HNS Details

1,2,4-Trimethylbenzene

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Description Top

CAS number 95-63-6
Chemical formula C9H12
Standard European Behaviour Classification (SEBC) Floater that evaporates (FE)
GESAMP Hazard profile
A1 A2 B1 B2 C1 C2 C3 D1 D2 D3 E1 E2 E3
3 NR 4 0 0 0 1 2 1 None NI FE 2
Marine pollution Classification (MARPOL Annex II)
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.
Alternate names for this chemical
1,2,4-Trimethylbenzene
1,2,4-Trimethyl Benzene
Pseudocumene
Trimethyl-1,2,4 Benzene
Trimethylbenzene

Physico-chemical properties Top

Chemical formula C9H12
Molar mass 120.19 [g/mol]
Physical state
Liquid at a temperature of 25 [°C] and at a pressure of 101325 [Pa]
Melting point -60.5 [°C]
Boiling point 169.5 [°C] at a pressure of 101325 [Pa]
Critical temperature 649.1 [°C]
Density
880 [kg/m³] at a temperature of 20 [°C]
Surface tension
29.2 [mN/m] at a temperature of 25 [°C]
Kinematic viscosity
0.843 [cSt] at a temperature of 20 [°C]
Water solubility
60 [mg/l] at a temperature of 20 [°C] and at a salinity of 0 [‰]
42 [mg/l] at a temperature of 25 [°C] and at a salinity of 0 [‰]
40 [mg/l] at a temperature of 25 [°C] and at a salinity of 34.5 [‰]
Vapour pressure
133.32 [Pa] at a temperature of 20 [°C]
256 [Pa] at a temperature of 25 [°C]
Critical pressure 3232000 [Pa]
Vapour density 3.4
Flash point (Pensky-Martens closed cup) 44 [°C]
Lower explosive limit (LEL) 0.9 [% in volume]
Upper explosive limit (UEL) 6.4 [% in volume]
Vaporization enthalpy
398785 [J/kg] at a temperature of 25 [°C]
Combustion enthalpy 41000000 [J/kg]
Specific heat capacity 1789 [J/(kg·K)] at a temperature of 25 [°C]
Combustion efficiency 70 [%]
Mass flow rate of the combustion surface 0.06 [kg/(m²·s)]
Radiative fraction 30 [%]
Henry's constant 624.162 [mol/(m³·Pa)]

Behaviour at sea Top

Log Kow 3.78000000
Log Koc 3.33000000
Hydrolysis (Half-life period) Not hydrolysable
Aqueous photolysis (Half-life period) Not photolysable
Biodegradation in estuary environment (Half-life period) 10 [days]
Biodegradation in marine environment (Half-life period) 10 [days]
Standard European Behaviour Classification (SEBC) Floater that evaporates (FE)
Bioconcentration factor (BCF) 152.00000000

Ecotoxicity Top

Lowest median lethal concentration (LC50) on crustacean 4.35 [mg/l]
Lowest median lethal concentration (LC50) on fishes 7.72 [mg/l]
Assessment factor (AF)
1 on the short term
Predicted No Effect Concentration (PNEC)
120 [µg/l] on the short term

Hazards Top

Flammable
Harmful
Environmental Hazard

Warning

IDLH
Hazards statements
Physical
H226
Flammable liquid and vapour.
Health
H315
Causes skin irritation.
H319
Causes serious eye irritation.
H332
Harmful if inhaled.
H335
May cause respiratory irritation.
Environmental
H411
Toxic to aquatic life with long lasting effects.
Precautionary statements
Prevention
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.
Response
P301 + P310
IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P302 + P352
IF ON SKIN: Wash with plenty of soap and water.

GESAMP Top

GESAMP Hazard profile
A1 A2 B1 B2 C1 C2 C3 D1 D2 D3 E1 E2 E3
3 NR 4 0 0 0 1 2 1 None NI FE 2
A1: Bioaccumulation
Rating Description
3 Moderate potential to bioaccumulate
A1a: None
Rating Description Criteria [mg/l]
3 Moderate potential to bioaccumulate 3 ≤ Log Kow < 4
A1b: None
Rating Description Criteria
3 Moderate potential to bioaccumulate 100 ≤ BCF < 500
A2: Biodegradation
Rating Description
NR Not readily biodegradable
B1: Acute aquatic toxicity
Rating Description Criteria [mg/l]
4 Highly toxic 0.1 < LC/EC/IC50 ≤ 1
B2: Chronic aquatic toxicity
Rating Description Criteria [mg/l]
0 Negligible NOEC > 1
C1: Acute oral toxicity
Rating Description Criteria [mg/Kg]
0 Negligible AOTE > 2000
C2: Acute dermal toxicity (skin contact)
Rating Description Criteria [mg/Kg]
0 Negligible ADTE > 2000
C3: Acute inhalation toxicity
Rating Description Criteria [mg/l] (4 hours exposure)
1 Slight 10 < AITE ≤ 20
D1: Skin irritation or corrosion
Rating Description Sign GHS category
2 Irritating Marked erythema
Obvious and marked oedema
Other signs of local injury		 Irritant Category 2
D2: Eye irritation
Rating Description Sign GHS category
1 Mildly irritating Mild conjunctival hyperaemia with or without chemosis, reversible within 7 days Irritant Category 2B
D3: Long-term health effects
Notation Hazard endpoint Description GHS category
None None No Information None
E1: Tainting of seafood
Rating Description
NI No Information
E2: Behaviour of chemicals in the marine environment
Rating Description
FE Floater that evaporates
E3: Interference with the use of coastal amenities
Rating Interference Description Interpretation Warning
2 Moderately objectionable 1)
is a persistent floater

and/or 2)
is moderately acutely toxic

and/or 3)
is irritating to skin and/or eyes

and/or 4)
has long-term health effects other than carcinogenicity, mutagenicity or reprotoxicity

and/or 5)
is highly flammable

and/or 6)
is moderately flammable and is a floater with evaporative properties		 1)
E2 = Fp

and/or 2)
C1 and/or C2 and/or C3 = 23

and/or 3)
D1 and/or D2 = 2

and/or 4)
D3 contains Ss, Sr, T, A, N, or I

and/or 5)
Flashpoint <23°C

and/or 6)
Flashpoint 23°C to 60°C and E2 = FE or FED		 Warning issued and possible closure of amenities
GHS Security Information
Flammable
Harmful
Environmental Hazard

Warning


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