CAS Number: 57-55-6

Also known as: 1,2-DIHYDROXYPROPANE, 2-Hydroxypropanol, 1,2-Propanediol, Alpha-Propylene Glycol, Monopropylene Glycol, Methylethylene Glycol, Methyl Glycol, Propylene Glycol, Pg 12, Propane-1,2-Diol, Propanediol, Methylethyl Glycol, 1,2-Propylene Glycol, α-Propylene Glycol
Information on chemical

Information on chemical

External resources

CAMEO Chemical Database
WISER Substance List


CAS number 57-55-6
Formula C3H8O2

Physical chemical data

Physical State (20°C) Liquid
Physical State (25°C) Liquid
Density (kg/m3)
1040 [Kg/m³] at a temperature of 20°C
Kinematic viscosity (cSt)
54.05 [cSt] at a temperature of 20°C
39 [cSt] at a temperature of 25°C
Molar mass (g/mol) 76.09
Density of gas (kg/m3) 3.39
Solubility (g/L)
1040000 [g/L] at a temperature of 20°C and salinity of 0‰
1040000 [g/L] at a temperature of 25°C and salinity of 0‰
Boiling Point (°C) 187
Melting Point (°C) -59
Critical temperature (°C) 676.4
Critical pressure (Pa) 5941000
Surface tension (mN/m)
38 [mN/m] at a temperature of 20°C
36.51 [mN/m] at a temperature of 25°C
Vapour Pressure (Pa)
10.4 [Pa] at a temperature of 20°C
17 [Pa] at a temperature of 25°C
Ignition Temperature (°C) 420
Flash Point (°C) 99
Flash Point (Pensky-Martens closed cup) (°C) 99
Flash Point (Cleveland open cup) (°C) 107.2
Lower explosivity limit (LEL) (volume %) 2.5
Upper explosivity limit (UEL) (volume %) 12.6
Vapor enthalpy (J/Kg)
688000 [J/Kg] at a temperature of 187.6°C
486366 [J/Kg] at a temperature of 25°C
Combus enthalpy (J/Kg) 21700000
Specific heat capacity (J/(Kg·K)) 2507.55
Combustion efficiency (%) 99
Mass flow rate of the combustion surface (Kg/(m²·s)) 0.02
Rad fraction (%) 28
Henry's constant (mol/(m³·Pa)) 0.01

Behaviour at sea

Log kow -0.92
Log koc 0.65
Aqueous photolysis (Half-life) Not photolysable
Biodegradation in estuary environment (Half-life) (days) Not hydrolysable
Biodegradation in marine environment (Half-life) (days) 10
Bioconcentration factor (BCF) 1

Additional data

Colour colourless
Odour odourless
MARPOL pollution category
Category Description
Z Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a minor hazard to either marine resources or human health and therefore justify less stringent restrictions on the quality and quantity of the discharge into the marine environment.

Transportation data

Cargo group 20
State liquid
Temperature (°C) ambient
Family name alcohols, glycols

Reactivity data

Water No
Abilities Miscible in water..
Acid(s) Yes
Base(s) Yes
Metal(s) and alloys Yes (light metals)
Oxidizing agents Yes
Organic substance Yes

GESAMP Hazard profile

Bioaccumulation in logPow (A1A) 0 - e <1, or > ca.7, or Mol. Wt. > 1000
Bioaccumulation (A1) 0 - No potential to bioaccumulate
Biodegradation (A2) R - Readily biodegradable
Acute aquatic toxicity (B1) (LC/EC/IC50 (mg/l)) 0 - Non-toxic
Chronic aquatic toxicity (B2) (NOEC (mg/l)) 0 - Negligible
Acute mammalian toxicity by swallowing (C1) (LD50 (mg/kg)) 0 - Negligible
Acute mammalian toxicity by skin penetration (C2) (LD50 (mg/kg)) 0 - Negligible
Acute mammalian toxicity by inhalation (C3) (LC50 (mg/l)) 1 - Slight
Skin irritation/corrosivity (D1) 1 - Mildly irritating
Eye irritation/corrosivity (D2) 1 - Mildly irritating
Interference with coastal amenities (E2) D - Dissolver
Effects on wildlife and bottom habitats (E3) 1 - Is a floater; and/or is slightly acutely toxic; and/or is mildly irritant to skin and/or eyes

Human toxicity threshold

TEEL-1 (mg/m3) 10
TEEL-2 (mg/m3) 10
TEEL-3 (mg/m3) 500


Lowest median lethal concentration (LC50) on algae (mg/l) 19000
Lowest median lethal concentration (LC50) on crustacean (mg/l) 18340
Lowest median lethal concentration (LC50) on fishes (mg/l) 46500
Highest no observed effect concentration (NOEC) on algae (mg/l) > 5300
Assessment factor (AF)
1000 on the Short term
10000 on the Long term
Predicted No Effect Concentration (PNEC) (µg/l)
18340 [µg/l] on the Short term
1834 [µg/l] on the Long term
Incident reports

Incident reports

No incident reports available

Emergency Response Guidebook

Emergency Response Guidebook

No guides available

At sea emergency guide

At sea emergency guide

No guides available

Decision trees

Decision trees

No decision trees available

No additional data

last modified 2020-12-11T09:57:24+00:00

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