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67-56-1

Name Methanol
CAS 67-56-1
EINECS(EC#) 200-659-6
Molecular Formula CH4O
MDL Number MFCD00002425
Molecular Weight 32.04
MOL File 67-56-1.mol

Chemical Properties

Appearance Methyl alcohol is a colorless, volatile liquid with a mild odor.
Melting point  -98 °C(lit.)
Boiling point  65.4 °C(lit.)
density  0.791 g/mL at 25 °C
vapor density  1.11 (vs air)
vapor pressure  410 mm Hg ( 50 °C)
refractive index  n20/D 1.329(lit.)
Fp  52 °F
storage temp.  Store at RT.
solubility  benzene: miscible(lit.)
form  Liquid Free From Particulates
pka 15.2(at 25℃)
color  <10(APHA)
Specific Gravity 0.793 (20/20℃)
Odor Faint alcohol odor detectable at 4 to 6000 ppm (mean = 160 ppm)
Relative polarity 0.762
explosive limit 5.5-44%(V)
Odor Threshold 33ppm
Water Solubility  miscible
λmax λ: 210 nm Amax: 0.50
λ: 220 nm Amax: 0.30
λ: 230 nm Amax: 0.15
λ: 235 nm Amax: 0.10
λ: 240 nm Amax: 0.05
λ: 260 nm Amax: 0.01
λ: 400 nm Amax: 0.01
Detection Methods GC
Merck  14,5957
BRN  1098229
Henry's Law Constant 4.99 at 25 °C (headspace-GC, Gupta et al., 2000)
Dielectric constant 33.6(20℃)
Exposure limits TLV-TWA (200 ppm) (ACGIH), 260mg/m3, 1040mg/m3 (800 ppm) 15minutes (NIOSH); STEL 310mg/m3 (250 ppm); IDLH 25,000 ppm (NIOSH).
LogP -0.770
CAS DataBase Reference 67-56-1(CAS DataBase Reference)
NIST Chemistry Reference Methyl alcohol(67-56-1)
Storage Precautions Moisture sensitive
EPA Substance Registry System 67-56-1(EPA Substance)

Safety Data

Hazard Codes  Xn,T,F
Risk Statements 
R10:Flammable.
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed .
R68/20/21/22:Harmful: possible risk of irreversible effects through inhalation, in contact with skin and if swallowed .
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 .
R11:Highly Flammable.
R40:Limited evidence of a carcinogenic effect.
R36:Irritating to the eyes.
R36/38:Irritating to eyes and skin .
R23/25:Toxic by inhalation and if swallowed .
Safety Statements 
S36/37:Wear suitable protective clothing and gloves .
S7:Keep container tightly closed .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S16:Keep away from sources of ignition-No smoking .
S24/25:Avoid contact with skin and eyes .
S23:Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer) .
S24:Avoid contact with skin .
RIDADR  UN 1170 3/PG 2
WGK Germany  1
RTECS  PC1400000
3-10
Autoignition Temperature 385 °C
TSCA  Yes
HazardClass  3
PackingGroup  II
HS Code  29051100
Safety Profile
A human poison by ingestion. Poison experimentally by skin contact. Moderately toxic experimentally by intravenous and intraperitoneal routes. Mildly toxic by inhalation. Human systemic effects: changes in circulation, cough, dyspnea, headache, lachrymation, nausea or vomiting, optic nerve neuropathy, respiratory effects, visual field changes. An experimental teratogen. Experimental reproductive effects. An eye and skin irritant. Human mutation data reported. A narcotic. Its main toxic effect is exerted upon the nervous system, particularly the optic nerves and possibly the retinae. The condtion can progress to permanent blindness. Once absorbed, methanol is only very slowly eliminated. Coma resulting from massive exposures may last as long as 2-4 days. In the body, the products formed by its oxidation are formaldehyde and formic acid, both of which are toxic. Because of the slow elimination, methanol should be regarded as a cumulative poison. Though single exposures to fumes may cause no harmful effect, daily exposure may result in the accumulation of sufficient methanol in the body to cause illness. Death from ingestion of less than 30 mL has been reported. A common air contaminant. Flammable liquid. Dangerous fire hazard when exposed to heat, flame, or oxidlzers. Explosive in the form of vapor when exposed to heat or flame. Explosive reaction with chloroform + sodium methoxide, diethyl zinc. Violent reaction with alkyl aluminum salts, acetyl bromide, chloroform + sodlum hydroxide, CrO3, cyanuric chloride, (I + ethanol + HgO), Pb(ClO4)2, HClO4, P2O3, (KOH + CHCb), nitric acid. Incompatible with berylhum dihydride, metals (e.g., potassium, magnesium), oxidants (e.g., barium perchlorate, bromine, sodium hypochlorite, chlorine, hydrogen peroxide), potassium tert-butoxide, carbon tetrachloride + metals (e.g., aluminum, magnesium, zinc), dlchloromethane. Dangerous; can react vigorously with oxidizing materials. To fight fire, use alcohol foam. When heated to decomposition it emits acrid smoke and irritating fumes.
Hazardous Substances Data 67-56-1(Hazardous Substances Data)
Toxicity
LD50 oral (rat)
5628 mg/kg
LD50 skin (rabbit)
15,840 mg/kg
LC50 inhal (rat)
>145,000 ppm (1 h)
PEL (OSHA)
200 ppm (260 mg/m3)
TLV-TWA (ACGIH)
200 ppm (260 mg/m3)—skin
STEL (ACGIH)
250 ppm (328 mg/m3)
IDLA 6,000 ppm

Hazard Information

Material Safety Data Sheet(MSDS)

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