face protection .
RIDADR  UN 2924 3/PG 2
WGK Germany  2
RTECS  IP8750000
3
Autoignition Temperature 753 °F
TSCA  Yes
DOT Classification 2.1 (Flammable gas)
HazardClass  3
PackingGroup  II
HS Code  29211100
storage Dimethylamine should be stored in a cool, dry, well-ventilated area in tightly sealed containers that are labeled in accordance with OSHA’s Hazard Communication Standard [29 CFR 1910.1200]. Containers of dimethylamine should be protected from physical damage and ignition sources, and should be stored separately from oxidizing materials, acrylaldehyde, fl uorine, maleic anhydride, chlorine, and mercury. Outside or detached storage is preferred. If stored inside, a standard flammable liquids cabinet or room should be used. Ground and bond metal containers and equipment when transferring liquids. Empty containers of dimethylamine should be handled appropriately.
Precautions During handling of dimethylamine, workers should use proper fume hoods, personal protective clothing and equipment, avoid skin contact, and use gloves, sleeves, and encapsulating suits. Dimethylamine is extremely flammable and may be ignited by heat, sparks, or open flames. Liquid dimethylamine will attack some forms of plastic, rubber, and coatings and is flammable. The vapors of dimethylamine are an explosion and poison hazard. Containers of dimethylamine may explode in the heat of a fi re and require proper disposal. Workers should use dimethylamine with adequate ventilation and containers must be kept properly closed.
Safety Profile
Poison by ingestion. Moderately toxic by inhalation and intravenous routes. Mutation data reported. An eye irritant. Corrosive to the eyes, skin, and mucous membranes. A flammable gas. When heated to decomposition it emits toxic fumes of Nx,. Incompatible with acrylddehyde, fluorine, and maleic anhydride
Hazardous Substances Data 124-40-3(Hazardous Substances Data)
Toxicity
Acute oral LD50 for guinea pigs 340 mg/kg, mice 316 mg/kg, rats 698 mg/kg, rabbits 240 mg/kg (quoted, RTECS, 1985).
IDLA 500 ppm

Hazard Information

Material Safety Data Sheet(MSDS)

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