CAS Number: 95-63-6

Also known as: Pseudocumene, Trimethyl-1,2,4 Benzene, Trimethylbenzene, 1,2,4-Trimethylbenzene, 1,2,4-Trimethyl Benzene
Information on chemical

Information on chemical

External resources

CAMEO Chemical Database
WISER Substance List


CAS number 95-63-6
Formula C9H12

Physical chemical data

Physical State (20°C) Liquid
Physical State (25°C) Liquid
Density (kg/m3)
881 [Kg/m³] at a temperature of 20°C
Kinematic viscosity (cSt)
0.843 [cSt] at a temperature of 20°C
Molar mass (g/mol) 120.19
Density of gas (kg/m3) 5.35
Solubility (g/L)
60 [g/L] at a temperature of 20°C and salinity of 0‰
42 [g/L] at a temperature of 25°C and salinity of 0‰
40 [g/L] at a temperature of 25°C and salinity of 34.5‰
Boiling Point (°C) 165.2
Melting Point (°C) -80.8
Critical temperature (°C) 649.1
Critical pressure (Pa) 3232000
Surface tension (mN/m)
29.2 [mN/m] at a temperature of 25°C
Ignition Temperature (°C) 440
Flash Point (°C) 39
Flash Point (Pensky-Martens closed cup) (°C) 44
Lower explosivity limit (LEL) (volume %) 0.9
Upper explosivity limit (UEL) (volume %) 6.4
Vapor enthalpy (J/Kg)
398785 [J/Kg] at a temperature of 25°C
Combus enthalpy (J/Kg) 41000000
Specific heat capacity (J/(Kg·K)) 1789
Combustion efficiency (%) 70
Mass flow rate of the combustion surface (Kg/(m²·s)) 0.06
Rad fraction (%) 30
Henry's constant (mol/(m³·Pa)) 624.162

Behaviour at sea

Log kow 3.78
Log koc 3.33
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) 152

Additional data

Colour colourless
Odour pleasant
MARPOL pollution category
Category Description
X Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a major hazard to either marine resources or human health and, therefore, justify the prohibition of the discharge into the marine environment.

Transportation data

Cargo group 32
State liquid
Temperature (°C) ambient
Family name aromatic hydrocarbons

Reactivity data

Water No
Acid(s) Yes
Oxidizing agents Yes

GESAMP Hazard profile

Bioaccumulation in logPow (A1A) 3 - ≥3 and <4
Bioaccumulation (A1) 3 - Moderate potential to bioaccumulate
Acute aquatic toxicity (B1) (LC/EC/IC50 (mg/l)) 3 - Moderately toxic
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)) 0 - Negligible
Skin irritation/corrosivity (D1) 2 - Irritating
Eye irritation/corrosivity (D2) 2 - Irritating
Interference with coastal amenities (E2) F - Floating substance, not likely to evaporate or to dissolve quickly
Effects on wildlife and bottom habitats (E3) 2 - Is a persistent floater; and/or is moderately acutely toxic; and/or is irritating to skin and/or eyes; and/or has long-term health effects other than carcinogenicity, mutagenicity or reprotoxicity; and/or is highly flammable; and/or is flammable and is a floater with evaporative properties

Human toxicity threshold

Environmental Hazard Flammable Harmful
Hazard statements
H226 Flammable liquid and vapour.
H315 Causes skin irritation.
H319 Causes serious eye irritation.
H332 Harmful if inhaled.
H335 May cause respiratory irritation.
H411 Toxic to aquatic life with long lasting effects.
Precautionary statements
P210 Keep away from heat/sparks/open flames/hot surfaces. No smoking.
P243 Take precautionary measures against static discharge.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P301 + P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P302 + P352 IF ON SKIN: Wash with plenty of soap and water.
TEEL-1 (mg/m3) 500
TEEL-2 (mg/m3) 500
TEEL-3 (mg/m3) 500


Lowest median lethal concentration (LC50) on crustacean (mg/l) 4.35
Lowest median lethal concentration (LC50) on fishes (mg/l) 7.72
Assessment factor (AF)
1 on the Short term
Predicted No Effect Concentration (PNEC) (µg/l)
120 [µg/l] on the Short 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 2020-12-11T09:57:21+00:00

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